• Title/Summary/Keyword: Heat Pump

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Heating Performance of Ground source Heat Pump using Effluent Ground Water (유출지하수 열원 지열히트펌프시스템의 난방성능)

  • Park, Geun-Woo;Lee, Eung-Youl
    • New & Renewable Energy
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    • v.3 no.2 s.10
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    • pp.40-46
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    • 2007
  • Effluent ground water overflow in deep and broad ground space building. Temperature of effluent ground water is in $12{\sim}20^{\circ}...$ annually and the quality of that water is as good as well water. Therefore if the flow rate of effluent ground water is sufficient as source of heat pump, that is good heat source and heat sink of heat pump. Effuent ground water contain the thermal energy of surrounding ground. So this is a new application of ground source heat pump. In this study open type and close type heat pump system using effluent ground water was installed and tested for a church building with large and deep ground space. The effluent flow rate of this building is $800{\sim}1000\;ton/day$. The heat pump capacity is 5RT. The heat pump heating COP was $3.85{\sim}4.68$ for the open type and $3.82{\sim}4.69$ for the close type system. The system heating COP including pump power is $3.0{\sim}3.32$ for the open type and $3.32{\sim}3.84$ for close type system. This performance is up to that of BHE type ground source heat pump.

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Performance Analysis of Hybrid Heat Pump System of the Air-to-Air/Air-to-Water with the Ambient Temperature (외기온 변화에 따른 공기-공기/공기-물 형태로 된 복합형 열펌프 시스템의 성능 특성 분석)

  • 송현갑
    • Journal of Biosystems Engineering
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    • v.25 no.4
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    • pp.273-278
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    • 2000
  • The hybrid heat pump system of the air to air and / or air to water was composed and its COP was analyzed with the ambient temperature on the opened and closed loop system respectively. The results be indicated by the equation(7) that the COP(Coefficient of Performance) of air-source(air to air and / or air-water) heat pump is effected with the ambient air temperature and AVACTHE.(Automatic Variable Area Capillary Type Heat Exchanger) 2. The COP of air-to-water heat pump without AVACTHE decreased in accordance with the ambient temperature decrease, however in case of the heat pump with AVACTHE the COP was maintained at 2.8∼3.0 level when the ambient temperature decrease from -$5^{\circ}C$ to $-11^{\circ}C$. 3. The COP of the air-to-water heat pump operated on the open loop was higher 40∼58% than that of the heat pump operated on the close loop. 4. The lower ambient temperature air effect on the COP of the air-to-air heat pump operated on the semi closed loop could be controlled using the AVACTHE, and at the high ambient air temperature the COP increased using the Bypass circuit.

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Effect of the Heat Exchange between Low and High Temperature Refrigerant on the Heat Pump Performance (저온측과 고온측 냉매간 열교환이 열펌프의 성능특성에 미치는 영향)

  • 이건중;송현갑
    • Journal of Biosystems Engineering
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    • v.24 no.4
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    • pp.343-350
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    • 1999
  • The ambient air is commonly used as low-temperature heat source for heat pump operation. However, the coefficient of performance(COP) of the air to water heat pump is decreased with the ambient air temperature drop. In this study to solve this problem, the AVACTHE(Automatic Variable Area Capillary Type Heat Exchanger) with 3 levels of heat exchange area(0, 1,495.4, 1,794.5$\textrm{cm}^2$)was installed in the refrigerant circuit of the heat pump. The AVACTHE effect on the performance of heat pump was tested with the ambient air temperature variation. The COP improvement of the heat pump could be achieved by the AVACTHE installation when below -5$^{\circ}C$ of the ambient air temperature.

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The Study on the Structure and Performance of Heat Pump Calorimeter (열펌프 열량계 구조 및 성능 특성 연구)

  • Park, Seung Byung;Lee, Sang-Hyeok;Choi, Jinnil;Choi, Jong Min
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.11 no.4
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    • pp.7-13
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    • 2015
  • The efficiency, reliability and performance of any heat pump unit can only be ascertained after it has been tested and rated. For this reason, specific facilities, equiped with testing plants are built. Heat pump calorimeter is the facilities used by most of these testing facilities in their rating and certification process. The ultimate function of calorimeters is to, control and maintain the constant standard test conditions (indoor/outdoor entering temperatures and flow rate etc) during testing period. In this study, the test standards of heat pump unit and the structure of the calorimeter are surveyed. In addition, this study analyzes the total energy consumption of a water to water heat pump calorimeter. Heat pump calorimeter consumed much energy to excute the heat pump tests. The energy consumption of the calorimeter was higher than the heat pump unit, and it was increased as the heat pump unit capacity decreased.

