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Available via license: CC BY 4.0
Content may be subject to copyright.
Thermal energy storage (TES) technology for
active and passive cooling in buildings: A
Review
Nursyazwani Abdul Aziz
1
, Nasrul Amri Mohd Amin
1, *
, Mohd Shukry Abd Majid
1
, and
Izzudin Zaman
2
1
School of Mechatronic Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia.
2
Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Parit
Raja, 86400 Batu Pahat, Johor, Malaysia.
Abstract. Thermal energy storage (TES) system is one of the outstanding
technologies available contributes for achieving sustainable energy demand.
The energy storage system has been proven capable of narrowing down the
energy mismatch between energy supply and demand. The thermal energy
storage (TES) - buildings integration is expected to minimize the energy
demand shortage and also offers for better energy management in building
sector. This paper presents a state of art of the active and passive TES
technologies integrated in the building sector. The integration method,
advantages and disadvantages of both techniques were discussed. The TES
for low energy building is inevitably needed. This study prescribes that the
integration of TES system for both active and passive cooling techniques are
proven to be beneficial towards a better energy management in buildings.
1 Introduction
The global concern towards the energy crisis has become a major flashpoint in recent years.
The worldwide energy demands have increase precipitously in past decades and presumed to
be continually rising [1]. The foreseen significance growth of the energy demand is induced
by climatic change and economy development is further amplified by the expected increase
of the local population [2]. Although the current energy source has proved to meet the
demand by far, this fossil-based energy source is anticipated to be depleted.
In order to counterbalance the impact of climatic change, population growth, economy
development, and the rising of global energy demand, the efficient thermal management is
vital. In fact, this scenario indicates the urgencies for an alternative source yet reducing the
overdependence on fossil fuels. Amongst all the demands, buildings account for 40% of the
total energy consumptions [3]. A part of that, heating, ventilating and air conditioning
(HVAC) systems are recorded to consume 60% of the energy in buildings. [3, 4]. For the last
forty years, the demand of the building sector is seen to comply an increasing trend of 1.8%
annually [4]. It is forecasted to exceed 180 exajoules (EJ) by the middle of this century, in
case of the situation is uncontrollable. [5].
*
Corresponding author: nasrulamri.mohdamin@unimap.edu.my
© The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons
Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
Remarkable efforts have been made by years, aiming to alleviate the energy efficiency
and to minimize the energy consumption. The concept of energy efficiency in building
sectors is related to the energy supply that benefit the end users [5]. The best alternative to
reduce energy cost in buildings is with the incorporated of suitable heating and cooling design
[6]. Cooling strategies in building can be categorized into three; active, passive and hybrid
cooling. Active cooling strategy encompass all conventional HVACs, whereas the passive
strategy is attributed to the utilization of natural energy resources, available from the
environment despite consumes the conventional energy means [7].
The introduction of mechanical refrigeration systems in building sector has increase the
likelihood of achieving a better thermal comfort for a longer period. The flexibility of this
system has provide good assistance and led to the change of the life styles and work habits.
Nonetheless, due to the current energy crisis, passive cooling technique has been
recommended as one of the suitable techniques since it is environmentally-harmless [8].
Thermal energy storage (TES) is acknowledged as the viable solution to achieve the
efficient thermal management in buildings [9]. Sustainable cooling system with TES in
buildings can be accomplished through passive systems and active systems [10]. This paper
briefly discusses the active and passive TES technology integrated with the building sector,
as well as the suitable integration method for desired application.
2 Thermal Energy Storage (TES)
Thermal energy storage (TES) system has received extensive attention from researchers for
its ability in eliminating environmental problems. The capability of TES in bridging the gap
between the supply and demands of energy [11] can increase the efficiency of energy
consumption. TES is defined as the temporary holder of thermal energy in the form of hot or
cold substances for later utilization [12]. Moreover, TES system also leads to a better
economic feasibility, reducing the investment and running cost, respectively. Furthermore, it
is believed to release less CO2 emission, thereby reducing the level of environmental
pollution [10]. In recent years, TES system has been proven as a promising method that is
utilized in various applications such as space and water heating, cooling and air-conditioning
[13].
Thermal energy can be stored by three methods; sensible heat, latent heat and
thermochemical energy storage. Sensible heat storage (SHS) is the most common way of
energy storage which storage process can be sensed by the change in temperature of the
medium [14]. The energy storage density in SHS is determined by the value of its specific
heat capacity and also the temperature changes based on designed application [10].
Meanwhile, the latent heat storage (LHS) is referred to the heat stored during a phase change
process, is then calculated from the enthalpy difference ∆H between the solid and liquid
phase [16].
Latent heat storage using PCMs is reported to be more efficient compared to the sensible
energy storage because it provides higher heat storage capacity and more isothermal behavior
during charging and discharging [17]. PCMs can be defined as a substance that is capable of
storing thermal energy in the form of latent heat [18]. PCMs release and absorb an amount
of energy in the form of latent heat at a relatively constant temperature during the solidifying
and melting process respectively. The investigation on PCMs to store solar heat for space
heating is recorded as the earliest investigation on TES systems for heating and cooling in
building which is conducted in early 1930s. Nevertheless, the earliest system is not
economical [19]. Further on, the research and development (R&D) on this technology
continuously improved by years. Another TES system is thermo chemical energy storage.
