http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
진공펌프 기반 기체분리막 제습장치의 제습 및 에너지 성능에 대한 실험적 연구
천성용(Seong-Yong Cheon),조혜진(Hye-Jin Cho),조수영(Su-Young Jo),이규배(Gyu-Bae Lee),정재원(Jae-Weon Jeong) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
In this work, the dehumidification and energy performance of a vacuum-based membrane dehumidifier for an air conditioning system were evaluated experimentally. The prototype was tested on the dehumidification characteristic (i.e., humidity ratio difference, moisture removal rate, and dehumidification effectiveness) and the energy performance (i.e., coefficient of performance) under various air conditions. The air conditions for evaluating the dehumidification performance were selected on three parameters: air temperature, air humidity, and air velocity. The experiment results showed that the vacuum-based membrane dehumidifier dried the air without temperature change, and the overall dehumidification performance of the prototype showed that the humidity ratio difference was range from 3.8 g/kg to 14 g/kg, the moisture removal rate was range from 0.12 kg/h to 1.0 kg/h, the dehumidification effectiveness was range from 36% to 81%, and the COP was range from 0.08 to 0.48 respectively. The parametric analysis showed that the dehumidification performance (i.e., the humidity ratio difference and the moisture removal rate) and energy performance was significantly affected by the inlet humidity ratio and the airflow rate. The main effect parameter of dehumidification effectiveness was the airflow rate.
기체분리막 제습이 적용된 외기전담시스템의 에너지 성능 분석
천성용(Seong-Yong Cheon),변유석(Yoo-Suk Byon),이수진(Soo-Jin Lee),정재원(Jae-Weon Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
A vacuum membrane dehumidifier-assisted dedicated outdoor air system (VMD-DOAS) is proposed and its energy performance is investigated by detailed energy simulation. The dehumidification performance and operation energy consumption of the proposed system were compared with two conventional dedicated outdoor air systems; the DOAS assisted by the cooling coil (Reference A) and the DOAS with desiccant wheel (Reference B). The result shows that the average coefficient of performance of studied systems was 1.98 in the VMD-DOAS, 2.70 in Reference A, and 1.73 in Reference B and the average latent cooling ratio of studied systems was 1, 0.43, and 0.25, respectively. Although the coefficient of performance of the VMD is lower (or similar) than Reference cases, the energy consumption of the VMD could be reduced as its latent heat ratio (energy convergence ratio of total to latent energy for dehumidification) is higher than Reference cases. Also, reheating coil energy can be reduced by preventing the overcooling process as the isothermal dehumidification process of the VMD. The dehumidification energy consumption of the VMD was reduced. Consequently, the proposed system reduced the total annual operation energy by 40.5% compared with Reference B and by 21.8% compared with Reference A.
진공펌프 기체분리막을 이용한 제습증발냉각 외기전담시스템의 에너지 성능 평가
천성용(Seong-Yong Cheon),조혜진(Hye-Jin Cho),이수진(Soo-Jin Lee),정재원(Jae-Weon Jeong) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study proposes a vacuum membrane dehumidifier and evaporative cooling-based dedicated outdoor air system to estimate the energy performance by a simulation study. The annual energy consumption of the proposed systems was compared with two Reference cases as conventional dedicated outdoor air systems; a DOAS with a desiccant wheel (Reference A) and a DOAS with a wet cooling coil (Reference B). The proposed DOAS deals with latent and sensible cooling separated by a vacuum-based membrane dehumidifier, which dries air with an isothermal process. The result shows that the annual average coefficient of performance of studied systems was 3.34 in the proposed system, 2.35 in Reference A, and 2.43 in Reference B. In summer, the average coefficient of performance of studied systems was 2.79 in the proposed system, 0.59 in Reference A, and 0.86 in Reference B, which is 4.73 and 3.24 higher than Reference A and Reference B. Because the proposed system is a decoupled sensible and latent cooling system using vacuum-based membrane dehumidifier and free cooling system (evaporative cooling), it is not required a thermally unwanted cooling and heating process; regeneration heat in Reference A and overcooling then reheating process in Reference B. Consequently, the proposed system reduced the total annual operation energy by 72.0% compared with Reference A and by 39.3% compared with Reference B.
