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사무소건물 중앙공조시스템의 에너지 사용량을 예측하기 위한 시뮬레이션 기법의 개발
김주욱(Kim Joo-Wook),박재형(Park Jae-Hyung),정정화(Jeong Jeong-Hwa),송두삼(Song Doosam) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(계획계)
HVAC system is used a lot of energy in office building. Almost of the office building adopt the Central equipment based AC, because it is easy to manage. There are many simulation tool available to analyze whole building performance such as DOE2, eQuest, TRNSYS, Energyplus etc. However, in case of accomplishing building energy simulation for central equipment based air-conditioning system, many parameters as like HVAC system configuration and performance data and control logics are needed. By this reason, the energy performance simulation for central equipment based system is rare. In this study, the method to analyze the energy performance of central equipment based system using TRNSYS will be proposed. The simulation method will be verified by comparison between measurement result and simulation result.
Economizer cycle을 채용한 전열교환형 환기시스템의 에너지 절감 효과 분석 : 국내 학교를 대상으로
김주욱(Joo Wook Kim),박재형(Jae Hyung Park),송두삼(Doo Sam Song),주의성(Euy Sung Chu),권영철(Young Chul Kwon) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Maintaining an IAQ with fresh in school building is very important because the good IAQ can be possible to improve the academic performance. Since school buildings are very dense and require a lot of fresh air, the need for ERV(Energy Recovery Ventilator) has become obvious. While opening a window does provide ventilation, the building's heat and humidity will then be lost in the winter and gained in the summer, both of which are undesirable for the indoor climate and for energy efficiency. ERV technology offers an optimal solution: fresh air, better climate control and energy efficiency. However, when the outdoor air condition is favorable to control the indoor environment such as spring and autum in Korea, heat exchange in ERV would rather increase the cooling load than diminish. Economizer cycle control which using the outdoor air in controlling the indoor thermal environment has many benefit in terms of energy saving and IAQ control. In this study, the ERV with economizer cycle control will be suggested. And then the system control characteristics and energy saving effect will be analyzed through the TRSNSYS Simulation.
국내 건물의 성능기준 변화를 고려한 냉방시스템 용량 산정 기준의 적정성 분석
김주욱(Joo Wook Kim),송두삼(Doo Sam Song) 대한설비공학회 2019 설비공학 논문집 Vol.31 No.2
According to the latest building energy conservation policy in Korea, the thermal performance standard of building envelope (u-value) in central region has been enhanced by 43% compared to the standards established in 2001. Also, the air-tightness of building envelope in these days has been improved by 83% to that of the built in 2001. As the building thermal performance improved, the cooling load of buildings decreased sharply. However, the KS standard for sizing capacity of air conditioner (KS C 9306) dose not take these changes into consideration. In this study, the changes of cooling capacity according to the changes of building thermal performance was analyzed. TRNSYS simulation was accomplished to analysis the cooling capacity for the analyzed cases in this study. The result showed that the cooling capacity based on the KS standard is about 38% higher than the cooling capacity based on the current building thermal performance.
박재형(Jae Hyung Park),김주욱(Joo Wook Kim),두삼(Doosam Song) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The purpose of this study is to investigate the cooling load removal performance of radiant floor cooling system. In this study, the heat transfer coefficient of radiant floor cooling system such as convective heat transfer rate and radiant heat transfer rate were analyzed with literatural review and experiment. Also the cooling load removal performance were calculated. The result of this study will be used to calculate the size of the radiant floor cooling system.
외기냉방기능을 가지는 전열교환형 환기시스템의 에너지 절감효과의 분석
박재형(Park Jae-Hyung),김주욱(Kim Joo-Wook),정정화(Jeong Jeong-Hwa),송두삼(Song DooSam) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(계획계)
Most of school are equipped with system air-conditioner and energy recovery ventilator. Energy recovery ventilator has limitation in collecting energy when it is not needed only to cause extra energy need for ventilation, though it is an innovative energy-saving ventilation system that collects heat energy loss during ventilation and provide that again to indoor. Therefore, this study suggests ERV with economizer cycle system for school facilities. TRNSYS simulation has been used to analyze control characteristics of system and energy-savings compared to previous system.
이예지(Ye Ji Lee),김주욱(Joo Wook Kim),송두삼(Doo Sam Song) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.9
The purpose of this study is to analyze heating and cooling load variation due to envelope retrofits in an old school building. In a previous study, envelope retrofit of an old school building resulted in annual energy consumption reduction. However, cooling energy consumption increased with the envelope retrofit. This is because of high internal heat generation rates in school buildings and internal heat cannot escape through windows or walls when the envelope’s thermal performance improves. To clarify this assumption, thermal performance changes due to envelope retrofits were analyzed by simulation. Results revealed indoor temperature and inner window surface temperature increased with high insulation level of windows. Indoor heat loss through windows by conduction, convection and radiation decreased and resulted in an increase of cooling load in an old school building. From results of this study, energy saving impact of envelope retrofits in an old school building may not be significant because of high internal heat gain level in school buildings. In case of replacing windows in school buildings, local climate and internal heat gain level should be considered.
Economizer cycle control을 채용한 전열교환시스템의 에너지 절감효과 분석 : 국내 공동주택을 대상으로
박재형(Jae Hyung Park),김주욱(Joo Wook Kim),송두삼(Doo sam Song),윤호영(Ho Young Yoon),김성우(Sung Woo Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
ERV system has installed in almost newly constructed residential building in Korea. Heat recovery features of ERV can be possible to decrease the heating and cooling load caused by ventilation. However, in case of the outdoor condition is favorable to control the indoor air, the heat recovery function of ERV does more harm than good in term of cooling load. In this study, the ERV with economizer cycle control for residential building is suggested and the performance of the suggested system will be analyzed using TRNSYS.
실측과 시뮬레이션을 통한 건물 복사환경이 재실자의 온열쾌적감 및 에너지소비에 미치는 영향 분석
박소현(So Hyun Park),김주욱(Joo Wook Kim),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, the effect of thermal radiant environment according to building performance(thermal insulation and airtightness) on resident thermal comfort and building energy consumption was analyzed. As results of the field measurement, the operative temperature and PMV of perimeter zone were lower than interior zone in low thermal performance building. The percentage of occupants who wanted to increase the indoor temperature was 64% in that building. As results of the simulation, in the case of OT(Operative Temperature) control in low performance building, the PMV and PPD satisfied the comfortable range but the energy consumption increased by 40% compared to DBT(Dry-Bulb Temperature) control. Considering the results of the field measurement and simulation, it can be said that the low thermal comfort owing to the low building thermal performance can arouse the additional heating energy consumption in actual buildings.
박재형(Jae Hyung Park),김주욱(Joo Wook Kim),송두삼(Doosam Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
In this study, load decrease of Hybrid air-conditioning system utilizing convection and radiation is computed with calculus of heat load for designing that was presented. First, this study suggests the way to calculate efficiency to remove indoor load with a test that reviews the existing heat load calculus for designing. Second, the ratio of eliminating load of hybrid system is measured with the test and the load calculus proposed. Lastly, effects and features of decreasing indoor energy are compared with the current HVAC.