OPERATION EFFICIENCY PERFORMANCE OF MULTI-MODE REGENERATION HEATING TOWER HEAT PUMP SYSTEM

Zhao Shanguo; Zhang Xiaosong; Liang Caihua; Huang Shifang

doi:10.19912/j.0254-0096.tynxb.2022-0324

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 107-115. DOI: 10.19912/j.0254-0096.tynxb.2022-0324

OPERATION EFFICIENCY PERFORMANCE OF MULTI-MODE REGENERATION HEATING TOWER HEAT PUMP SYSTEM

Zhao Shanguo^1,2, Zhang Xiaosong¹, Liang Caihua¹, Huang Shifang¹

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Abstract

To address the inadequacies of traditional building air conditioning systems’cooling and heating sources, this study employs a multi-mode regeneration heating tower heat pump system and discusses its operating principle and mode in detail. The novel system is used in an actual energy-saving transformation project, and the control strategy and calculation techniques for assessment are provided. The results of field tests conducted under normal operating circumstances of refrigeration in the summer and heating in the winter reveal that in summer, the average comprehensive cooling efficiency is 4.34 with an average air temperature of 28.6 ℃ and an average relative humidity of 84.5%. At an average ambient temperature of 7.68 ℃ and an average relative humidity of 81.2%, the average comprehensive heating efficiency is 3.46. The moisture absorption of the solution during system operation is related to the ambient temperature and relative humidity. The moisture absorption keeps a smaller amount at a higher ambient temperature and lower relative humidity. The heat absorption of heating tower is composed of sensible heat and latent heat. The proportion of latent heat is affected by the moisture absorption during operation and strongly related to the relative humidity of the air. The lower the relative humidity, the smaller the differential pressure of water vapor on the air-water contact surface, and the more difficult it is for water to migrate from the air to the solution. Under the test conditions of 81.2% relative humidity during the test time, the latent heat caused by moisture absorption accounts for approximately 11.5 percent. With changes in the external environment and working conditions, the regeneration efficiency of the regeneration unit remains relatively stable, with an average value of 4.45 kg/kWh within 5 days.

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heat pump systems / operation efficient / cooling / heating / heating tower / regeneration

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Zhao Shanguo, Zhang Xiaosong, Liang Caihua, Huang Shifang. OPERATION EFFICIENCY PERFORMANCE OF MULTI-MODE REGENERATION HEATING TOWER HEAT PUMP SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 107-115 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0324

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