Jae-Weon Jeong

• Ph.D.
• Professor at Hanyang University

The SARS‐CoV‐2 pandemic has highlighted the importance of maintaining a healthy indoor environment, particularly in healthcare facilities where strict infection control is essential. Airborne infection isolation rooms (AIIRs) are designed to isolate infectious patients and prevent the spread of airborne pathogens. However, additional microbial cont...

As the Artemis program advances the development of a lunar habitat, ensuring thermal stability within the habitat emerges as a critical component of space exploration. Given that the Moon's lack of atmosphere makes solar radiation the dominant factor in its extreme thermal environment, causing significant heat loads due to drastic temperature fluct...

Recently, there has been a significant increase in global demand for space missions and space research. One of the primary goals of these missions and research efforts is to develop and utilize rare lunar resources, necessitating the development of a manned lunar habitat. Despite development of the manned habitat is essential, the extreme temperatu...

Indoor humidity control is increasingly important because indoor sensible heat ratio decreases to reduce building energy consumption. However, reference vapor compression cooling systems exhibit energy inefficiency and limitations in maintaining indoor thermal comfort. Therefore, this study proposes an alternative heat-pump- driven liquid-desiccant...

Recent development in space exploration, driven by NASA's Artemis program, have revitalized the focus on manned space exploration. One of the important challenges for the development and settlement of manned space is to maintain a stable internal thermal environment of manned space habitats, which is essential technology for sustainable space explo...

This paper aims to analyze optimal resolution for energy consumption data to improve data-driven building energy consumption diagnosis with the ASHRAE change point model. A 9-floor office building is selected as a target, and hourly data is measured throughout a year. Heating, cooling, and other types of energy consumption are measured separately,...

The purpose of this study is to analyse the proposed liquid desiccant absorber with low solution flow rate compared with the conventional packbed-type absorber. The total exergy destruction and exergy efficiency were estimated to assess the system performance. To determine the total exergy destruction and exergy efficiency, it was predicted that th...

As energy saving emerges as a critical factor for the sustainable development of humankind, the importance of Zero-Energy Buildings (ZEB) is gradually increasing. Therefore, much research is being conducted on high-efficiency renewable energy technologies that can be applied in urban areas. However, increasing the efficiency of BIPV were proposed a...

Zero-energy buildings have been mandated in many countries to reduce carbon emissions from buildings. Existing buildings are no exception, and should be retrofitted with renewable energy to be ZEBs. Fuel cells are attracting increasing attention owing to their high efficiency and lack of limitations on the installation area compared to photovoltaic...

An appropriate design strategy suitable for the purpose of a building should be considered to apply a cascade heat pump system for multiple functions to buildings. The purpose of this study is to propose a sizing process and evaluate a capacity calculation simulation of air-to-air/water cascade heat pump systems applied in residential buildings tha...

Thermoelectric technology has been developed as a substitute for existing refrigerants in heating, ventilation, and air-conditioning system applications for building decarbonization. A hydraulic thermoelectric radiant cooling panel (hTERCP) operated based on the Peltier effect can alternate a conventional cooling system using a chiller with refrige...

The objective of this study was to quantify the influence of ventilation methods on children's exposure to indoor particles in a daycare center located in an urban area. The ventilation methods applied to the center were monitored for 1 year. It appears that indoor PM10 and PM2.5 concentrations of the center were basically determined by outdoor con...

Building-integrated photovoltaics (BIPVs) are the most promising systems for net-zero energy buildings. However, there are few practical cases because of shortcomings, such as the lack of solar tracking and the rapid rise in PV surface temperature. Therefore, methods of increasing the efficiency of BIPVs have been proposed and studied. These includ...

Vacuum-based membrane dehumidifiers (VMDs), an emerging air dehumidification technology, use selective membranes to remove moisture from humid air; these dehumidifiers have the potential to save energy and enhance thermodynamic efficiency through decoupled latent and sensible cooling. In this study, a prototype of a vacuum-based membrane dehumidifi...

With the recent development of the independent control of temperature and humidity, the demand for dehumidification has significantly increased, and liquid desiccant dehumidification systems have attracted considerable attention because of a high dehumidification efficiency. This study presents a new design for a liquid desiccant dehumidification s...

Smart sensors in buildings require independent power supplies to measure the built environment data. To supply electricity to these smart sensors, an enhanced concept of a thermoelectric generator-assisted energy harvesting block was established in this study. An energy block comprising thermoelectric generators and phase change materials can conve...

