无霜空气源热泵系统除湿与再生工况?分析

为解决传统空气源热泵系统冬季的结霜问题,同时提升夏季机组的性能,本文提出一种"一塔三用"的无霜空气源热泵系统。通过搭建实验台研究了在除湿工况下的空气温度、含湿量、质量流量及溶液温度、质量流量、质量浓度,在再生工况下的溶液质量浓度、温度对溶液塔进出口空气?、除湿?(再生?)、系统输入输出?及?效的影响。结果表明:除湿工况下,除湿?随空气温度、空气质量流量、溶液质量流量的增加以及空气含湿量、溶液温度、溶液质量浓度的减少而增加;系统的?效随空气温度、含湿量、质量流量及溶液质量流量、质量浓度的增加以及溶液温度的减少而增加,其中空气含湿量、溶液质量浓度对?效影响较小,此模式?效最高可达0. 201。再生工况下,再生?随溶液质量浓度、温度的增加而增加;系统?效随溶液质量浓度的增加、溶液温度的减少而增加,其中溶液温度对?效影响较小,此模式?效最高可达0. 108 8。该系统?效率在实验工况下高于常规空气源热泵系统。

Exergy Analysis of Frost-free Air-source Heat Pump System

This study proposes a "one tower with three functions" solution for a dehumidification type frost-free air-source heat pump (ASHP) system, which can not only solve the frost problem of traditional ASHP systems in winter, but also improve the performance of the units in summer. The effects of air temperature, humidity, mass flow rate, solution temperature, and mass concentration were studied under dehumidification conditions. Additionally, solution mass concentration, the effect of solution temperature under regenerative conditions on the air exergy of the inlet and outlet, dehumidification/regenerative exergy, system input, output exergy, and exergy efficiency were studied by constructing the test bench. The results show that under dehumidification, there is an increase in the dehumidification exergy with an increase in the air temperature, air mass flow rate, and solution mass flow rate, and a decrease in the air humidity, solution temperature, and solution mass concentration. Additionally, there is an increase in the system exergy efficiency with an increase in the air temperature, humidity, air mass flow rate, mass flow rate and mass concentration of the solution, and a decrease in the solution temperature, air humidity and mass concentration of the solution. These have an insignificant effect on the exergy efficiency when the efficiency is up to 0.201. Under regenerative conditions, there is an increase in the regeneration exergy with an increase in the solution mass concentration and solution temperature. There is also an increase in the system exergy efficiency with an increase in the solution mass concentration, and a decrease in the solution temperature. The solution temperature has an insignificant effect on the exergy efficiency, when the efficiency is up to 0.1088. The efficiency of this system is higher than that of a conventional ASHP system under experimental conditions.