气-气换热器对太阳能再生装置性能的影响

Effects of gas-gas heat exchanger on improving the performance of solar regenerator

再生装置是太阳能蒸发除湿降温系统的重要组成部分,但普遍存在再生性能较低的问题。为了提高再生性能,将气-气换热器加装于再生装置中用于回收部分空气余热。讨论了两种再生装置的特点,测试了加装前后再生装置的性能。试验结果表明:再生装置的除湿增量、再生效率都随着太阳能热水温度的升高而提高;气-气换热器的加装能有效提高再生装置的再生性能,除湿量可以达到40～55g/kg,较未加装时提高了35～45g/kg;再生效率在热水温度90℃时可以达到60%,同等温度下高出未加装换热器50%。因此,余热的回收利用对于再生装置性能的提高至关重要。

The low energy efficiency of solar regenerator has been a common concern in the solar evaporation-dehumidification cooling system.In order to enhance the energy utilization efficiency,a gas-gas heat exchanger was used as an additional heat-recycle unit to capture residual heat from hot air.Two types of regenerators with（GGHEW） and without（GGHEN）gas-gas heat exchanger were studied and their performances were compared.The results showed that both dehumidification capability and efficiency of regenerator were enhanced with the increase of the temperature of water heated by solar energy.The basic performance of regenerator was significantly improved by adding gas-gas heat exchanger.Dehumidification capability of GGHEW was in a range from 40 to 55 g/kg,which was 35-45 g/kg more than that of GGHEN.The regeneration efficiency of GGHEW could reach up to 60% at 90℃ of hot water,which was 30%-50% higher than that of GGHEN.It was concluded that installation of gas-gas heat exchanger on the solar regenerator can improve the solar energy utilization efficiency and the regeneration efficiency,which indicates that heat recycle is necessary for solar regenerator.