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Research Article EVALUATIONS ON THE ENERGY IDENTITY CERTIFICATE AND THE USABILITY OF CALCULATION METHOD OF BUILDING ENERGY PERFORMANCE (BEP)

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In this study, the energy performances for the insulated and uninsulated statuses of a building located in Selcuklu district of Konya were determined and compared. The energy efficiency of the insulated and uninsulated building was examined using the Building Energy Performance Program (BEP-TR 2). In addition, the results obtained from this program was compared with the results obtained from TS-825 and was interpreted. Within the scope of the study, the project information of the building (geometry of building and heating, lighting, mechanical and ventilation system information) was entered into the BEP-TR Program, and clear energy amounts for the heating and cooling needs of the building were determined. Besides, the need of lighting energy, the amount of consumption and the emission amounts of carbon dioxide (CO2) were determined in the days when the daylight was not utilized and in the areas that had no effect on daylight. Heat loss and heat gain calculations of the building have been made, according to TS-825. In consequence of the data obtained, the annual heating energy need of the insulated building was determined as 92 kWh/m² and the energy class was determined as C class, with the BEP-TR program. However, the annual heating energy need of the uninsulated building was 134 kWh/m² and the energy class was determined E class.
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Sigma J Eng & Nat Sci 11 (1), 2020, 103-113
Research Article
EVALUATIONS ON THE ENERGY IDENTITY CERTIFICATE AND THE
USABILITY OF CALCULATION METHOD OF BUILDING ENERGY
PERFORMANCE (BEP)
Kadir BILEN1, Esra URMAMEN2, Muhammed Taha TOPCU
*
3,
Ismail SOLMAZ4
1Atatürk University, Department of Mechanical Engineering, ERZURUM; ORCID:0000-0001-7701-8573
2Atatürk University, Department of Mechanical Engineering, ERZURUM; ORCID:0000-0001-6104-3301
3Atatürk University, Department of Mechanical Engineering, ERZURUM; ORCID:0000-0002-4820-9044
4Atatürk University, Department of Mechanical Engineering, ERZURUM; ORCID:0000-0002-3020-4798
Received: 15.11.2019 Revised: 23.03.2020 Accepted: 16.05.2020
ABSTRACT
In this study, the energy performances for the insulated and uninsulated statuses of a building located in
Selcuklu district of Konya were determined and compared. The energy efficiency of the insulated and
uninsulated building was examined using the Building Energy Performance Program (BEP-TR 2). In
addition, the results obtained from this program was compared with the results obtained from TS-825 and was
interpreted. Within the scope of the study, the project information of the building (geometry of building and
heating, lighting, mechanical and ventilation system information) was entered into the BEP-TR Program, and
clear energy amounts for the heating and cooling needs of the building were determined. Besides, the need of
lighting energy, the amount of consumption and the emission amounts of carbon dioxide (CO2) were
determined in the days when the daylight was not utilized and in the areas that had no effect on daylight. Heat
loss and heat gain calculations of the building have been made, according to TS-825. In consequence of the
data obtained, the annual heating energy need of the insulated building was determined as 92 kWh/m² and the
energy class was determined as C class, with the BEP TR program. However, the annual heating energy need
of the uninsulated building was 134 kWh/m² and the energy class was determined E class.
Keywords: Energy efficiency, building energy performance (BEP-TR), energy identity certificate.
1. INTRODUCTION
With the rapid population growth and developing technology all over the world and in our
country, energy needs are increasing day by day. Therefore, energy efficiency gains important.
Most of the available energy is spent on buildings. Especially, it is expected that there will be a
decrease in fossil fuels and accordingly an energy shortage in the coming years. This reveals the
importance of energy efficiency.
In order to use energy more efficiently and effectively, countries continue to work on energy
efficiency. Especially the European Union, most of the energy produced in our country is
consumed in buildings, and therefore energy efficiency studies are among the most current topics.