The storage densities of this method is proclaimed to be similar to PCMs. Nonetheless, this
method is reported to be more complex than SHS and LHS [20].
3 TES technology for buildings
The integration method of TES system can be classified as active or passive system [21].
There are also some applications that adopting the hybrid of active and passive cooling
system. Theoretically, with respect to the heat transfer fluid (HTF) being actively or not,
thermal storage also can be classified into 'active' or 'passive' storage types [10]. Referring to
Mehling and Cabeza [10], an 'active' storage system is mainly characterized by forced
convection heat transfer, and mass transfer in some cases. Meanwhile, in the case of free or
no convection occurred in TES, the storage system is denoted as ‘passive' [10]. Implicitly,
passive cooling with TES can be described as a technique to cool a system without external
energy resource. Whereas, active cooling strategy covers all the thermal storage being
integrated to the conventional HVAC systems [22]. Table 1 presents the storage type of TES.
Table 1. Storage types [10].
Notation with respect to the method
of heat transfer
Notation with respect to the HTF
being (actively moved or not)
Storage with heat transfer on the
storage surface
Insulated environment
passive/active
No insulation and good thermal
contact between storage and demand
passive/active
Storage with heat transfer on
internal heat transfer surfaces
Heat exchanger type
active
Direct contact type
active
Module type
active
Storages with heat transfer by
exchanging the heat storage
medium
Slurry type
active
Sensible liquid type
active
3.1 Active Cooling
An active cooling system is mainly characterized by forced convection heat transfer [10]. In
general, the purpose of active TES integration in buildings is to cater for free cooling.
Besides, for several applications such as HVAC systems and domestic hot water application,
TES system is been utilized for peak shaving purpose [23,24,25]. Some of the suitable TES
integration in the building is illustrated in Figure 1. It involves the integration to the core of
the building, suspended ceilings, external solar facades, Photovoltaic (PV) system,
ventilation system, and water tank as thermal storage [26].
Similar to the passive cooling, building thermal inertia is commonly incorporated to
improve the thermal performance of the construction systems such as floors, ceiling and
walls. As stated above, the difference is; for active storage, HTF is actively moved through
the system and the forced convection occurred.
Yamaha and Misaki [27] studied the air distribution system integrated with a PCM thermal
storage for peak shaving purpose. PCMs mixtures of paraffin waxes with the heat of fusion around
90 KJ/kg was chosen as thermal storage medium. During the charging period of 5 am to 8 am, the
heat transfer fluid (air) is blown from the air conditioner (AC), then it will pass through PCM
thermal storage and return back to the AC, creating a closed loop as shown in Figure 2. The
charging operation then took over 4 hours (9 am to 1 pm) with the ordinary air conditioning
2
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
Remarkable efforts have been made by years, aiming to alleviate the energy efficiency
and to minimize the energy consumption. The concept of energy efficiency in building
sectors is related to the energy supply that benefit the end users [5]. The best alternative to
reduce energy cost in buildings is with the incorporated of suitable heating and cooling design
[6]. Cooling strategies in building can be categorized into three; active, passive and hybrid
cooling. Active cooling strategy encompass all conventional HVACs, whereas the passive
strategy is attributed to the utilization of natural energy resources, available from the
environment despite consumes the conventional energy means [7].
The introduction of mechanical refrigeration systems in building sector has increase the
likelihood of achieving a better thermal comfort for a longer period. The flexibility of this
system has provide good assistance and led to the change of the life styles and work habits.
Nonetheless, due to the current energy crisis, passive cooling technique has been
recommended as one of the suitable techniques since it is environmentally-harmless [8].
Thermal energy storage (TES) is acknowledged as the viable solution to achieve the
efficient thermal management in buildings [9]. Sustainable cooling system with TES in
buildings can be accomplished through passive systems and active systems [10]. This paper
briefly discusses the active and passive TES technology integrated with the building sector,
as well as the suitable integration method for desired application.
2 Thermal Energy Storage (TES)
Thermal energy storage (TES) system has received extensive attention from researchers for
its ability in eliminating environmental problems. The capability of TES in bridging the gap
between the supply and demands of energy [11] can increase the efficiency of energy
consumption. TES is defined as the temporary holder of thermal energy in the form of hot or
cold substances for later utilization [12]. Moreover, TES system also leads to a better
economic feasibility, reducing the investment and running cost, respectively. Furthermore, it
is believed to release less CO2 emission, thereby reducing the level of environmental
pollution [10]. In recent years, TES system has been proven as a promising method that is
utilized in various applications such as space and water heating, cooling and air-conditioning
[13].
Thermal energy can be stored by three methods; sensible heat, latent heat and
thermochemical energy storage. Sensible heat storage (SHS) is the most common way of
energy storage which storage process can be sensed by the change in temperature of the
medium [14]. The energy storage density in SHS is determined by the value of its specific
heat capacity and also the temperature changes based on designed application [10].
Meanwhile, the latent heat storage (LHS) is referred to the heat stored during a phase change
process, is then calculated from the enthalpy difference ∆H between the solid and liquid
phase [16].
