单/双级跨临界二氧化碳地源热泵性能分析  

Study on the Performance Comparison between Single-stage and Double-stage Transcritical CO2 Ground Source Heat Pump Systems

作　　者：王彦杰 刘雄[1] 欧竞赛 WANG Yan-jie;LIU Xiong;OU Jing-sai(School of Building Services Science and Engineering,Xi'an University of Architecture and Technology,Xi'an,China,710055)

机构地区：[1]西安建筑科技大学建筑设备科学与工程学院,陕西西安710055

出　　处：《热能动力工程》2020年第3期187-192,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：针对运行能耗较高的恒温恒湿空气处理机组,提出了用于驱动其运行的二氧化碳单/双级地源热泵两种系统,通过建立热力学计算模型,对两种系统在冬季运行时的稳态工况进行了理论计算,研究了室外新风温度、新风比、地埋管进口水温等因素对系统性能的影响。结果表明:单/双级系统的性能系数均随新风温度的升高而下降;而双级系统相对单级系统的性能提升率在新风需要预热的情况下近似保持不变,在新风不需要预热时,随新风温度的升高呈近似直线下降趋势;此外,性能提升率随新风比的增加呈近似直线上升趋势,却随地埋管进口水温的增加呈近似直线下降趋势;三个因素中,地埋管进口水温对两个系统的性能差距影响最大、新风比次之、新风温度最小。Two new types of single-stage and double-stage transcriticial carbon dioxide ground source heat pump systems driven by constant temperature and humidity air handling units with high energy consumption were proposed.Then,by establishing thermodynamic calculation models,the COP of the steady-state operating conditions of the two systems in winter were calculated theoretically.And the influences of the factors such as the temperature of outdoor fresh air,fresh air ratio,and water temperature at the entrance of buried pipes on the performance of the two systems were studied.The results show that the COP of both single and double stage system decrease with the increase of fresh air temperature.While the performance improvement rate of double-stage over single-stage system remains almost unchanged when the fresh air needs to be preheated,but it decreases approximately linearly when the fresh air does not need to be preheated.In addition,it increases approximately linearly with the increase of fresh air ratio,but decreases approximately linearly with the increase of water temperature at the entrance of buried pipe.Among the three conditions,the water temperature at the entrance of buried pipes has the greatest impact on the performance difference between the two systems,followed by the fresh air ratio,and then the fresh air temperature having the least impact.

关 键 词：地源热泵 恒温恒湿 性能系数 跨临界 二氧化碳 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]