*
Corresponding Author: e-mail: taha.topcu@atauni.edu.tr, tel: (442) 231 48 31
Publications Prepared for the Sigma Journal of Engineering and Natural Sciences
2019 3rd International Conference on Advanced Engineering Technologies
Special Issue was published by reviewing extended papers
104
In a study conducted in the literature on the Energy Performance of Buildings - Turkey Program
(BEP) and the implementation of Energy Identity Certificate (EIC), the energy identity of the
Building of Gaziantep Acceptance and Housing Center, which has European Union standards, has
been determined in the province of Gaziantep, and the energy performance of the building was
examined using the BEP program. Within this scope, using the mechanical, heating and geometry
information of the building, energy consumption values were determined with the BEP-TR
program, and evaluations have been made on how annual energy consumption values will affect
the national budget and on the energy efficiency of a building with international standards [1]. In
addition, the energy rate and CO2 emission amounts consumed for the annual illumination of a
building were evaluated. As a result of the study, program-borne errors were identified and
solutions were proposed for these errors [2]. The Ministry of Environment and Urbanization
developed a new version of the BEP-TR program (BEP) and launched it in 2014. By using this
program, more comprehensive and sensitive results are obtained today [3].
In a master's thesis study, methods that increase energy efficiency and the international energy
certification systems in residences were examined. Also, the BEP-TR program has been examined
and shown its usage; and the BEP-TR program has been compared with other systems that
provide certification [4]. In another study, in four different provinces in different regions of
Turkey, energy performance class and energy identity of the same building were determined
using BEP-TR program. Energy identity class of the buildings was calculated as C class for
Istanbul, Ankara, Erzurum; and D class for Antalya. Comparisons were made on the energy
performance results of the buildings depending on the provinces [5].
In another study, it examined and was compared the international energy certification systems
and the energy certification systems applied in Turkey. Within this scope, the Directive on the
Energy Performance of Buildings in Turkey was examined and evaluated [6]. In another study,
energy performance classes of the buildings located in 6 different neighborhoods in Korkuteli
district of Antalya were determined with the BEP-TR program and it was found that the energy
performance class of these buildings were C class. For buildings with different locations and
topologies, comparisons were made in terms of the energy efficiency [7]. In a different study
where situation analyzes were made according to the architectural settlement location, the
researchers emphasized that the energy efficiency should be revised with results obtained
according to the settlement location. In this context, it was emphasized that the energy efficiency
is the same as the results obtained from the Relux and Carrier-HAP programs and the results from
the BEP-TR program. Comparisons were made between different operating modules, heating,
ventilation, cooling and lighting conditions, and more comprehensive information was obtained.
Values for lighting were compared using the Relux Module [8].
The BEP-TR has been a program which is used in the energy class implementation in
buildings in our country as well as in the world, and provides more accurate results within the
scope of improvements made for buildings. With the EIC (Energy Identity Certificate)
implementation, the building energy class in Turkey has been correctly identified and uncovered
significant results on behalf of energy efficiency [9].
2. MATERIAL AND METHOD
In this study, an energy efficiency analysis was made with the BEP-TR program for a sample
building belonging to Selcuklu district of Konya and energy class was determined. This building
consists of a block including 10 apartments in Selcuklu district of Konya. In addition, it consists
of 6 floors including the basement and there are 2 apartments on each floor. In this study, TS-825
calculation method and BEP-TR method were used for the conditions of the building before and
after insulation, and the results obtained from both methods were compared. Building heat loss
and heat gain calculations were made for TS 825 method and energy performance in buildings
was obtained by entering building mechanical system information in BEP program.
K. Bilen, E. Urmamen, M.T. Topcu, I. Solmaz / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
105
According to TS 825, the annual heating energy calculation of the building is calculated as
follows [10]
Qyear = ∑ Qmonth =∑(Qheat loss -ɳ.Qgain)month (1)
Omonth = [H(Ti -Td)- ɳmonthi,month+ ɸ s,month].t (2)
Here:
Qyear, Qmonth: Monthly and annual heating energy need for building, respectively (J)
Oheat loss: Heat loss of building calculated according to TS 825 of the building (W/m2)
H: Specific heat loss per unit temperature difference of the building (W / K)
ɸi,month: Monthly average internal heat gain for building (W)
ɸ s,month : Monthly average heat gain from sun (W)
t: time of a month (s)
The specific heat loss (H) of the building is equal to the sum of the specific heat loss through
conduction and convection (Hi) and the specific heat losses through the ventilation (Hh) of the
building,
H=Hi + Hh (3)
Specific heat loss through conduction and convection is the calculated heat loss when there is
a temperature difference of 1°C from these structural elements Specific heat loss through
conduction and convection,
Hi = ∑AU + IUI (4)
∑AU = UD.AD+ UP.AP +UK.AK+ 0,8 UT.AT+ 0,5 Ut.At + Ud.Ad+ 0,5.Udsıc.Adsıc (5)
Here;
∑AU: Heat loss calculated from external walls, windows and doors, ceiling and floor covering, at
1°C temperature difference (W/K),
U: Overall heat transfer coefficient (W/m2K),
A: Heat transfer surface area (m2)
IUI: In the event that there is a heat bridge on the outer surface of the building elements, the heat
loss that is for 1°C temperature difference,
The subscripts used here, D: outer wall, P: window, K: door, T: ceiling, t: floor, dsıc: adjacent
room temperature
2.1. Structure of the Building
The general information of the building examined within the scope of this study is as follows;
The building consists of a total of 6 floors, including the basement, and the floor height is
3m.