In this study, a hollow fiber membrane-based dual-core ventilation system is proposed to reduce space heating and cooling energy requirements. Simple prediction models were developed for the seasonal latent heat exchange performances of the proposed system. A mock-up model of the hollow fiber membrane module that serves as a latent heat exchanger i...

The energy consumption of the air-source heat pump operated in cooling mode is affected by the outdoor air condition in summer. It is important to not only install the evaporative cooler in front of the condenser inlet side but also consider the operation strategy of the evaporative cooler under the hot and humid condition. In this study, the energ...

This paper purposed to develop a simplified model for a vacuum membrane dehumidifier in an air conditioning system. The proposed model is a gray model that uses mathematical equations that are deducted from the effectiveness and number of the transfer unit of the heat exchanger and a regression equation for the ratio of humidity capacities (X facto...

The COVID-19 pandemic has led to increasing interest in controlling airborne virus transmission during the operation of air-conditioning systems. Therefore, beyond an examination of the ability of liquid-desiccant material itself to inactivate microbes, a heat-pump-driven liquid-desiccant air-conditioning system was proposed and constructed to expe...

Liquid-desiccant-assisted air conditioning systems have attracted considerable interest owing to their potential to save energy and enhance performance through decoupled control of latent and sensible loads. In addition, several studies have suggested using the regenerator of a liquid desiccant system for humidification during the heating season; h...

The main purpose of this study is to experimentally evaluate the energy and economic benefits of an organic Rankine cycle (ORC) based liquid desiccant (LD) assisted air conditioning system (ORCLD) for building applications. A district heating network was used as the heat source of the ORC, and the heat and power generated from the ORC was provided...

In this study, an air-to-air type hollow fiber composite membrane latent heat exchanger was built and its latent heat exchange characteristics were experimentally investigated under various test conditions. Based on experiments conducted on four prototypes, polyethersulfone with 9 wt% of polyvinyl-pyrrolidone was selected as the membrane material s...

This study investigates the dehumidification and energy performance of central ventilation systems based on a liquid desiccant-assisted dedicated outdoor air system applied to an apartment residential building. This heat-driven central ventilation system should receive heat energy because of regenerating the liquid desiccant. An organic Rankine cyc...

Owing to the economic recession due to the Coronavirus disease (COVID-19) pandemic, energy-efficient building retrofitting has been considered as an integrated solution to recover the economy and maintain global greenhouse gas reduction. As part of retrofitting existing building-integrated photovoltaic systems during building renovations, this stud...

As the coronavirus pandemic has brought about global economic recession and reduction in greenhouse gas emissions, energy efficient building retrofitting has become a comprehensive solution to increase the employment rate and reduce the energy consumption of buildings. This situation requires more energy-efficient integrated generation systems. In...

A compact heat-pump-driven liquid-desiccant air-conditioning unit for residential buildings is proposed and constructed to validate its energy and air-conditioning performance experimentally. By composing the system with one set of providing the decoupled control of annual sensible and latent loads, the proposed system would contribute to the resid...

This paper proposes a methodology to derive a black-box model that can predict equivalent melanopic lux (EML) using photopic illuminance as the input. Using this black-box model, we change only the algorithms for existing buildings equipped with controlled lighting based on photopic illuminance. This enables daylight control to satisfy the required...

Photovoltaics are methods used to generate electricity by using solar cells, which convert natural energy from the sun. This generation makes use of unlimited natural energy. However, this generation is irregular because they depend on weather occurrences. For this reason, there is a need to improve their economic efficiency through accurate predic...

Due to the energy consumption issue, pre-heaters in energy recovery ventilators have not been installed mandatorily in Korean apartments. However, to keep comfortable indoor environment quality, it is important to prevent condensation and frost occurrence in an energy exchanger core, since those problems can cause fungus growth. This study suggests...

The objective of this research was to experimentally analyze the cooling performance of a phase-change material-integrated thermoelectric radiant cooling panel (PCM–TERCP) under active and passive cooling operation modes. Empirical models were derived for the PCM–TERCP to provide the available cooling capacity, duration time, and electric power con...

The objective of this study was to modify an existing liquid desiccant and indirect/direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS) for humidification operation in winter. The energy benefit of the liquid desiccant-assisted humidification approach during the operation of LD-IDECOAS over the conventional method with a steam...

