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RISS 인기검색어
- 검색키워드
- 주제어 : Supply air temperature condition (검색결과 4 건)
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바닥취출 공조방식을 적용한 기존 공연장의 열환경 개선효과
황정하(Jung-ha Hwang),이용호(Young-ho Lee) 한국생활환경학회 2002 한국생활환경학회지 Vol.9 No.4
This study focused on the ceiling supply air conditioning system installed in auditoriums with 1,000 seats or less and analyzed, by means of computer simulation, the temperature and velocity distribution together with the predicted mean vote (PMV) of the occupancy zone. The existing ceiling supply air conditioning system has a nozzle air inlet in the ceiling through which air is released. This airflow exceeded the allowable velocity in the occupancy zone I meter above the floor surface, causing a draft. The indoor temperature was 24.7℃ when cooled, 1.3℃ lower than the set air temperature (SAT), and 25.5℃ when heated, 3.5℃ higher than the set air temperature. The Predicted Mean Vote (PMV) of the ceiling supply air conditioning system in the rear seating area of the first floor where the ceiling is relatively low was -0.1~-0.61 when cooled and -0.2~-0.53 when heated. These figures are than those within the comfort zone, indicating the presence of some level of discomfort. As means of improving the ceiling supply air conditioning system, this thesis investigated three systems: the floor supply air ceiling suction system (ALT-1), floor supply air wall suction system (ALT-2), and floor central supply air wall suction system (ALT-3). The most promising data were extracted from the floor supply air wall suction system (ALT-2), known for its superior performance in the thermal environment, when the existing cooling and heating system capacity was reduced by 50%. showed that the velocity distribution in the occupancy zone was within the allowable limit 0.14~0.24 ㎧ when cooled and 0.1~0.28 ㎧ when heated. These levels in the occupancy zone lie within the comfort zone.
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천장형 냉방기를 이용한 교실의 온열환경 개선에 관한 연구
황정하(Jung-ha Hwang),이용호(Yong-ho Lee),윤준진(Jun-Jin Yun) 한국생활환경학회 2006 한국생활환경학회지 Vol.13 No.1
The purpose of this study is to deduce the optimal operating plan for the classroom ceiling air conditioning system based on air supply variables at the time of cooling operation. To carry out this objective, measuring experiment and computational fluid dynamics (CFD) were performed with variables including supply air temperature, air supply volume and air supply angle of a ceiling air conditioning system. Based on a comparison of the results, classroom temperature and velocity distribution are analyzed, so the air volume distribution can be improved according to the heat generating load of the occupants. Ultimately, through the evaluation and analysis of the occupants' Predicted Mean Vote (PMV), an optimal operating plan for the summer is proposed. Room temperature and velocity distribution stayed in the most stable condition at the temperature setting of 26°C, air supply volume of 4320CMH, and air supply angle of 30°, With regard to the improvement plans based on the occupants' heat generating load, the air supply volume is reduced in the less populated front area, and raised in the more populated right and left sides of the room. Among the proposed improvement plans [ALT-3] in which the air supply volume is reduced by 40% in the front area and 20% at the south and north, exhibited the least difference in room temperature. The occupants' PMV stayed in the comfortable zone ± 1, and the occupants feel comfortable in the range of ±0.5 throughout the entire room.
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한도영(Doyoung Han),신승철(Seungchol Shin) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
In order to recover the heat from the exhaust air of a bio-cleanroom system, an air-to-air heat exchanger is generally used. Due to its lower heat recovery rate and higher maintenance cost, an air-to-air heat exchanger may be replaced by a heat pump. In this study, a heat pump is selected as the heat recovery unit for a bio-cleanroom. The indoor temperature control algorithm, which consists of a supply air temperature setpoint algorithm and a supply air temperature control algorithm, was developed by using a fuzzy and proportional-integral logic. In order to identify the effectiveness of the control algorithm, the standard regulation performance test and the indoor thermal load step change test were performed. Test results showed that the control algorithm was appropriate for the control of an indoor temperature. Therefore, it may be concluded that the indoor temperature control algorithm developed for this study may be effectively applied for the control of the indoor temperature of a bio-cleanroom heat pump air conditioning system.
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모듈러 데이터센터 냉각시스템의 취출온도 조건에 의한 연간에너지 소비량 예측
정용호(Yong-Ho Jung) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.1
The modular data center is greatly influenced by operating conditions because its internal size is smaller than the existing hyperscale data center. The recent emergence of servers that can adapt well to indoor temperature rise requires a review of existing temperature conditions. In this study, the potential for temperature condition mitigation and annual energy performance were analyzed for recent installations of improved thermal performance servers in container-type distributed modular data centers. According to the analysis, the upper dry bulb temperature of the intake air for maintaining the recommended level, acceptable level A1, and acceptable level A2 was 14℃, 16℃, and 19℃ respectively. The annual energy savings predicted in the analysis was 3.1% and 9.2%, when the intake air temperature of the servers in the modular data center was mitigated to the A1 and A2 levels respectively.
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