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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.
김용기(Yong-Ki Kim),이태원(Tae-Won Lee) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
One of the hybrid(load-sharing) HVAC systems, that attracted attention with its potential for energy savings while providing high thermal comfort, is a radiant cooling system using ceiling panels. The panel system may be combined either with a central forced-air system or with decentralized convective systems, or with in-space fan-coil units. In this study, in order to verify heat transfer characteristics of ceiling panels, numerical and parametric studies were performed for various design and operating variables, such as tube spacing, tube diameter, thermal resistance of fin, inlet water temperature and mass flow rate, etc. As results, in order to improve the cooling capacity in terms of panel design, the ceiling panel must narrow as possible the tube spacing and should be minimized the thermal resistance between the tube and the fin. Also, the temperature and flow rate of cold water supplied to the ceiling panel had a great influence on the cooling capacity of the radiant panel.
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.
에어컨디셔너 냉방능력 및 냉방소비전력 숙련도시험용 표준시료 타당성 검토
박병용(Beungyong Park),정용대(Yongdae Jeong),조진균(Jinkyun Cho),지창민(Changmin Ji) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.11
This study aimed to to develop distributable samples that can be used for proficiency testing to verify the ability of the testing laboratory to standard cooling capacity and power tests. In this study, the test methods used by KS C 9306. We tested the homogeneity and stability 3 air-conditioner sample. Three samples with homogeneity and stability were developed and used for the proficiency testing. It was proved that the proficiency test sample can be use for the proficiency test program. After, We will check a short-term stability and a long-term stability with to change shipping conditions and storagr conditions.
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.
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.
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.
전기 자동차용 이산화탄소 열펌프 시스템의 냉방 능력평가
송준호(Junho Song),최인찬,김영일(Youngil Kim),최종민(Jongmin Choi),이기만(Keeman Lee) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2
Heat pump system using CO2 refrigerant was designed to develop a new air-conditioning system of an electric vehicle. In this paper, the indoor heat exchanger of the heat pump system was analyzed. The cooling capacity has been done with various operating conditions, which are quite matching the actual vehicle"s driving conditions such as different compressor speed, outdoor inlet fontal air velocities, air flow rates and temperatures passing through an indoor heat exchanger using the precision CO2 calorimeter. The experimental results can be used to evaluate the effect of system design changes on system performance as well as the development of a highly efficient heat pump system for cooling.