Active Air-Source Heat Storage and Release System for Solar Greenhouses: Design and Performance

Yingfeng Xiang, Mingwen Shi, Chuanzhen Li, Chao Zhu, Yifan Cao, Yangda Chen, Weijun Wu, Yapeng Li, Xuxin Guo and Xianpeng Sun ()
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Yingfeng Xiang: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Mingwen Shi: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Chuanzhen Li: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Chao Zhu: State Grid Shaanxi Electric Power Research Institute, Xi’an 710199, China
Yifan Cao: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Yangda Chen: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Weijun Wu: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Yapeng Li: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Xuxin Guo: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China
Xianpeng Sun: College of Horticulture, North West Agriculture and Forestry University, Xianyang 712100, China

Energies, 2022, vol. 16, issue 1, 1-13

Abstract: The temperature difference between day and night in a solar greenhouse is large. Heat in a greenhouse is typically in excess during the day while the temperature is low and the humidity is high at night. This study designs and tests an active heat storage and release air-source heat-pump system with a thermally insulated water tank as the energy storage body. By comparing air temperature and humidity in a test greenhouse with a control greenhouse in typical weather conditions, the power consumption and performance of the system are evaluated. The results show that compared with the control greenhouse, the average daytime temperature of the test greenhouse is lowered by about 3 °C during the operation of the system in typical weather conditions. At night, the average temperature is increased by about 4 °C, and the relative humidity is decreased by about 20%. When optimized, the maximum coefficient of performance (COP) of the system can reach 4.32 in heat storage mode. The nighttime heat release from the energy storage tank accounts for 26.9% to 51.2% of the nighttime energy consumption, and the energy utilization efficiency is 59.6% to 497.0%. This study provides a new way to control environmental parameters in solar greenhouses.

Keywords: solar greenhouse; active heat storage and release; heat pump system; performance test; energy storage optimization; greenhouse agriculture (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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