土壤-空气耦合源热泵系统能效与碳排放分析

Energy Efficiency and Carbon Emission Analysis of Soil-Air Coupled Source Heat Pump System

为了缓解日益增长的建筑能耗问题,充分利用浅层地热资源,提出了一种基于地下建筑空间空气换热的空气源热泵系统,并对其性能系数进行计算分析;通过苏州某尚未启用的地库进行实际测试,验证了数值计算数据的可靠性;利用实际测出的冬、夏季典型空调日空气温度,分别经过连续30个该气象条件下的间歇通风运行模拟,用以充分验证该系统的可持续性。结果表明:地下建筑土壤-空气换热系统具备持续的换热能力;整个实验阶段空调工况下该换热系统的夏季温升率约为5.9%,冬季温降率约为7.5%;该热泵机组冬、夏季空调工况下的性能系数分别达到了3.86和4.87,能效贡献率分别为6.9%和9.7%;每1 MJ冷、热量可分别减少二氧化碳排放量4.7 g和4.2 g。

In order to alleviate the problem of increasing building energy consumption and make full use of shallow geothermal resources,an air source heat pump system based on underground building space air heat transfer is proposed,and its performance coefficient is calculated and analyzed.The reliability of the numerical calculation data is verified by the actual test of a basement in Suzhou which has not been used yet.The typical daily temperature in winter and summer is used as the boundary temperature of intermittent ventilation operation simulation(operation at this temperature for 30 days)to fully verify the sustainability of the system.The results indicate that the soil-air heat exchange system of underground buildings has continuous heat transfer capability.The temperature rise rate of the heat exchange system is about 5.9%in summer and 7.5%in winter under the condition of air-conditioning during the whole experimental stage.Performance coefficients of the unit under winter and summer air-conditioning conditions are 3.86 and 4.87 respectively,and the energy efficiency contribution rates are 6.9%and 9.7%respectively.Each one MJ cooling and heat can reduce the CO2emission by 4.7 g and 4.2 g respectively.