Latent heat storage using PCMs is reported to be more efficient compared to the sensible
energy storage because it provides higher heat storage capacity and more isothermal behavior
during charging and discharging [17]. PCMs can be defined as a substance that is capable of
storing thermal energy in the form of latent heat [18]. PCMs release and absorb an amount
of energy in the form of latent heat at a relatively constant temperature during the solidifying
and melting process respectively. The investigation on PCMs to store solar heat for space
heating is recorded as the earliest investigation on TES systems for heating and cooling in
building which is conducted in early 1930s. Nevertheless, the earliest system is not
economical [19]. Further on, the research and development (R&D) on this technology
continuously improved by years. Another TES system is thermo chemical energy storage.
The storage densities of this method is proclaimed to be similar to PCMs. Nonetheless, this
method is reported to be more complex than SHS and LHS [20].
3 TES technology for buildings
The integration method of TES system can be classified as active or passive system [21].
There are also some applications that adopting the hybrid of active and passive cooling
system. Theoretically, with respect to the heat transfer fluid (HTF) being actively or not,
thermal storage also can be classified into 'active' or 'passive' storage types [10]. Referring to
Mehling and Cabeza [10], an 'active' storage system is mainly characterized by forced
convection heat transfer, and mass transfer in some cases. Meanwhile, in the case of free or
no convection occurred in TES, the storage system is denoted as ‘passive' [10]. Implicitly,
passive cooling with TES can be described as a technique to cool a system without external
energy resource. Whereas, active cooling strategy covers all the thermal storage being
integrated to the conventional HVAC systems [22]. Table 1 presents the storage type of TES.
Table 1. Storage types [10].
Notation with respect to the method
of heat transfer
Notation with respect to the HTF
being (actively moved or not)
Storage with heat transfer on the
storage surface
Insulated environment
passive/active
No insulation and good thermal
contact between storage and demand
passive/active
Storage with heat transfer on
internal heat transfer surfaces
Heat exchanger type
active
Direct contact type
active
Module type
active
Storages with heat transfer by
exchanging the heat storage
medium
Slurry type
active
Sensible liquid type
active
3.1 Active Cooling
An active cooling system is mainly characterized by forced convection heat transfer [10]. In
general, the purpose of active TES integration in buildings is to cater for free cooling.
Besides, for several applications such as HVAC systems and domestic hot water application,
TES system is been utilized for peak shaving purpose [23,24,25]. Some of the suitable TES
integration in the building is illustrated in Figure 1. It involves the integration to the core of
the building, suspended ceilings, external solar facades, Photovoltaic (PV) system,
ventilation system, and water tank as thermal storage [26].
Similar to the passive cooling, building thermal inertia is commonly incorporated to
improve the thermal performance of the construction systems such as floors, ceiling and
walls. As stated above, the difference is; for active storage, HTF is actively moved through
the system and the forced convection occurred.
Yamaha and Misaki [27] studied the air distribution system integrated with a PCM thermal
storage for peak shaving purpose. PCMs mixtures of paraffin waxes with the heat of fusion around
90 KJ/kg was chosen as thermal storage medium. During the charging period of 5 am to 8 am, the
heat transfer fluid (air) is blown from the air conditioner (AC), then it will pass through PCM
thermal storage and return back to the AC, creating a closed loop as shown in Figure 2. The
charging operation then took over 4 hours (9 am to 1 pm) with the ordinary air conditioning
3
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
process occurred. The operation then followed by discharging process from 1 pm to 4 pm where
air is blown via the PCM storage tank to the room. The result reveals that the incorporated of
400kg PCMs is applicable to sustain a constant room temperature in 73.8m
2
room surface of an
ordinary office building, without any cool source. This study concedes that the utilization of PCM
could improve overall energy management in buildings.
Fig. 1. Active cooling TES integration in building [26].
On the other hand, Kondo and Ibamoto [28] studies the feasibility of the utilization of
PCM ceiling boards with the aim to minimize energy consumption during the peak time. The
thermal capacity of PCM ceiling board was measured by using a small chamber,
approximately 16m
2
surface area. The PCM ceiling boards was developed by adding the
microencapsulated PCM to the commonly used rock wool ceiling board. The mixture of n-
paraffins with a melting point of 25ºC was used in this study.
During overnight, the cool air from air handling unit (AHU) will flow into the ceiling
chamber space and cools the PCM ceiling board, storing the cool thermal energy. During the
peak shaving period, the air from the room returns to the AHU through the ceiling chamber
space. The warm air returning from the room is cooled down when passing through the cool
PCM ceiling board, before entering the AHU unit. As a result, the maximum thermal load is
recorded to decrease by 14.8%. Besides, the utilization of PCM ceiling boards is reported to
lower the electricity cost for 91.6% compared to the use of conventional rock wool ceiling
board. This study concludes that the utilization of PCM ceiling system is effective for peak
shaving control [28].
Zhou et al. [29] proposed the commonly used of variable air volume air-conditioning
(VAV-AC) to be enhanced by attaching the shape stabilized phase change material (SSPCM)
plates to the inner surfaces of all external walls. The proposed SSPCM is a high-density
polyethylene (HDPE) and paraffin. The melting
temperature and heat of fusion of proposed
PCMs is 23ºC and 160 kJ/kg respectively. The result shows that the building peak load and
electricity cost could be reduced for over 20% and 11% respectively.