The exterior wall and roof building components of the building specified in the study are
given in Table 2.1.
For the building, where insulation is made, 0.1 m thick rock wool is used for the roof
ceiling and 0.05 m thick for external walls, in the purpose of the insulation.
Evaluations on the Energy Identity Certificate / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
106
Table 2.1. Roof and wall component thicknesses of the building
Exterior Wall and Roof Components of the Building and Their Thicknesses
Wall components
Roof structure
Thickness
(m)
Gypsum mortar, lime-gypsum
mortar
Mortar screed having cement
0.03
Walls made with a horizontal
perforated brick
Reinforced concrete
0.12
Thermal insulation material (glass
wool, rock wool)
Thermal insulation material
(glass wool, rock wool)
0.01
Plaster made from inorganic
lightweight aggregates
Plaster made from inorganic
lightweight aggregates
0.02
2.2. Building Energy Management Program
The BEP-TR program is a national building energy performance program approved by the
Ministry of Environment and Urbanization and used by users. The first version of BEP-TR, the
national certification program, was launched in 2010. This BEP-TR program is in the form of a
document containing information on the energy need, energy consumption classification,
insulation properties and efficiency of heating and/or cooling systems of the minimal building. It
is also a software program that issues an energy identity certificate (EIC) and is accessed through
the Ministry's internet address by users.
Within the scope of the Directive on the Energy Performance of Buildings published in our
country in 2008, BEP, the first program of the national building energy performance software
created 3 years after the publication of the directive, contains many shortcomings. Some of these
shortcomings are;
The questions on the mechanical systems tab are difficult to understand by the users
When determining the general energy class of the building; heating, cooling and lighting are
given as a single result by taking the average of the mechanical system classes. Consequently, the
energy inefficiency in the heating system has raised doubts that the shortcomings of another
system has been overcome and the certificate does not reflect the truth.
Since all alternative energy sources (led lighting, geothermal energy, etc.) are not defined in
the system, there is a lack of accuracy in the certificate.
There is no software part in the program where CAD-based building geometry can be
transferred to the program
Introducing building structure geometry to the program using only similar shapes (U, H, L,
square, rectangle, etc.)
The fact that any information exchange on the Mechanical Systems tab directly affects the
building energy class has reduced the reliability of its program.
Not all renewable energy sources are defined in the system, so there is no issuing of class A
energy identity certificate in particular. In other words, it defines a Class A building and a Class B
building as the same, and does not show any difference between them.
The first version of this program was launched as BEP-TR 1 and after these shortcomings
were eliminated in the program, it was updated as BEP-TR 2. In this study, building performances
related to energy efficiency were examined by using BEP-TR 2 program. The BEP program can
evaluate the building to include heating, sanitary hot water, cooling, ventilation, lighting,
cogeneration and photovoltaic systems. The BEP-TR-2 program classifies building energy
performances into energy performance classes such as A, B, C, D, E, F, G. It is classified as Class
A with the highest energy performance and Class G with the lowest. After the building
information is entered in the BEP-TR program, the energy class of the building is determined; and
K. Bilen, E. Urmamen, M.T. Topcu, I. Solmaz / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
107
it must be at least C class in order for the building in question to be an acceptable building in
terms of energy efficiency and to get an energy identity certificate. These different energy classes
and energy performances are given in Table 2.2.
