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사무실 건물을 대상으로 VRF-OPS 시스템과 RTU의 성능비교
이제헌(Jehyeon Lee),태상진(Sangjin Tae),김태덕(Taeduk Kim),임필재(Piljae Im) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The purpose of this paper is to compare the performance of both the RTU, which is widely used in small and medium sized buildings throughout the United States, and VRF system. The HVAC systems are installed at a test building located in Oak Ridge, and they operated for each system separately. It compared the performance of the part load when changing the room operating rate to 100%, 60%, and 40% for each system. As a result, the VRF system controlled the indoor temperature to a set-point and reduced the average daily energy consumption to 29.9%, 37.2%, and 46.6% at the respective room operating rate. Also, the COP was 35%, 31%, and 43% higher when using VRF system compared to RTU. The performance difference between both systems by the part load rate showed that the VRF system operated the highest COP 4.6 at the part load rate 65%. It tended to rapidly decrease under the part load rate 35%. Comparatively, the RTU system had a relatively small change in part load rate and operated about COP 3 in most part load rates.
동시냉난방 시스템 에어컨의 냉매량 변화에 따른 고낙차 장배관 운전 신뢰성 평가
이승찬(Seung-Chan Lee),김태안(Tae-An Kim),태상진(Sangjin Tae),정규하(Gyooha Jung),문제명(Jemyung Moon),김윤제(Youn-Jea Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
The heating and cooling performances of system multi-air conditioner for various refrigerant flow rates with high-head and long-line conditions are experimentally investigated. The maximum head and tube length were 110 m and 1000 m, and the two different adjustments of refrigerant flow rates were +20 % and -20 %, respectively. The experimental system was composed of 4 outdoor units with module systems, and 13 indoor units which were joined with the mode change unit by single-tube circuit. Field tests without indoor and outdoor temperature control were performed in a general office building with two different refrigerant flow rates. Especially, the oil level in the compressor was normally maintained at the safety zone. Experimental results were prepared on the p-h diagram.
수냉식 VRF 시스템 대상 설정값 제어 알고리즘 개발 및 효과 검증에 관한 연구
이제헌(Jehyeon Lee),송영학(Younghak Song),윤현진(Hyunjin Yoon),최동석(Dongsuk Choi),태상진(Sangjin Tae),김익근(Ikkeun Kim) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The purposes of this paper are to develop an algorithm and verify the effect of the algorithm to improve the efficiency of water-cooled VRF (Variable Refrigerant Flow) system. Set-points of cooling water flow rate and cooling water temperature were controlled in the field test in a commercial office building. In the cooling operation, the cooling water temperature was controlled according to the outdoor wet bulb temperature under the minimum water flow rate condition. In the heating operation, the cooling water temperature was decreased from 20℃ to 15℃ in order to reduce the steam cost which accounts for about 80% of the whole energy cost. According to the field test results, the energy consumption is reduced 11.5% and the system COP is improved 14.2% by applying the algorithm in the cooling operation. In the heating operation, algorithm operation uses 9.3% less energy than the normal operation, and the reduction effect of energy cost under the same outdoor condition is 32.6%.