3.2 Passive Cooling
The principle aim of passive cooling is to maximize the comfort and health of building
tenants and minimizing the energy demand, simultaneously. Passive TES has been proven to
effectively improve the comfort conditions while minimizing the needs of mechanically
heating or cooling systems [30]. This strategy removes heat from the building and prevents
any heat gain from the surroundings [31].
In general, the flow of energy in passive design is based on natural means, radiation,
conduction, convection without the use of mechanical devices to dissipate heat. It utilizes on-
site energy, accessible from natural environment, together with the architectural design of
building components [32]. Passive cooling requires a good natural resources as a heat sinks.
For instance, onsite heat sinks are soil, night sky (environment) or wind. The example of
recent passive systems includes thermal mass [33], solar heating and night ventilation
technique [33], shading effect using blinds [34], use of ventilation facades and coated glazing
elements [35].
In Dubai, United Arab Emirates (UAE), passive cooling strategies were investigated. An
energy simulation software, Integrated Environmental Solutions (IES) was used to simulate the
cooling performance of the buildings. This study proposed eight passive cooling strategies (Figure
3). For instance, the utilization of double glazing and good shading devices are proposed to
minimize the heat gain. These strategies has been proven that it could attain the reduction of
energy consumption. Green roofing method was also verified as an effective roof insulation. The
passive cooling strategy shows a remarkable finding of 23.6% total annual energy consumptions
[30].
Fig. 2. Set up for PCM storage tank integrated with air conditioning system [26].
Fig. 3. Passive cooling strategies [30].
3.2.1 Material candidates for passive cooling storage
Typical heat sinks alternative used in buildings are high thermal mass materials such as stone,
concrete, or alveolar bricks [36]. Standard solar walls and solar water walls are the example
4
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
process occurred. The operation then followed by discharging process from 1 pm to 4 pm where
air is blown via the PCM storage tank to the room. The result reveals that the incorporated of
400kg PCMs is applicable to sustain a constant room temperature in 73.8m
2
room surface of an
ordinary office building, without any cool source. This study concedes that the utilization of PCM
could improve overall energy management in buildings.
Fig. 1. Active cooling TES integration in building [26].
On the other hand, Kondo and Ibamoto [28] studies the feasibility of the utilization of
PCM ceiling boards with the aim to minimize energy consumption during the peak time. The
thermal capacity of PCM ceiling board was measured by using a small chamber,
approximately 16m
2
surface area. The PCM ceiling boards was developed by adding the
microencapsulated PCM to the commonly used rock wool ceiling board. The mixture of n-
paraffins with a melting point of 25ºC was used in this study.
During overnight, the cool air from air handling unit (AHU) will flow into the ceiling
chamber space and cools the PCM ceiling board, storing the cool thermal energy. During the
peak shaving period, the air from the room returns to the AHU through the ceiling chamber
space. The warm air returning from the room is cooled down when passing through the cool
PCM ceiling board, before entering the AHU unit. As a result, the maximum thermal load is
recorded to decrease by 14.8%. Besides, the utilization of PCM ceiling boards is reported to
lower the electricity cost for 91.6% compared to the use of conventional rock wool ceiling
board. This study concludes that the utilization of PCM ceiling system is effective for peak
shaving control [28].
Zhou et al. [29] proposed the commonly used of variable air volume air-conditioning
(VAV-AC) to be enhanced by attaching the shape stabilized phase change material (SSPCM)
plates to the inner surfaces of all external walls. The proposed SSPCM is a high-density
polyethylene (HDPE) and paraffin. The melting
temperature and heat of fusion of proposed
PCMs is 23ºC and 160 kJ/kg respectively. The result shows that the building peak load and
electricity cost could be reduced for over 20% and 11% respectively.
3.2 Passive Cooling
The principle aim of passive cooling is to maximize the comfort and health of building
tenants and minimizing the energy demand, simultaneously. Passive TES has been proven to
effectively improve the comfort conditions while minimizing the needs of mechanically
heating or cooling systems [30]. This strategy removes heat from the building and prevents
any heat gain from the surroundings [31].
In general, the flow of energy in passive design is based on natural means, radiation,
conduction, convection without the use of mechanical devices to dissipate heat. It utilizes on-
site energy, accessible from natural environment, together with the architectural design of
building components [32]. Passive cooling requires a good natural resources as a heat sinks.
For instance, onsite heat sinks are soil, night sky (environment) or wind. The example of
recent passive systems includes thermal mass [33], solar heating and night ventilation
technique [33], shading effect using blinds [34], use of ventilation facades and coated glazing
elements [35].
In Dubai, United Arab Emirates (UAE), passive cooling strategies were investigated. An
energy simulation software, Integrated Environmental Solutions (IES) was used to simulate the
cooling performance of the buildings. This study proposed eight passive cooling strategies (Figure
3). For instance, the utilization of double glazing and good shading devices are proposed to
minimize the heat gain. These strategies has been proven that it could attain the reduction of
energy consumption. Green roofing method was also verified as an effective roof insulation. The
passive cooling strategy shows a remarkable finding of 23.6% total annual energy consumptions
[30].
Fig. 2. Set up for PCM storage tank integrated with air conditioning system [26].
Fig. 3. Passive cooling strategies [30].
3.2.1 Material candidates for passive cooling storage
Typical heat sinks alternative used in buildings are high thermal mass materials such as stone,
concrete, or alveolar bricks [36]. Standard solar walls and solar water walls are the example
5
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
of sensible storage that are being applied to save energy in buildings [37, 38]. PCMs thermal
storage is also a good candidate for passive cooling in buildings. For instance, PCM is
recorded to be able to store eighteen times more energy compared to the brick material [39].
