Development of low-cost evaluation method for coefficient of performance of heat pump for heating greenhouses
Development of low-cost evaluation method for coefficient of performance of heat pump for heating greenhouses
复制标题
温室供暖热泵性能系数低成本评价方法的开发
DOI:
10.1007/s10668-019-00518-x
复制
发表时间:
2020
影响因子:
4.9
通讯作者:
Itaka K.
中科院分区:
文献类型:
--
作者:
Moritani,S.;Sasaki K.;Itaka K.
Heat pumps (HPs) combined with groundwater have been used for heating greenhouses. Visualizing the coefficient of performance (COP) of an HP system through a display panel in the greenhouse or a remote display on a device such as a mobile phone could help farmers avoid wasting power and overpumping groundwater and enable them to use HPs in an energy-efficient manner. Simple COP estimation is important for reducing the number of temperature sensors attached to HPs; doing so could make HPs systems including visualization affordable for farmers. In this study, the COP was measured using an HP converted from an affordable air conditioner into a liquid-to-liquid heat exchanger unit. The COP equation was used with the temperatures of condensers and evaporators, which can be measured easily. The water temperature was simulated to verify this COP equation based on the energy balance equation incorporated with variables such as tank water temperature, water injection rate, and temperature of tank water inflow and outflow. The results obtained using equations with two and three coefficients showed good agreement with the measured values, particularly when the tank water temperature was 5–40 °C.
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DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
10.1016/j.egypro.2016.09.065
发表时间:
2016
期刊:
Energy Procedia
影响因子:
--
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H. Kawashima
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
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