太阳能驱动的膜式加热加湿系统性能实验研究

中空纤维膜加湿系统能从根本上解决空气加湿过程中气液夹带的问题。通过搭建太阳能驱动的中空纤维膜加热加湿系统试验台并在冬季进行实验测试,分析出太阳能辐射量、空气体积流量和热水体积流量对系统加热加湿性能的影响。研究发现提高太阳能辐射量和空气体积流量对系统的加湿能力和热性能系数均有积极影响,而前者的影响更为显著。为了获得最好的系统性能,选择40℃(对应太阳能辐射量为329 W/m²)和100 L/h作为最佳热水条件,空气体积流量为100 m³/h。在此条件下,出口空气的含湿量为22.4 g/kg,约为环境空气的4倍。空气温度为30.5℃,热性能系数COP可达2.40,太阳能利用率为45%。由于膜加湿器的热质交换能力有限,过度提高热水温度反而降低太阳能利用率。为了在含湿量低的环境空气下提供较好的性能,采用低的空气体积流量,有助于提高出风的含湿量和空气温度。

EXPERIMENTAL STUDY ON PERFORMANCE OF SOLAR-POWERED MEMBRANE HEATING AND HUMIDIFICATION SYSTEM

The hollow fiber membrane humidification system solves the problem of air-liquid entrainment in the humidification process.The effects of solar radiation,air volume flow and hot water volume flow on the heating and humidification performance of the system were analyzed by building a solar-powered hollow fiber membrane heating and humidification system test bench and conducting experimental tests in winter.Increased solar radiation and air volume flow were found to have a positive effect on both the humidification capacity and thermal performance coefficient of the system,with the former having a more significant effect.To obtain the best system performance,40℃(corresponding to solar radiation of 329 W/m²)and 100 L/h were chosen as the optimal hot water conditions with an air volume flow rate of 100 m³/h.Under these conditions,the moisture content of the outlet air is 22.4 g/kg,which is about 4 times the ambient air.The air temperature is 30.5℃,the thermal performance coefficient(COP)is 2.40 and the solar energy utilization rate is45%.Because membrane humidifiers have limited thermal mass exchange capacity,raising hot water temperatures excessively reduces solar energy utilization.In order to provide better performance in ambient air with low moisture content,the use of low air volume flow helps to increase the moisture content and air temperature of the outlet air.