PCMs thermal storage can be incorporated into building components such as ceiling, floor,
windows, enclosure and partition walls.
The main purpose of integrating PCM into lightweight construction materials is to
increase the thermal mass. Numerous studies has been conducted on the integration method
of PCM into buildings. It involves PCM encapsulation, micro-encapsulation, direct
incorporation immersion, and shape stabilization [40]. The incorporation of PCM macro
encapsulated into a typical Portuguese clay brick masonry enclosure wall was investigated
[39]. Both testing and numerical simulation were carried out in the project. The steel macro
capsules with the size of 300mm x 170mm x 28mm and 0.75mm mean thickness were filled
with PCM and been implanted into the middle brick as shown in Figure 4.
Experimental result shows that the incorporation of macro encapsulated PCM into the
wall could reduce the thermal amplitude of 10ºC to 5ºC. Besides, it is also can prolonged the
time delay of about 3 hours. In short, this result indicates that PCM is a viable option to store
the thermal energy, which yields the reduction of the temperature fluctuation. The maximum
energy savings recorded is 1888 kJ or 0.52 kWh. Considering the PCM works for 146days a
year with the PCM cycle occurs once a day at maximum performance, the PCM wall is
capable to store 76 kWh. For a mean compartment size of 100 m
2
, the presented solution
could decrease over 760 kWh of energy demands from the HVAC system per year [41].
Fig. 4. System configurations of passive cooling with incorporated PCM into typical Portuguese clay
brick masonry enclosure wall [41].
Other than that, PCM-wallboards are developed with the incorporated of expanded
graphite nanosheets in order to enhance the thermal conductivity with the purpose to improve
overall energy distribution [42]. Besides, the addition of an aluminum honeycomb with
microencapsulated PCM-wallboard (Figure 5) also investigated towards the same objectives
[43]. Good insulation is also highlighted as a promising approach to incorporate PCM in
building. This concept has been studied by Yang et al. [44]. It shows that the integration of
PCM thermal storage with insulation performance of polyurethane foam make a good team
for energy savings purpose in buildings.
Besides, the mixture of PCM with concrete or mortar is listed as one of the suitable
approaches of passive cooling system [45, 46]. One of the objective of this integration is to
sustain the mechanical properties of the concrete, in the time increasing its specific heat
capacity. Entrop et. al., [47] studied the performance of PCM integrated concrete floor. Full
scale experimental investigation on four identical chambers were conducted. The only heat
source in this experiments are from the solar irradiation through the windows. Experimental
test rig was constructed with two chambers use the conventional floor while another two
chambers are incorporated with PCM concrete floor. Result shows that this technique is
capable to reduce the temperature fluctuations in the PCM-
concrete chambers. Nonetheless,
the concrete floor is commonly will be covered by any kind of
covering
such as tiles, polyvinyl
or wood. This will shelter the PCM concrete floor from direct solar radiation. Hence, it was found
that there are difficulties in implementing this technique in a broader
scale
practice [47].
Fig. 5. PCM-honeycomb wallboard [43].
Form the observation, the most remarkable advantage of passive cooling technique is the
ability to improve the thermal comfort with the use of nil or minimum power consumption.
Passive cooling technique is agreed to be eco-friendly compared to the active cooling
technique. Even so, passive cooling is a climate-influenced technique. Hence, different
approaches are needed for a different climate zone. This circumstance prescribed that their
performance may fluctuate with time of day and seasons. As many drawbacks of passive
cooling technique are found, further studies are found crucial. Researchers should focus on
the initiative to reduce the overdependence of this technique onto several factors such as
climate, and site designs.
On the contrary, if a building cannot be cooled using passive means, the active cooling
technique need consideration. Active cooling technique is accounted to be more flexible and
can be implemented in various ways. Previous studies show that the integration of TES
system is very useful to reduce the energy consumption during peak time. In a nutshell, one
may conc lude that the integration of TES system in building application has been extensively
studied. Despite of some limitations, the integration of TES system for both active and
passive techniques has been proven to be beneficial towards energy sustainability. Excellent
energy management is foreseen to be able to counterbalance the soaring energy demand.
4 Conclusion
The integration of the thermal energy storage for active and passive cooling in building is
discussed. Several examples of both cooling design has been presented in this paper. The
utilization of passive cooling with TES system is limited due to the overdependence on
climatic factor, storage materials properties, and the architecture of the building itself. In
contrast, active cooling technique is more versatile and could be integrated in many ways.
Nonetheless, the integration of these system may result additional issues to the building
physics such as humidity issue, air tightness and thermal bridge. Therefore, further study on
this subject matters are required to achieve the optimum cooling design in order to attain the
reduction of overall energy consumption.
6
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
of sensible storage that are being applied to save energy in buildings [37, 38]. PCMs thermal
storage is also a good candidate for passive cooling in buildings. For instance, PCM is
recorded to be able to store eighteen times more energy compared to the brick material [39].
PCMs thermal storage can be incorporated into building components such as ceiling, floor,
windows, enclosure and partition walls.