This study evaluates the energy-saving potential of a prediction model-based pre-heat coil operation method for frost prevention in energy recovery ventilators, compared to existing approaches. Energy recovery ventilator (ERV) requires pre-heating of the incoming outdoor air to prevent undesirable condensation and frost formation in the enthalpy ex...

With the rapid industrialization and urbanization, suburban areas have been developed to accommodate the sudden demand of the population. However, recent problems such as low fertility and aging induces urban shrinkage by reducing the urban population and the economy in old areas around the suburbs. As urban shrinkage causes inequality among reside...

In this study, two workable designs of a heat-pump-driven liquid desiccant (HPLD) airconditioning system were proposed for residential buildings. The proposed HPLD systems were designed to work as a multi-functional airconditioning system without additional equipment which would solve the low practicality due to the large scale and complexity of th...

The energy and operating performances of a vacuum membrane dehumidification system were theoretically investigated for building air conditioning applications. The dehumidification effectiveness and coefficient of performance (COP) were adopted as performance indices. A one-dimensional mass-transfer model was derived to analyze the effect of each op...

As a novel energy-conservative ventilation system for buildings, a dedicated outdoor air system (DOAS) assisted by a vacuum-based membrane dehumidifier is proposed, and its energy performance is investigated via detailed energy simulations. The vacuum-based membrane dehumidifier dries the air by an isothermal process, which is difficult to realize...

Herein, we discuss the design and evaluation of a passive electricity generator, which we call an energy-harvesting block. The energy-harvesting block is a thermoelectric generator-based passive energy-harvesting system integrated with a phase change material that is designed to harvest energy from waste heat on the exterior walls of buildings. The...

Microorganism contamination in air conditioning systems can cause respiratory diseases in building occupants. This study aims to evaluate and predict the performance of an in-duct ultraviolet germicidal irradiation (ID-UVGI) system to reduce the microorganisms that can grow in the liquid desiccant and indirect/direct evaporative cooling-assisted 10...

The purpose of this paper is to investigate energy generation performance of thermoelectric generator and phase change material assisted building integerated photovoltaic (BIPV-TEG-PCM) module. The proposed system can reduce solar cell temperature and increase generation efficiency of photovoltaic via cooling from phase change material. In addition...

The main aim of the study is to develop a temperature model for pre-heat coil operation in energy recovery ventilator regarding energy consumption. Due to the concern about redundant energy consumption of pre-heat coil, the proposal for installing pre-heat coil in energy recovery ventilator and its operation temperature was withdrawn in Korea, whic...

The objective of this study was to propose and obtain a workable design of a phase change material integrated thermoelectric radiant cooling panel (PCM-TERCP) through numerical and experimental investigations of thermal performance. The proposed PCM-TERCP consists of thermoelectric modules (TEMs), heat sinks, insulation, and PCM layer between two a...

In this paper, an energy-harvesting block is proposed, which consists of a thermo–electric generator (TEG) and phase-change material (PCM). The proposed block generates electricity by utilizing the waste heat accumulated at the exterior wall surface. To maximize the power generation by maintaining the temperature difference between the hot and cold...

The main goal of this study is to evaluate the energy saving potential of a liquid desiccant-assisted dedicated outdoor air system applied in an apartment. Not to use an additional regenerator fan, a retrofit of a liquid desiccant-assisted dedicated outdoor air system with the exhaust air-side regenerator was proposed. In an apartment with the prop...

The manual control of windows is one of the common adaptive behaviours for occupants to adjust their indoor environment in homes. The cross-ventilation by the window opening provides a useful tool to control the thermal comfort and indoor air quality in homes. The objective of this study was to develop a modelling methodology for predicting individ...

In this study, the organic Rankine cycle (ORC)-based combined heat and power (CHP) system was developed and experimentally investigated to assess the feasibility of the application potential as an energy-efficient CHP system. This system harvests electrical energy from an unused district heat source and simultaneously provides heating for a liquid...

This study aims to estimate the energy performance of a liquid desiccant and evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS) combined with a thermoelectric module integrated proton exchange membrane fuel cell (TEM-PEMFC). During the cooling season, recovered heat from the PEMFC was reclaimed to heat a weak desiccant solution and t...

Building heating, ventilating, and air-conditioning systems have high impacts on the energy and environmental performance of residential buildings. To reduce the energy consumption of the building for sustainable buildings and cities, this research proposed the organic Rankine cycle (ORC) applied to a centralized liquid desiccant (LD) and evaporati...