Table 2.2. The changes of energy performance level according to the energy class index in BEP
program
Energy Performance
Level
Energy Class
Index
A
0-39
B
40-79
C
80-99
D
100-119
E
120-139
F
140-174
G
175-
The issuance process of the energy identity certificate, which specifies the energy
performance class, is carried out as follows: The expert of the energy identification certificate
(EIC) authorized by the Ministry of Environment and Urbanization provides the building
information to be entered to the program by logging in the BEP-TR program with the user name
and password defined by the ministry. Then the calculation is made by using this information
entered into the central database with the internet-based BEP-TR program, and as a result, the
program creates the energy performance form of the building. After this form is approved by the
ministry, the Energy Identity Certificate (EIC) is issued and the process is terminated. The
issuance process of the Energy Identity Certificate is shown in Figure 2.1.
Figure 2.1. The issuance process of energy identity document [11, 12]
Evaluations on the Energy Identity Certificate / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
108
Figure 2.2 Screen shot of the BEP process schema (structure model and information entry) [13]
2.3. Process Steps Of BEP-TR Program
BEP-TR methodology is a program that works under four titles by the Ministry of
Environment and Urbanization.
These applications are as follows.
BEP-BUY: The desktop application creates the data file in XML format and it is the part that
works offline and online to transmit to BEP-MY and that belongs to the Ministry.
BEP-IS: It is the Operating System of BEP.
BEP-MY: It is the application that makes calculations according to the National Calculation
Methodology.
BEP-ONAY: It is the approval application part of the EIC (Energy Identity Certificate).
Among these applications, BEP-IS is fully works as web-based and is administrative control
mechanism of the Ministry in terms of the authorization, user information, reports, etc.
BEP-BUY is a part of information entry developed for the end user, defined as a user
interface, that can work online and offline (Figure 2.2).
BEP-MY provides results by transferring data to the calculation algorithm from the user
interface. The calculation is carried out in the web-based online system under the control of the
Ministry. The results obtained after the calculation are used to provide an Energy Identity
Certificate for the relevant building. This application is also included in the online system [12].
3. EXPERIMENTAL STUDIES
In this study, the information required for the determination of the building energy
performance was taken from the previous static, architectural and mechanical projects of the
building and calculations were made. The annual amount of energy needed by the building for
heating and cooling of buildings has been determined by entering the information of the building
of which energy performance is calculated and consists of a block including 10 apartments into
the BEP-TR (Building Energy Performance) Program, and the lighting energy need and
consumption amount have been determined for the times when the daylight is not used and the
areas where daylight is not effective, considering daylight effects on the building, and the carbon
dioxide (CO2) emission amounts of the building were calculated.
K. Bilen, E. Urmamen, M.T. Topcu, I. Solmaz / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
109
3.1. Analysis
In this study the building energy performance evaluation has been done for the insulated and
uninsulated form of a building located in Selcuklu district of Konya. The results obtained from
the BEP-TR program are shown in the tables below. In the study, heating, cooling, hot water,
lighting and carbon dioxide gas emission amounts for the insulated and uninsulated building were
evaluated in terms of energy efficiency. In the Table 3.1-3.2, an energy identity certificate was
issued for the uninsulated and insulated building, respectively, and the building's heating, cooling,
ventilation, lighting system and carbon dioxide gas emission values are shown.
Table 3.1. Results of the energy identity certificate for the uninsulated building
Systems
Total
Consumption
(kWh/yıl)
Primary
Consumption
(kWh/yıl)
Consumption
per unit area
(m2)
Class
Heating
215 959.0
218 205.9
228.81
F
Hot water
17 725.5
18 046.1
18.92
D
Air conditioning
4 86.8
1 008,7
1.06
C
Air ventilation
0,0
0.0
0.0
D
lighting
1 435,8
2 974,9
3.12
B
Greenhouse Gas Emission
59.55
E
Total
235 607.0
240 235.6
251.91
E
When the energy results calculated for hot water systems are analyzed, values between 17
811.1 18 046.1 kWh/year were obtained for both buildings. Hot water systems have been
approximately the same. However, greenhouse gas emission values are different since total
energy changes. Thus, greenhouse gas emission values also decreased due to the decrease in
heating energy need in the uninsulated condition. Results obtained according to TS-825 for the
uninsulated and insulated building are shown in Table 3.3. In case the building is insulated, the
heat lost from the external wall has decreased from 955.20 W/K to 439.69 W/K and the heat lost
from the ceiling has decreased from 532.53 W/K to 62.43 W/K. This also changed the heat loss
occurred through total conduction from the structure elements.