The main purpose of integrating PCM into lightweight construction materials is to
increase the thermal mass. Numerous studies has been conducted on the integration method
of PCM into buildings. It involves PCM encapsulation, micro-encapsulation, direct
incorporation immersion, and shape stabilization [40]. The incorporation of PCM macro
encapsulated into a typical Portuguese clay brick masonry enclosure wall was investigated
[39]. Both testing and numerical simulation were carried out in the project. The steel macro
capsules with the size of 300mm x 170mm x 28mm and 0.75mm mean thickness were filled
with PCM and been implanted into the middle brick as shown in Figure 4.
Experimental result shows that the incorporation of macro encapsulated PCM into the
wall could reduce the thermal amplitude of 10ºC to 5ºC. Besides, it is also can prolonged the
time delay of about 3 hours. In short, this result indicates that PCM is a viable option to store
the thermal energy, which yields the reduction of the temperature fluctuation. The maximum
energy savings recorded is 1888 kJ or 0.52 kWh. Considering the PCM works for 146days a
year with the PCM cycle occurs once a day at maximum performance, the PCM wall is
capable to store 76 kWh. For a mean compartment size of 100 m
2
, the presented solution
could decrease over 760 kWh of energy demands from the HVAC system per year [41].
Fig. 4. System configurations of passive cooling with incorporated PCM into typical Portuguese clay
brick masonry enclosure wall [41].
Other than that, PCM-wallboards are developed with the incorporated of expanded
graphite nanosheets in order to enhance the thermal conductivity with the purpose to improve
overall energy distribution [42]. Besides, the addition of an aluminum honeycomb with
microencapsulated PCM-wallboard (Figure 5) also investigated towards the same objectives
[43]. Good insulation is also highlighted as a promising approach to incorporate PCM in
building. This concept has been studied by Yang et al. [44]. It shows that the integration of
PCM thermal storage with insulation performance of polyurethane foam make a good team
for energy savings purpose in buildings.
Besides, the mixture of PCM with concrete or mortar is listed as one of the suitable
approaches of passive cooling system [45, 46]. One of the objective of this integration is to
sustain the mechanical properties of the concrete, in the time increasing its specific heat
capacity. Entrop et. al., [47] studied the performance of PCM integrated concrete floor. Full
scale experimental investigation on four identical chambers were conducted. The only heat
source in this experiments are from the solar irradiation through the windows. Experimental
test rig was constructed with two chambers use the conventional floor while another two
chambers are incorporated with PCM concrete floor. Result shows that this technique is
capable to reduce the temperature fluctuations in the PCM-
concrete chambers. Nonetheless,
the concrete floor is commonly will be covered by any kind of
covering
such as tiles, polyvinyl
or wood. This will shelter the PCM concrete floor from direct solar radiation. Hence, it was found
that there are difficulties in implementing this technique in a broader
scale
practice [47].
Fig. 5. PCM-honeycomb wallboard [43].
Form the observation, the most remarkable advantage of passive cooling technique is the
ability to improve the thermal comfort with the use of nil or minimum power consumption.
Passive cooling technique is agreed to be eco-friendly compared to the active cooling
technique. Even so, passive cooling is a climate-influenced technique. Hence, different
approaches are needed for a different climate zone. This circumstance prescribed that their
performance may fluctuate with time of day and seasons. As many drawbacks of passive
cooling technique are found, further studies are found crucial. Researchers should focus on
the initiative to reduce the overdependence of this technique onto several factors such as
climate, and site designs.
On the contrary, if a building cannot be cooled using passive means, the active cooling
technique need consideration. Active cooling technique is accounted to be more flexible and
can be implemented in various ways. Previous studies show that the integration of TES
system is very useful to reduce the energy consumption during peak time. In a nutshell, one
may conc lude that the integration of TES system in building application has been extensively
studied. Despite of some limitations, the integration of TES system for both active and
passive techniques has been proven to be beneficial towards energy sustainability. Excellent
energy management is foreseen to be able to counterbalance the soaring energy demand.
4 Conclusion
The integration of the thermal energy storage for active and passive cooling in building is
discussed. Several examples of both cooling design has been presented in this paper. The
utilization of passive cooling with TES system is limited due to the overdependence on
climatic factor, storage materials properties, and the architecture of the building itself. In
contrast, active cooling technique is more versatile and could be integrated in many ways.
Nonetheless, the integration of these system may result additional issues to the building
physics such as humidity issue, air tightness and thermal bridge. Therefore, further study on
this subject matters are required to achieve the optimum cooling design in order to attain the
reduction of overall energy consumption.
7
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
The authors acknowledge the technical support from the School of Mechatronic Engineering at the
Universiti Malaysia Perlis (UniMAP). This work is funded by the FRGS grants No. 9003-00564,
provided by the Ministry of Higher Education, Malaysia.