천성용(Seong Yong Cheon),임한솔(Han Sol Lim),조혜진(Hye Jin Cho),강용권(Yong Kwon Kang),정재원(Kyo Shin Joung) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
Thermoelectric module (TEM), non-vapor-compression heat pumps, are of interest as substitutes for conventional vapor-compression heat pumps. However, the heat exchange effectiveness and performance of TEMs for application to heating, ventilation, and air conditioning (HVAC) systems had been less studied. The purpose of this research is to propose the system configuration of TEM heat pump unit and to predict the heat exchange effectiveness in air heat pump system using TEM. The proposed system is composed by flat plate fin array that is heat exchanger integrated TEM for cooling and heating. The experiments were conducted to predicting the cooling and heating heat exchange effectiveness by collecting performance data. The performance data are composed by the inlet air fluid temperature, air flow rates at each side, heat exchange area, and input direct current (DC) to the TEM. Outlet fluid temperatures and TEM surface temperature are also measured for deriving the heat exchange effectiveness. Design parameters had significant impact on the heat exchange effectiveness of the flat plate heat exchanger integrated TEM for air cooling and heating. Consequently, in this paper, the influence of the five input parameters (air temperature at both side, air flow rate at both side, current) were analyzed. In proposed unit, the heat exchange effectiveness of hot and cold sides was 0.41 to 0.59 and 0.23 to 0.30, respectively
축열재 일체형 열전소자 적용 천장 복사 냉방 패널의 에너지 성능 분석
강용권(Yong-Kwon Kang),천성용(Seong-Yong Cheon),정재원(Jae-Weon Jeong) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
This study proposes a phase change material based radiant cooling panel with thermoelectric modules (PCM-TERCP) and evaluate its performance characteristics during melting process of phase change materials in designed condition. The PCM-TERCP consists of phase change materials (PCMs), thermoelectric modules (TEMs) and aluminium panels. TEMs operate to freeze the PCM, and PCM stores the cooling thermal energy to maintain the constant surface temperature of the panel for radiant cooling. The main purpose of thermal energy storage systems is shifting the cooling season’s electricity consumption from day-time to night-time. Therefore, PCM-TECRP can implement the off-peak operation and it is expected that energy can be saved. Therefore, we constructed the mock up model of PCM-TERCP to identify the factors that affect the discharging process of PCM-TERCP. The mock up model of PCM-TERCP was made of top aluminium panel with three TEMs attached on the upper surface of the top panel, and a heat sink was attached on the hot side of each TEM to remove the heat, and two PCM pouches were installed between top and bottom panel. In addition, the melting temperature of PCM and target surface temperature of bottom panel were designed to be 16℃. Also, the room temperature was set to be 24℃. As a result, radiative cooling was operating a temperature range of 16-20℃ for 3 hours.
중공사막 잠열교환소자 적용 환기시스템의 운전 및 에너지 성능에 대한 실험적 연구
조혜진(Hye-Jin Cho),천성용(Seong-Yong Cheon),김범준(Beom-Jun Kim),이수진(Soo-Jin Lee),정재원(Jae-Weon Jeong) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
This study purposed to experimentally investigate the seasonal operating and energy performance of a hollow membrane latent heat exchanger-assisted ventilation unit. The proposed ventilation unit was fabricated, and the experiments was conducted based on the test standards for the energy recovery ventilator addressed from air-conditioning, heating and refrigeration institute (AHRI). In addition, the seasonal operation modes for the proposed ventilation unit were suggested . The measured data showed that the average sensible effectiveness, the average latent effectiveness, and the average enthalpy effectiveness of the proposed ventilation unit are 74.9%, 73.1%, and 76.1% in mode 1; 53.6%, 74.9%, 89.6% in mode 2; 80.6%, 68.1%, 78.1 % in mode 3. In addition, in case of energy performance, the proposed ventilation unit exhibited coefficient of energy (COE) of 31.5 in mode 1, 8.4 in mode 2, and 17.9 in mode 3, which satisfying the minimum requirement addressed in the energy recovery ventilator test standard in Korea.
열전소자 기반 에너지 하베스팅 블럭의 건물외피 적용시 발전량 예측
변유석(Yoo-Suk Byon),천성용(Seong-Yong Cheon),황유진(Yujin Hwang),정재원(Jae-Weon Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
The purpose of this research is to predict annual electricity generation from the energy harvesting block when it is installed on exterior wall of a building. By incorporating thermoelectric generator and phase change material, the energy harvesting block can passively generate electricity from waste heat. Since exterior walls of buildings has waste heat that is accumulated in daytime and dissipated during night, which makes the waste heat on walls be unused, the energy harvesting block is installed on building walls to collect the unused heat. The experiment to evaluate the electricity generation was done according to the representative wall temperature ranges of summer, winter and of a day that has the biggest range. Experimental results showed that the electricity generation depended on the magnitude of the range and both summer and winter condition results showed 0.090 Wh of electricity generated for a day. Because a single energy harvesting block can generate 0.090 Wh of electricity, when the energy harvesting block is installed in a scale of 1 m2, total 5,810 Wh can be generated for a year.
액체식 제습 적용 외기전담시스템의 에너지 절감 효과 분석
고진영(Jinyoung Ko),천성용(Seong-Yong Cheon),이재희(Jae-Hee Lee),정재원(Jae-Weon Jeong) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
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 proposed system, the dedicated outdoor air system removes the total latent and ventilation load by a cooled liquid desiccant solution and the indoor air source heat-pump unit provides only the sensible cooling to the zone. As a reference system, an apartment with an ERV (Energy recovery ventilator) and air-source heat pump air conditioner was selected. The total energy consumption during the summer of an apartment house with the proposed system was compared with that of reference system which removes the whole sensible and latent load at the same time. The simulation was implemented by EES (Engineering equation solver). As a result, the apartment with the proposed system indicated 11.4% less total energy consumption than the reference case during the summer.