For the uninsulated building, the total heat lost through the conduction from the building
structure components was 4 354 W/K, while it decreased by 35% to 2 820 W/K for the insulated
building.
Table 3.2. Results of the energy identity certificate for the insulated building
Systems
Total
Consumption
Primary
Consumption
Consumption
per unit area
Class
Heating
141 151.7
142 800.1
149.74
C
Hot water
17 811.1
17 811.1
18.68
D
Air conditioning
771.61
1 598.9
1.68
E
Air ventilation
0.0
0.0
0.00
D
Lighting
1 434.27
2 971.8
3.12
B
Greenhouse Gas Emission
41.09
C
Total
160 832.24
165 181.8
173.21
E
As a result of the calculations, it is an important situation in terms of showing that the
insulation application reduces heat loss and shows that less energy will be used for heating
energy. When total energy consumption (Q) calculated per unit usage area for this building was
compared to the value (Q') in TS-825, the calculated annual heating energy need has been higher
Evaluations on the Energy Identity Certificate / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
110
than the maximum value specified in TS-825 since the Q> Q ' (120> 92.28 kW/m2) for the non-
insulated building as seen in Table 3.1. For this reason, this building was not found to comply
with the standards.
Table 3.3. Specific heat results obtained for insulated and uninsulated building according to TS-
825
Results obtained according to TS 825
For uninsulated
building
For insulated
building
Heat loss from the external walls
995.20 W/K
439.69 W/K
Heat loss from the roof
532.5 W/K
62.4 W/K
Total heat loss from building structure elements
4 354 W/K
2 820 W/K
The max. heat loss required according to TS 825 (Q')
92.2 kW/m²
92.2 kW/m²
Annual heating energy need per unit area
120 kW/m2
80 kW/m2
When a similar comparison is made within the uninsulated building, the calculated annual
heating energy need has been higher than the maximum value specified in TS-825 since Q> Q'
(120 > 92.28 kW/m2) as seen in Table 3.1. For this reason, this building was not found to comply
with the standards. When a similar comparison is made in the insulated building, since Q> Q '(80
<92.28 kW/m2) as seen in Table 3.2, the insulated building has been found compliant with the
standards because annual heating energy need calculated for the insulated building is below the
maximum required value. Note: In this calculation, the total heat transfer surface area was
calculated from the sum of heat transfer surface areas.
In Table 3.4, in the calculations made according to TS-825, the total heat transfer coefficient
(U) values of each structure element for the uninsulated building were compared. As can be seen
from this table, all total heat transfer coefficients were higher than the TS-825 max references.
This is the biggest indicator that the building needs improvement in terms of energy efficiency.
Here, UD: total heat transfer coefficient of the external wall UT: total heat transfer coefficient
of the ceiling Ut: total heat transfer coefficient of the floor, UP: it was expressed as total heat
transfer coefficient of the window. In Table 3.5, in the calculations made according to TS 825, the
total heat transfer coefficient (U) values of each structure element for the insulated building were
compared. As can be seen in this table, the results calculated according to TS-825 are almost
close to each other with the results obtained from the BEP program.
Table 3.4. The comparison of values of the total heat transfer coefficient (U) for the uninsulated
building (Konya, the 3rd Region of Turkey)
For uninsulated building
UD
(W/m².K)
UT
(W/m².K)
Ut
(W/m².K)
UP
(W/m².K)
Max reference values given in TS-825
0,5
0,3
0,45
2,4
Values calculated for uninsulated
building according to TS-825 and
increase percentage compared to the
max reference values of TS-825
1.95
(% 290)
1.26
(% 320)
1.80
(% 300)
3.30
(% 38)
Values calculated with BEP-TR 2
program and the increase percentage
compared to the max reference values
of TS-825
1.26
(% 152)
1.95
(% 550)
1.83
(% 307)
3.30
(% 38)
K. Bilen, E. Urmamen, M.T. Topcu, I. Solmaz / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
111
Table 3.5. The comparison of values of the total heat transfer coefficient (U) for the insulated
building (Konya, the 3rd Region of Turkey)
For uninsulated building
UD
(W/m².K)
UT
(W/m².K)
Ut
(W/m².K)
UP
(W/m².K)
Max reference values given in TS-825
0.5
0.3
0.45
2.4
Values calculated for uninsulated
building according to TS-825 and
increase percentage compared to the
max reference values of TS-825
0.56
(% 12)
0.35
(% 17)
1.88
(% 318)
3.30
(% 38)
Values calculated with BEP-TR 2
program and the increase percentage
compared to the max reference values
of TS-825
0.56
(% 12)
0.35
(% 17)
1.93
(% 329)
3.30
(% 38)
As seen in Table 3.5, the results calculated according to TS-825 and the results obtained from
the energy identity certificate (BEP) were close to each other.
