• 제목/요약/키워드: Air-to-air heat pump

검색결과 670건 처리시간 0.027초

축열수조를 이용하는 열펌프식 난방의 특성에 관한 연구 (A Study on The Characteristics of Heat Pump Heating System Utilizing Heat Storage Tank)

  • 김효경;이기영;박문수;황인수
    • 대한설비공학회지:설비저널
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    • 제16권4호
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    • pp.392-405
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    • 1987
  • A study of appling solar assisted heat pump heating system to Korean climatic charac-teritics has been undertaken through computer simulation using TRNSYS (A Transient System Simulation Program). It is insufficient for heating system composed of each of solar and heat pump system to supply heat met with heating load. So SAHP (Solar Assisted Heat Pump) heating systems which combined solar system with heat pump system are analized using the standard weather data of Korea. And SAHP heating systems are categorized into the series system in which the solar storage is used as the source for the heat pump, the parallel system in which ambient air is used as the source for the heat pump, and the dual source system in which the storage or ambient is used as the source depending on which source yields the lowest work input. These combined system are better than each of solar and heat pump heating system in view of thermal performance, and parallel system is most effective among these combined systems.

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심야전기보일러 대체용 공기열 히트펌프 성능평가 (A Study of Air-source Heat Pump Performance Analysis for Replacing Night Time Electric Heating Boiler)

  • 조종영;정훈;이철희
    • 한국기계기술학회지
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    • 제13권3호
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    • pp.81-85
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    • 2011
  • The night time electric cost is cheaper due to electric supply and demand policy in Korea from 1985. Currently about 900,000 customers are using night time electric heating boilers and this causes shift of peak demand time to night in winter and increase of deficit spending. To solve this problem, replacing night time electric heating boiler by air-source heat pump using night time electricity has been proposed. An air-source heat pump can provide efficient heating equipment especially in a warm climate. For estimating the night time electric heat pump COP(Coefficient of Performance), Korean Standard KS C 9306:2010 and European Standard EN-14511:2004 is available. SCOP(Seasonal COP) using European weather bin data is also calculated. SCOP is not available yet but European Committee for Standardization will establish a standard in the near future. The evaluation result show that the replacing night time electric heating boiler by heat pump can be possible.

착상을 수반한 멀티 가변속 열펌프의 동특성 (A Dynamic Characteristic of the Multi-Inverter Heat Pump with Frosting)

  • 박병덕;이주동;;황일남;장세동;황정하
    • 설비공학논문집
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    • 제15권5호
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    • pp.337-345
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    • 2003
  • In the case of heat exchangers operating under frosting condition, the growth of frost layer causes the heat exchanger to increase the thermal resistance and pressure loss of the air flow. In this paper, a transient characteristic prediction model of the heat transfer for multi inverter heat pump with frosting on its surface was presented taking into account the change of the fin efficiency due to the growth of the frost layer. In this dynamic simulation program, which was peformed for a basic air conditioning system model, such as evaporator, condenser, compressor, linear electronic expansion valve (LEV) and bypass circuit. The theoretical model was driven from the obtained heat transfer coefficient and mass transfer coefficient, independently. And we consider heat transfer performance was only affected by a decrease of the wind flow area. The calculated results were compared with some cases of experiments for frosting conditions.

동특성을 고려한 열펌프의 엑서지 해석 (Exergy analysis of heat pump in consideration of its dynamic response)

  • 장기태;남관우;정상권
    • 설비공학논문집
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    • 제10권2호
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    • pp.155-164
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    • 1998
  • A multi-type heat pump controls the mass flow rate of the working fluid to cope with variable heat loads when it is under dynamic load condition. This paper describes the exergy analysis associated with the dynamic response of heat pump. First, a basic heat pump cycle is examined at steady state to show the general trends of exergy changes in each process of the cycle. Entropy generation issue in the exchangers is discussed to optimize the heat pump cycle. Second, the performance of the inverter-driven heat pump is compared to that of the conventional one when the heat load is variable. Third, the exergy destruction rate associated with the ON/OFF operations of the heat pump is calculated by simulating the thermodynamic states of the condenser and the evaporator. The inefficiency of the ON/OFF operation during the transient period is quantitatively revealed by the exergy analysis.

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공조시스템용 지열히트펌프의 실증평가에 관한 연구 (In-situ Performance Evaluation of a Ground Source Heat Pump for an Air Conditioning System)

  • 박윤철;박성구
    • Journal of Advanced Marine Engineering and Technology
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    • 제32권1호
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    • pp.66-72
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    • 2008
  • In this study, the ground source heat pump was installed at a research center in Jeju Island to verify the performance of the system and to give an information for a economic feasibility. The performance test was conducted until the heat storage tank temperature reached at $5^{\circ}C$ from $50^{\circ}C$ in the cooling operation, and until the storage temperature goes up to $50^{\circ}C$ from $10^{\circ}C$ in the heating mode. As results, the system performance shows that $2.2{\sim}3.5$ for the cooling operation and $2.5{\sim}3.5$ for heating operation. It is found that the underground is good heat source for the heat pump with $3{\sim}10^{\circ}C$ variation range. The ground source heat pump could be connected one of air conditioning system without any problem in system performance. Based on the economic analysis, the initial cost for the ground source heat pump will be compensated after 4 years operation. If the system runs 20 years, approximately 300 million Won will be saved when the air conditioning system adapt the ground source heat pump based on Life Cycle Cost analysis.

