太阳能驱动闭式转轮除湿空调系统性能研究

Performance Investigation of a Solar-driven Closed-wheel DesiccantAir-conditioning System

为解决传统开式转轮除湿空调系统再生排风能量浪费的问题,本文提出了可高效回收再生排风空气显热和潜热的太阳能驱动闭式转轮除湿空调系统,利用TRNSYS软件对系统进行建模,模拟研究了冷水流量比和新风比对系统性能的影响和系统动态性能,并对模拟的准确性进行实验验证。结果表明:模拟结果与实验结果的相对误差最大为±9.8%。太阳能驱动闭式转轮除湿空调系统的最优冷水流量比为1∶5∶4。系统在广州地区整个制冷季(6月1日—9月30日)平均电力COP_(e)为2.4,平均热力COP_(th)为2.1,累计取水量为25.66 t,热回收量为9.70 MW。相比于太阳能驱动开式转轮除湿空调系统,太阳能驱动闭式转轮除湿空调系统平均COP_(e)和COP_(th)分别提高42.1%和69.2%,CO_(2)排放量减少29.3%。

A solar-driven closed-wheel desiccant air-conditioning system is proposed to efficiently recycle the sensible heat and latent heat of regenerative exhaust air to solve the problem of exhaust air energy waste in traditional open-wheel desiccant air-conditioning systems.The system was modeled using TRNSYS software.Simulations were conducted to assess the influence of the cold-water flow rate ratio and fresh-air ratio on system performance and dynamic behavior.Additionally,an experimental device was built to verify the accuracy of the simulation model.The maximum relative error between the simulation results and the experimental results was±9.8%.The optimal coldwater flow rate ratio of the system was determined to be 1∶5∶4.During the entire refrigeration season(1st June to 30th September)in Guangzhou,the average power COP_(e)was 2.4,the average thermal COP_(th)was 2.1,the harvesting water capacity was 25.66 t,and the heat recovery capacity was 9.70 MW.Compared with the solar-driven open-wheel desiccant air-conditioning system,the average COP_(e)and COP_(th)of the solar-driven closed-wheel desiccant system increased by 42.1%and 69.2%,respectively,and the CO_(2)emission was reduced by 29.3%.