4. EVALUATIONS AND DISCUSSIONS
In this study, the energy performance for the building consisting of a block including 10
apartments belonging to Selcuklu district of Konya was obtained with the BEP-TR program and
the results and the suggestions are given below,
Within the scope of this study, energy certificate results were calculated for the insulated and
uninsulated states of a building in Konya and in the comparison, it was seen that the results
directly affect the energy certificate class.
In line with the study, different results were obtained in terms of energy efficiency in
insulated and uninsulated states of the same building. The building insulation feature was
considered as the main factor in being different these results from each other. Especially in
heating and cooling values, considering that Konya province is located in the 3rd Region and has
a continental climate, it has been observed that the insulation application for the sample building
positively affects the energy efficiency results [13].
5. RESULTS
After building energy performance evaluations for a building consisting of a block containing
10 apartments in Konya province, the energy class for the insulated form of the building has been
determined as "Class C" whereas the energy class for the uninsulated form of the same building
has been determined as "Class E". This result indicates that the Energy Identity Certificate class
of the insulated building is Class C, that is, it is included in the scope of an acceptable building in
energy classification, and that the Energy Identity Certificate class of the uninsulated building is
Class E, that is, it is included in the scope of an unacceptable building in the energy classification.
There are also significant differences in the energy performance results for the insulated and
uninsulated states of the building. This result is an indication of how insulation changes directly
the building energy class in buildings.
In accordance with the obtained results, the energy identity of the building was determined
and thus, after determining the energy identity of the building, it was showed how the insulation
of the building contributes in terms of energy saving and energy efficiency.
For the uninsulated state of the building, the total heat transfer coefficient (U) of the structure
elements of the building using BEP-TR 2 was higher 152% on the external walls, 550% on the
Evaluations on the Energy Identity Certificate / Sigma J Eng & Nat Sci 11 (1), 103-113, 2020
112
ceiling, 307% on the floor and 38% on the windows than the max value that should be and that
specified in TS-825.
In the insulated state, the total heat transfer coefficient (U) of the structure elements of the
building using BEP-TR 2 was higher 12% on the external walls, 17% on the ceiling, 329% on the
floor and 38% on the windows than the max value that should be and that specified in TS-825.
These values are relatively close to the specified values.
In case of insulation to the building, the total heat loss has decreased from 4 354 W/K to 2
850 W/K compared to the uninsulated one, thereby resulting in a 32.2% reduction.
It has been seen how the insulation has an important effect in determining the energy identity
certificate. However, during the analysis evaluation of the building for the BEP-TR program, it
showed how appropriate the results of the program would be to TS-825 and the accuracy of the
results obtained from the program.
The results obtained from the BEP-TR program showed that approximately similar results
were obtained with the results calculated from TS 825, which it is an indication of how accurate
the program predicts.
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Article
Full-text available
This paper aims to draw a general picture of the simplified software for calculation building energy performance based on Turkish Regulations called BEP-tr.v2, which was released at the end of 2017. Even the tool has a simplified calculation methodology, the discussion in this paper is going to be focused on assessing the accuracy of the tool by test cases. The assessing procedure for the tool has two steps. In the first step, box type cases are analyzed, and the results are compared with the results of a detailed energy simulation tool (BES) to perceive the percentage of deviations. In the second step, a current building is selected to use as a test case. The model results are compared with the real consumptions of the building to see the convergence rate of the tool (Bep-TR2). The results showed that the net energy calculation procedure of the methodology needs to be improved.
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