열펌프 건조 해석 모델을 이용한 측정 결과의 분석 (Investigation of Experimental Results Using the Drying Model for a Heat Pump Dryer)

  • 이공훈;김욱중;김종률;이상열
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.2268-2273
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    • 2008
  • The drying model has been used to obtain the fundamental information required to design the heat pump dryer with the simple thermodynamic model. In the model, the input conditions are crucial to obtain the acceptable results. The model includes one-stage heat pump cycle, simple drying process using the drying efficiency. The drying efficiency is defined with the conditions of inlet and outlet in the dryer. The experiment has been carried out in the pilot dryer with one-stage heat pump cycle. Refrigerant 134a is used in the heat pump cycle. In the dryer, some of drying air flows through the heat pump system and the rest of air bypasses the heat pump system and circulates through the drying chamber. Some operating conditions from the pilot dryer are used as input conditions of the model and the results are compared with experimental results for the validation.

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$CO_2$ 히트펌프 열교환기의 성능 해석 모델 개발 (Development of Performance Analysis Model of $CO_2$ Heat Pump Heat Exchanger)

  • 김민석;장영수
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2006년도 하계학술발표대회 논문집
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    • pp.651-656
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    • 2006
  • A performance analysis model has been developed for fin-tube type heat exchanger for $CO_2$ heat pump. The model uses the tube-by-tube method Because air-side thermal resistance has a great portion among total thermal resistances, it is important to understand air-side heat transfer characteristics. The air-side heat transfer correlation has been proposed from experiments using water. The developed model was confirmed by experimental results and can be used for the performance analysis of heat exchanger.

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멀티형 히트펌프 시스템 컴퓨터 시뮬레이션과 실험적 검증 (Multi type heat pump system computer simulation and experimental verification)

  • 한도영;정민영
    • 설비공학논문집
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    • 제12권1호
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    • pp.12-19
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    • 2000
  • The multi type heat pump system may provide more energy savings and better environmental conditions than the single type heat pump system may do. In order to design a multi type heat pump system, it may be recommended to develop the system simulation program, which can predict the characteristics of the system such as unit capacities, power consumptions, and system COP's. In this study, the steady state simulation program of the multi type heat pump system was developed. The results from the simulation program were compared with those from the experimental tests which were performed in the environmental chamber, Cooling tests show 3.11% and 0.94% of error in capacity and COP, and heating tests show 3.30% and 1.90% of error in capacity and COP, respectively. Therefore, the steady state simulation program developed for this study can effectively be used for the design and the performance prediction of the multi type heat pump system.

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2-사이클 열펌프 건조기에서 건조과정에 대한 실험적 연구 (Experimental Study on the Drying Process in the Two-Cycle Heat Pump Dryer)

  • 이공훈;김욱중;김종률;이상열
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2008년도 동계학술발표대회 논문집
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    • pp.636-641
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    • 2008
  • Heat pump drying has a great potential for energy saving due to its high energy efficiency in comparison to conventional air drying. The heat pump dryer is usually operated at the temperature less than $50^{\circ}C$ and the drying temperature is limited to the operating temperature of the heat pump system. In order to increase the drying temperature, the special box-type heat pump dryer has been developed. The dryer uses the two-cycle heat pump system which has the two heat pump cycles for high and low temperature heating. The high temperature cycle uses the refrigerant 124 to get the temperature greater than $80^{\circ}C$ and the low temperature cycle uses the refrigerant 134a. The drying experiment has been carried out to figure out the performance of the dryer with the selected drying material.

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주파수변조장치를 이용한 열펌프식 공기조화기의 냉방-난방에 관한 실험적 연구 (An Experimental Study on the Performance of Heat Pump Air Conditioner according to Frequency Modulator for Cooling and Heating)

  • 이대우;조진호
    • 설비공학논문집
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    • 제1권3호
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    • pp.203-209
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    • 1989
  • This paper is an experimental study on the pleasantly suitable cool/warm air conditioning system in order to minimize the energy consumption by attaching the electronic-controlled device to the heat pump air conditioning system.While the cool/warm air conditioning, the air temperatures in the entrance and exit of the indoor heat exchangers should be checked and when the surface of heat exchanger is reached to the dew point temperature, a speed of the compressor is to be automatically controlled by anti-dewing system in order to minimize the energy consumption.At the result of this study, the energy consuming amount is saved about 5% more than that of the conventional air conditioning system by prevent unnecessary dew forming.

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