低位热驱动的工业建筑除湿降温空调系统应用研究

Application of Industrial Building Dehumidification and Cooling Air-conditioning System Driven by Low-grade Heat

工业建筑低品位余热资源丰富,但较难利用,尤其是80℃以下的余热,高效回收利用该温度以下的余热,对于节能环保意义重大。本文提出一种低位热驱动的工业建筑除湿降温空调系统,采用串联方式使热水先后驱动冷水机组和溶液除湿新风机组,从而实现低品位热的梯级深度利用。系统应用热湿解耦处理技术,使溶液除湿新风机组处理空气潜热负荷,冷水机组处理空气显热负荷。工程应用结果表明:在热源温度呈周期波动且均值为77.2℃的条件下,冷水机组的平均COP为0.69,冷水机组可提供15.1~16.3℃的高温冷冻水,实现对工业建筑热环境的有效调控。溶液除湿新风机组可将新风含湿量从19.4 g/(kg干空气)处理至11.9 g/(kg干空气),机组的平均除湿效率为61.2%。

The low-grade waste heat resources of industrial buildings are abundant but difficult to utilize,especially when the waste heat is below 80℃.The effective recovery and utilization of such waste heat are of great importance for energy conservation and environmental protection.In this study,a low-grade heat-driven dehumidification and cooling air-conditioning system for industrial buildings is proposed.The hot water drives the chiller first and then drives the liquid desiccant dehumidification unit for fresh air,which realizes the cascade utilization of low-grade heat.The system features separate sensible and latent cooling technology,which is manifested by using the liquid desiccant dehumidification fresh air unit for the latent load and the chiller for the sensible load.The results of this application show that when operating at an average temperature of 77.2℃under a periodically fluctuating heat source temperature,the average coefficient of performance of the chiller is 0.69,which can provide high-temperature chilled water at 15.1-16.3℃and effectively control the thermal environment of the building.The liquid desiccant dehumidification fresh air unit can reduce the humidity ratio of the fresh air from 19.4 g/(kg dry air)to 11.9 g/(kg dry air)at an average dehumidification efficiency of 61.2%.