Simulation Analysis on Performance Comparison between R744 and R22 Solar Hybrid Heat Pump (R744와 R22를 적용한 태양열 하이브리드 열펌프의 성능 시뮬레이션 비교 분석)

  • Kang, Byun;Cho, Honghyun
    • Journal of the Korean Solar Energy Society
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    • v.33 no.2
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    • pp.1-10
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    • 2013
  • Simulation study of a solar hybrid heat pump using R744 and R22 for residential applications was carried out according to heat pump operating temperature, outdoor temperature and solar radiation. As a result, when the heat pump operating temperature increases from $40^{\circ}C$ to $48^{\circ}C$, the COP of a R744 and R22 heat pump system decrease from 2.15 to 1.7 and from 3.09 to 2.69, respectively. Besides, as the outdoor temperature rises from $3^{\circ}C$ to $11^{\circ}C$, the COP of R744 and R22 heat pump system increase from 1.73 to 2.12 and from 2.73 to 3.02. When the solar radiation increases from 10 to 20 $MJ/m^2$, the collector operating time and collector efficiency of R744 heat pump increase 10.3 times and 50.7%, respectively. The performance of R744 solar hybird heat pump is more sensitive to operation condition compared to that of R22. Besides, the solar heating system is more effective to the R744 heat pump system.

An Analysis of Energy Savings on the Solar-Absorption Heat Pump Systems for the Residential Use with the consideration of Annual Performance (연간 성능을 고려한 가정용 태양열-흡수식 히트펌프의 에너지 절약효과 분석)

  • Lee, J.H.;Lee, K.S.;Won, S.H.;Lee, M.H.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.3 no.4
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    • pp.263-275
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    • 1991
  • Studies on the annual performance of three different type of solar-absorption heat pump system (parallel type, series type, and generator type) are carried out by using the computer simulation. These include the calculation of solar energy from the solar collector, and the revision of computer package, developed by Oak Ridge National Laboratory, to predict the annual performance. Finally using weather data and load conditions, the annual performance are obtained. Results show that the annual operating costs of three solar-absorption heat pump systems are almost same values and 44% lower than that of the pure absorption heat pump system. The total annual input energys of solar-absorption heat pump systems are also about 44% lower than that of the pure absorption heat pump. The nominal size of the solar-absorption heat pump systems can be reduced to a value of 55% that of the pure absorption heat pump that would normally be specified under identical conditions.

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A study on the part-load performance of 2-stage water source heat pump (2단 압축 수열원 열펌프 시스템의 부분부하 운전특성에 관한 연구)

  • Lee, Young-Soo;Baik, Young-Jin
    • Journal of the Korean Society for Geothermal and Hydrothermal Energy
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    • v.5 no.1
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    • pp.13-17
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    • 2009
  • The river water heat source heat pump has the advantage in the performance compared to air source heat pump. In this study, an experimental study on a 2-stage heat pump, which is designed to utilize a river water heat source, were carried out. Generally, a heat pump is designed for maximum capacity rate, but it actually operates at part load condition in most cases. Therefore, an information on the part-load characteristic is very important in view of the system overall performance. In this study, part-load performance tests of a R134a 2-stage compression heat pump were carried out over the river water and supply heating water temperature changes.

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Exergy Analysis of On/Off Controlled Heat Pump

  • Jang, Ki-Tae;Nam, Kwan-Woo;Jeong, Sang-Kwon
    • International Journal of Air-Conditioning and Refrigeration
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    • v.7
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    • pp.22-32
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    • 1999
  • 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 unsteady response of a heat pump. First, a basic heat pump cycle is examined at a steady state to show the general trends of exergy variations in each process of the cycle. Entropy generation issue for the heat exchangers is discussed to optimize the heat pump cycle. Secondly, the performance of the inverter-driven heat pump is compared to that of the conventional one when the heat load is variable. Thirdly, the exergy destruction rate of the heat pump with On/Off operation is calculated by simulating the thermodynamic states of the working fluid in the condenser and the evaporator. The inefficiency of On/Off operation during the transient period is quantitatively described by the exergy analysis.

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

  • Lee, Kong-Hoon;Kim, Ook-Joong;Kim, Jong-Ryul;Lee, Sang-Ryoul
    • Proceedings of the SAREK Conference
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    • 2008.11a
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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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Analysis on Cascade Cycle Heat Pump Application as Night Storage Heater (심야전력을 이용한 Cascade Heat Pump Cycle의 운전결과 분석)

  • JUNG, H.;HWANG, S.W.;LEE, C.H.
    • Journal of the Korean Society of Mechanical Technology
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    • v.13 no.1
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    • pp.113-118
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    • 2011
  • To analyze and verify the effect of replacing thermal storage heater by a cascade cycle heat pump using midnight electricity was installed and tested at a customer's house in Wonju, Korea. The electric night storage heater is consist of 30kW electric heater and 2,700 liters of thermal storage water tank to supply hot water for warming house floor. The power for electric heater was cut off and hot water was only generated by cascade cycle heat pump. Current thermal storage water tank was not eliminated and electric heater wiring was modified. Some operation logic of the heat pump was also modified for proper operation. The required capacity of the heat pump and hot water temperature for given warming condition were estimated. The estimated capacity of heat pump was about 19kW and estimated hot water temperature for proper heating was at least $75^{\circ}C$.