References
1. International Energy Agency (IEA) Statistics https://www.iea.org/
2. K. Calautit K, H. N. Chaudhry, B. R. Hughes, S. A. Ghani, ApplEnergy, 101, 740–55
(2013)
3. B. R. Hughes, H. N. Chaudhry, S. A. Ghani, B. Richard, H. Nasarullah, S. Abdul, Renew
Sustain Energy, 15, 3112–20 (2011)
4. H. Akeiber, P. Nejat, M. Z. A. Majid, M. A.Wahid, F. Jomehzadeh, Renewable and
Sustainable Energy Review 60, 1470-97 (2016)
5. 5. R. Pacheco, J. Ordo˜nez∗, G. Martinez, Renewable and Sustainable Energy Reviews,
16, 3559-3573 (2012)
6. M. J. Shoubi, M. V. Shoubi, A. Bagchi, A. S. Barough, AinShm EngineJournal, 6, 41-
55 (2015)
7. N. B. Geetha, R. Velraj, Energy Sci Res, 29, 913–46 (2012)
8. M.A. Kamal Civil Eng. Archit. 55, 1, (2012)
9. L. Gabriela, Leo Electronic J of Practices and Technologies, 20, 75-98 (2012)
10. H. Mehling and L. F. Cabeza, Heat and Cold with PCM (2008)
11. S. Kalaiselvam, R. Parameshwaran Thermal Energy Storage Technologies for
Sustainability: Systems Design (2012)
12. H. Mehling and L. F. Cabeza, Heat and Cold with PCM (2008)
13. A. De Gracia, E. Oro´, M. M. Farid, L.F. Cabeza, Appl. Therm. Eng, 31, 3938-3945
(2011)
14. P.A. Prabhu, N. N. Shinde, P.S. Patil., IJERA, 2, 871-875 (2012)
15. M.F. Demirbas, Energy Sources. 1(B), 85-95, (2006)
16. P. Verma, Varun, S.K. Singal, Renewable and Sustainable Energy Reviews., 12, 999-
1031 (2008)
17. B, Zalba, J. M. Marin, L. F. Cabeza, H, Mehling, Appl. Therm. Eng, 23, 3, 251 – 283
(2003)
18. I. Dincer, M. A. Rosen, Thermal Energy Storage Systems and Application (2011)
19. S. M. Vakilaltojjar, Phase change thermal storage system for space heating and cooling.
PhD thesis, University of South Australia, (2000)
20. B. Givoni, John Wiley & Sons, (1994)
21. Baetens, Ruben, B. Petter, A. Gustavsen., 42, 361–68, (2012)
22. Y. Sun, S. Wang, F. Xiao, D. Gao, Energy Convers. Manage, 71,101–114, (2013)
23. A. Waqas, Z. Ud Din, Renewable Sustainable Energy Rev., 18, 607–625 (2013)
24. D. Saelens, W. Pays, R. Baetens, Build. Environ, 46, 835–848 (2011)
25. L. Navarro, A. de Gracia, S. Colclough, M. Browne, L. F. Cabeza, En and Build, 103,
414–419 (2015)
26. M. Yamaha, S. Misaki, HVAC&Research, 12, 861–869 (2006)]
27. T. Kondo, T. Ibamoto, ASHRAE Trans, 526–531 (2006)
28. G. Zhou, Y. Yang, H. Xu, Sol En, 85, 3, 477–485 (2011)
29. H. M. Taleb, Frontiers of Architectural Research, 3,154-165 (2014)
30. M. Santamouris, D. Asimakoupolos, Passive cooling of buildings, James & James
(Science Publisher)
31. M. J. Lim, AIVC (1998)
32. A. Castell, I. Martorell, M. Medrano, G. Perez, L.F. Cabeza, Energy Build, 42, 534-540
(2010)
33. E. Gratia, A. De Herde, Energy Build, 39, 364-373 (2007)
34. B. Eriksson, A. Blomsterberg, ECEEE (2009)
35. A. Castell, I. Martorell, M. Medrano, G. Pe´ rez , L.F. Cabeza LF, Energy Build. 42,
534-540 (2010)
36. A. de Gracia A, A. Castell, M. Medrano, L.F. Cabeza, Energy Conserv. Manage. 52,
2495-2500 (2011)
37. E. Gratia, A. De Herde, Energy Build. 39, 364-373 (2007)
38. J. Kosny, PCM-Enhanced Building Components, Springer (2015)
39. S.A. Memon, Renewable Sustainable Energy Rev, 31, 870-906 (2014)
40. T. Silva, R. Vicente, N. Soaresb, V. Ferreirac, Energy Build., 49, 235–245, ( 2012)
41. K. Biswas, J. Lu, P. Soroushian, S. Shrestha Appl. Energy, 131, 517–529 (2014)
42. C. Lai, S. Hokoi Energy Build, 73, 37–47 (2014)
43. C. Yang, L. Fischer, S. Maranda, J. Worlitschek Energy Build, 87, 25–36 (2015)
44. D. Desai, M. Miller, J.P. Lynch, V.C. Li Build. Mater. 67,366–372 (2014)
45. Joulin, L. Zalewski, S. Lassue, H. Naji Appl. Therm. Eng, 66,171–180 (2014)
46. A.G. Entrop, H.J.H. Brouwers, A.H.M.E. Reinders, Solar Energy, 85, 1007–1020 (2011)
8
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
The authors acknowledge the technical support from the School of Mechatronic Engineering at the
Universiti Malaysia Perlis (UniMAP). This work is funded by the FRGS grants No. 9003-00564,
provided by the Ministry of Higher Education, Malaysia.
