http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
인버터 스크롤 압축기를 사용한 멀티 에어컨의 냉방 특성에 대한 실험적 연구
권영철,고국원,진의선,허삼행,전용호,이영덕,박인규 대한설비공학회 2004 설비공학 논문집 Vol.16 No.4
In the present study, the cooling characteristics of the multi-air conditioner (A/C) using an inverter scroll compressor are experimentally investigated for the number of the indoor units and the operating conditions (20℃, 24℃, 26℃) under the cooling standard conditions by KS C 9306. In the case of the simultaneous operation for 3 indoor units, the cooling capacity, the mass flow rate and the input power have a decreasing trend and COP has an increasing trend, with decreasing the difference in the operating temperature of the indoor unit and the room temperature. In the case of the simultaneous operation for 2 indoor units, the COP of the indoor unit with large cooling capacity is high when the operating temperature is high, but the COP of the indoor unit with low cooling capacity is high when the operating temperature is low. In the case of the single operation for one unit, when the large cooling capacity of the indoor unit is less than 50% the compressor operates at the minimum operation frequency region and the COP decreases.
운전조건 변화에 따른 고체제습 냉방 시스템 모델 파라미터 연구
이율호(Yulho Lee),인정현(Junghyun In),강상규(Sanggyu Kang),박성진(Sungjin Park) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A desiccant cooling system can make a use of waste heat. The reusing of waste heat is one of the essential methods to conserve a using of grid electric energy and fossil fuel. Reducing an energy consumption of the cooling system in the summer season has an ability to avoid concentration of energy demands in the daytime. In this study, an on-design desiccant cooling system model is developed. A desiccant cooling system model is composed of a desiccant rotor, heat exchangers, an evaporative cooler, and blowers. A silica gel coated honeycomb rotor is adapted to the desiccant rotor model. A direct evaporative cooler model is applied to the system. The parameters: outdoor air temperature, outdoor humidity, regenerative heat duty, air flow rate, indoor heat duty are studied to analyze the effects on cooling capacity, Coefficient Of Performance (COP), and demand of regenerative heat duty.
3실 에어컨 냉방 및 초기기동 특성에 대한 실험적 연구
양동학,왕쩐후안,권영철 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.4
The cooling operating characteristics of the 3 room air conditioner are experimentally investigated for the number of the indoor units (A, B, C) and the operating conditions (standard, overload) under the cooling operation. The cooling capacity and COP were calculated using a multi-type calorimeter. Also, EEV opening, compressor frequency, and superheat degree were obtained when the compressor started. From the experimental results, we can see that the performance and operation characteristics of the air conditioner depend on the indoor unit operation method. In case of simultaneous and single operation, the cooling overload performance was measured lower than the standard condition. Also, in the overload operation, the power consumption of the compressor was greatly increased and the COP was also decreased.
박용정,박병덕 한국수소및신에너지학회 2014 한국수소 및 신에너지학회논문집 Vol.25 No.3
The purpose of this study is to evaluate the experimental performance characteristics of a water-to-watergeothermal heat pump featuring a vapor refrigerant injection for the production of hot water. The performanceof geothermal heat pump with a vapor injection was evaluated by comparing with that of a conventional geothermalheat pump without a vapor injection. For heating operation, the geothermal heat pump with a vapor injection issuperior in COP and heating capacity. The vapor injection was more effective for supplying hot water whileoverloading. The vapor injection was effective for the improvement of the cooling capacity. However, the vaporinjection was not effective for the increasing of COP according to the increased input of a compressor. Theadvantage of vapor injection in water-to-water geothermal heat pump become disappeared while cooling operationwith lower part loading.
박용정,박병덕 한국수소및신에너지학회 2019 한국수소 및 신에너지학회논문집 Vol.30 No.4
Air conditioners adopting high energy efficiency and low global warming potential (GWP) refrigerant are being developed globally. In case of commercial air conditioner, R32 with lower GWP than R410A is attracting industrial attentions. In this study, the performance of water-to-water geothermal heat pump adopting R32 is compared with that of the heat pump using R410A. By using R32 instead of R410A, heating capacity and COP in heating standard condition can be increased by 8.8% and 6.3% respectively. Also, cooling capacity and COP in cooling standard condition can be increased by 5.3% and 3.1% respectively by using R32. But in case of using R32, systemic improvements are required to decrease discharge temperature of compressor since discharge temperature rises abnormally in heating operations.
냉매충전량과 배관길이가 모세관 팽창장치를 갖춘 냉동기의 성능에 미치는 영향
최은수,박승배 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
The effects of the pipe-connection length on the performance of refrigeration systems with capillary-tube-expansion devices were studied. Cooling capacity, coefficient of performance, refrigerant pressure, electric power consumption, temperatures of evaporator and condenser were monitored. As the pipe-connection length increased, the cooling capacity decreased, and the proper mass of the refrigerant increased. Around an optimal point, where the cooling capacity is highest, stable thermal ocillation were observed. The cooling capacity were ocillating between a high value and a low value, which were disappeared by adding a more refrigerant.
운전조건 변화가 CO₂ 자동차 에어컨 시스템의 냉방성능에 미치는 영향에 대한 실험적 연구
이준경(Jun Kyoung Lee),이동혁(Dong Hyuk Lee),이헌균(Heon Kyun Lee),원종필(Jong Phil Won),최규정(Kyu Jung Choi),주필호(Phil Ho Ju),이원석(Won Suk Lee),최동기(Dong Ki Choi) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with the research for the effects of the operating parameters that could be used for a transcritical CO₂ mobile air-conditioning system on the cooling performance. It presents experimental results for the performance characteristics of a CO₂ mobile air conditioning system with various operating conditions such as different gas cooler inlet pressures and frontal air velocities/temperatures passing through the evaporator and the gas cooler. Experimental results show that the cooling capacity was more than 5㎾ and coefficient of performance (COP) was more than 2.1, also. Therefore, we checked that the mobile air-conditioning system using CO₂ has good cooling performance compared to that using HFC-134a.