The purpose of this study was to compare the number of condensation occurrences and the required pre-heat coil capacity according to type of energy recovery ventilator (ERV) and the difference of latent effectiveness in the ERVs. Because of revised ventilation regulations, buildings in Korea have been required to install mechanical ventilation syst...

The purpose of this study is to investigate the suitable operation and performance of a thermoelectric radiant panel (TERP) in the heating operation. First, the hypothesis was suggested that the heating operation of TERP can operate without a heat source at the cold side according to theoretical considerations. To prove this hypothesis, the thermal...

Although Korean government tried to enact the law about mandatory pre-heat coil installation in Energy Recovery Ventilator (ERV), the plan was withdrawn due to the concern about excessive energy consumption. Therefore, the other alternative concerning real-time climate difference and effectiveness difference about the pre-heater regulation has been...

This study evaluated the effect of an organic Rankine cycle (ORC), powered by various renewable heat sources, on enhancing the primary energy benefits in a liquid desiccant (LD) and indirect and direct outdoor evaporative cooling-assisted air system (LD-IDECOAS). Combining an LD-assisted air conditioning system with the ORC, which uses renewable or...

This study aims to investigate a principle and strategy for thermoelectric radiant panel (TERP) heating operation using numerical and experimental methods. A numerical simulation model for a TERP was developed based on the finite difference method. Additionally, a mock-up TERP model was constructed to validate the numerical model and define its ope...

Performance simulations of thermoelectric radiant panels (TERPs) provide valuable information for the use of TERPs as alternatives to conventional hydraulic radiant panels, which require refrigerants based on the vapor compression cycle. Several existing models are appropriate for the design of the TERP; however, there are limitations to the buildi...

This paper proposes a dedicated outdoor air system (DOAS) with thermoelectric radiant panels (TERPs) for high-speed train cabins that prevents air quality problems and reduces operation energy consumption. The DOAS supplies cooled and dehumidified outdoor air for ventilation and the removal of latent loads. The cooling and heating loads can be acco...

A phase change material based radiant cooling panel with thermoelectric module (PCM-TERCP) is proposed in this study. It consists of two aluminium panels, and phase change materials (PCMs) sandwiched between the two panels. Thermoelectric modules (TEMs) are attached to one of the aluminium panels, and heat sinks are attached to the top side of TEMs...

The purpose of this research is to evaluate the performance of a novel model that incorporates a thermoelectric generator (TEG) and phase change material (PCM). The proposed model passively generates electricity using waste heat that accumulates at exterior wall surfaces. The main generator is a TEG. To maintain the temperature difference between t...

The main purpose of this research is to analyze and compare the energy performance of two different novel air conditioning systems; one is a dedicated outdoor air system (DOAS) with a parallel system and the other is a heat-pump-integrated liquid-desiccant and evaporative-cooling-assisted 100% outdoor air system (HPLD-IDECOAS). It was assumed that...

The purpose of this study is to analyze the heat flux difference and examine applicability of heat flux sensor along with various sensor attachment methods. Using multiple sensors and various tapes, KS F 2278 thermal test was performed in hot/cold chamber with standard panel specimen. The measured heat flux values of sensors were stable. But values...

In a liquid desiccant dehumidifier, the air-to-solution flow direction plays an important role in the dehumidification performance and the physical size of the dehumidifier tower. In this research, the dehumidification performance of counter-flow and cross-flow liquid desiccant dehumidifiers were compared via a series of experiments carried out in...

Recently, a package unit of liquid desiccant and an indirect and a direct evaporative cooling-assisted 100% outdoor air system (LD-IDECOAS) has been proposed. In this system, the amount of heating energy consumed to regenerate the desiccant solution is significant and should be reduced to achieve better energy conservation than that of a convention...

The main objective of this study is to investigate the indoor air quality enhancement performance of two different liquid desiccant and evaporative cooling-assisted air conditioning systems, such as the variable air volume (VAV) system with the desiccant-enhanced evaporative (DEVap) cooler, and the liquid desiccant system with an indirect and direc...

The main objective of this research is to propose a dedicated outdoor air system assisted by a thermoelectric heat pump, and to evaluate the operating energy performance of the proposed system compared with a reference system. The proposed dedicated outdoor air system consists of an enthalpy wheel, a desiccant wheel, and the thermoelectric heat pum...

The purpose of this study is to investigate the effect of the inlet solution temperature on the performance of an adiabatic cross-flow regenerator using a lithium chloride (LiCl) aqueous solution, and to propose the optimal inlet solution temperature when operating this type of regenerator. In the experimental tests, the inlet solution temperature...