References
1. International Energy Agency (IEA) Statistics https://www.iea.org/
2. K. Calautit K, H. N. Chaudhry, B. R. Hughes, S. A. Ghani, ApplEnergy, 101, 740–55
(2013)
3. B. R. Hughes, H. N. Chaudhry, S. A. Ghani, B. Richard, H. Nasarullah, S. Abdul, Renew
Sustain Energy, 15, 3112–20 (2011)
4. H. Akeiber, P. Nejat, M. Z. A. Majid, M. A.Wahid, F. Jomehzadeh, Renewable and
Sustainable Energy Review 60, 1470-97 (2016)
5. 5. R. Pacheco, J. Ordo˜nez∗, G. Martinez, Renewable and Sustainable Energy Reviews,
16, 3559-3573 (2012)
6. M. J. Shoubi, M. V. Shoubi, A. Bagchi, A. S. Barough, AinShm EngineJournal, 6, 41-
55 (2015)
7. N. B. Geetha, R. Velraj, Energy Sci Res, 29, 913–46 (2012)
8. M.A. Kamal Civil Eng. Archit. 55, 1, (2012)
9. L. Gabriela, Leo Electronic J of Practices and Technologies, 20, 75-98 (2012)
10. H. Mehling and L. F. Cabeza, Heat and Cold with PCM (2008)
11. S. Kalaiselvam, R. Parameshwaran Thermal Energy Storage Technologies for
Sustainability: Systems Design (2012)
12. H. Mehling and L. F. Cabeza, Heat and Cold with PCM (2008)
13. A. De Gracia, E. Oro´, M. M. Farid, L.F. Cabeza, Appl. Therm. Eng, 31, 3938-3945
(2011)
14. P.A. Prabhu, N. N. Shinde, P.S. Patil., IJERA, 2, 871-875 (2012)
15. M.F. Demirbas, Energy Sources. 1(B), 85-95, (2006)
16. P. Verma, Varun, S.K. Singal, Renewable and Sustainable Energy Reviews., 12, 999-
1031 (2008)
17. B, Zalba, J. M. Marin, L. F. Cabeza, H, Mehling, Appl. Therm. Eng, 23, 3, 251 – 283
(2003)
18. I. Dincer, M. A. Rosen, Thermal Energy Storage Systems and Application (2011)
19. S. M. Vakilaltojjar, Phase change thermal storage system for space heating and cooling.
PhD thesis, University of South Australia, (2000)
20. B. Givoni, John Wiley & Sons, (1994)
21. Baetens, Ruben, B. Petter, A. Gustavsen., 42, 361–68, (2012)
22. Y. Sun, S. Wang, F. Xiao, D. Gao, Energy Convers. Manage, 71,101–114, (2013)
23. A. Waqas, Z. Ud Din, Renewable Sustainable Energy Rev., 18, 607–625 (2013)
24. D. Saelens, W. Pays, R. Baetens, Build. Environ, 46, 835–848 (2011)
25. L. Navarro, A. de Gracia, S. Colclough, M. Browne, L. F. Cabeza, En and Build, 103,
414–419 (2015)
26. M. Yamaha, S. Misaki, HVAC&Research, 12, 861–869 (2006)]
27. T. Kondo, T. Ibamoto, ASHRAE Trans, 526–531 (2006)
28. G. Zhou, Y. Yang, H. Xu, Sol En, 85, 3, 477–485 (2011)
29. H. M. Taleb, Frontiers of Architectural Research, 3,154-165 (2014)
30. M. Santamouris, D. Asimakoupolos, Passive cooling of buildings, James & James
(Science Publisher)
31. M. J. Lim, AIVC (1998)
32. A. Castell, I. Martorell, M. Medrano, G. Perez, L.F. Cabeza, Energy Build, 42, 534-540
(2010)
33. E. Gratia, A. De Herde, Energy Build, 39, 364-373 (2007)
34. B. Eriksson, A. Blomsterberg, ECEEE (2009)
35. A. Castell, I. Martorell, M. Medrano, G. Pe´ rez , L.F. Cabeza LF, Energy Build. 42,
534-540 (2010)
36. A. de Gracia A, A. Castell, M. Medrano, L.F. Cabeza, Energy Conserv. Manage. 52,
2495-2500 (2011)
37. E. Gratia, A. De Herde, Energy Build. 39, 364-373 (2007)
38. J. Kosny, PCM-Enhanced Building Components, Springer (2015)
39. S.A. Memon, Renewable Sustainable Energy Rev, 31, 870-906 (2014)
40. T. Silva, R. Vicente, N. Soaresb, V. Ferreirac, Energy Build., 49, 235–245, ( 2012)
41. K. Biswas, J. Lu, P. Soroushian, S. Shrestha Appl. Energy, 131, 517–529 (2014)
42. C. Lai, S. Hokoi Energy Build, 73, 37–47 (2014)
43. C. Yang, L. Fischer, S. Maranda, J. Worlitschek Energy Build, 87, 25–36 (2015)
44. D. Desai, M. Miller, J.P. Lynch, V.C. Li Build. Mater. 67,366–372 (2014)
45. Joulin, L. Zalewski, S. Lassue, H. Naji Appl. Therm. Eng, 66,171–180 (2014)
46. A.G. Entrop, H.J.H. Brouwers, A.H.M.E. Reinders, Solar Energy, 85, 1007–1020 (2011)
9
MATEC Web of Conferences 225, 03022 (2018) https://doi.org/10.1051/matecconf/201822503022
UTP-UMP-VIT SES 2018
