地源热泵系统土壤直接供冷模式运行性能预测  

Performance prediction of ground source heat pump system under direct soil cooling-supply mode

作　　者：李凤勇 王恩宇[1,2,3] 左春帅 LI Fengyong;WANG Enyu;ZUO Chunshuai(School of Energy and Environment Engineering,Hebei University of Technology,Tianjin 300401,China;Hebei Key Laboratory of Thermal Science and Energy Clean Utilization,Tianjin 300401,China;Tianjin Key Laboratory of Clean Energy and Pollution Control,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]河北省热科学与能源清洁利用技术重点实验室,天津300401 [3]天津市清洁能源利用与污染物控制重点实验室,天津300401

出　　处：《河北工业大学学报》2022年第6期64-72,共9页Journal of Hebei University of Technology

基　　金：国家重点研发计划(2016YFC0700707);天津市重点研发计划(17YFCZZC00560,18YFCZZC00080)。

摘　　要：对天津地区办公建筑地源热泵空调系统进行供冷前期运行模拟,分析在不开启地源热泵机组,将室外地能换热系统与室内末端系统直接连接为建筑物提供冷量的运行方式(土壤直接供冷模式)下空调系统运行效果。结果表明:1)土壤直接供冷模式下水泵流量为30.00 m^(3)/h时(额定流量的34.00%)系统运行效果最好,管道内流体流动状态处于湍流流动区间时,流量越小系统运行能效比越高;2)供冷前期的空调供冷负荷为建筑设计负荷的1/6时,可采用土壤直接供冷模式为建筑供冷,供冷14 d土壤直接供冷比地源热泵机组供冷节约电量1100.73 kW∙h;3)初始土壤温度如果从13.00℃增大到22.00℃,空调系统平均COP_(a)会从30.19降至13.38,但远大于供冷期开启地源热泵系统时的系统平均COP(a)值(平均为4.25);4)初始土壤温度比水泵流量对空调系统供冷量影响更大。This paper simulates the air-conditioning system of ground source heat pump during early cooling-supply period in office buildings in Tianjin,and analyzes the operation effect of air-conditioning system under the operation mode when the ground source heat pump unit is not turned on and the outdoor ground energy heat exchange system is directly connected to the indoor terminal system(direct soil cooling-supply)to provide cooling for the building.The results shows:1)When the water pump flow rate is 30.00 m^(3)/h(34.00%of the rated flow rate),the system operates best in the direct soil cooling mode.When the fluid flow in the pipeline is in the turbulent flow range,the smaller the flow rate is,the higher the system operation efficiency has;2)When the air-conditioning cooling load in the early cooling-supply period is 1/6 of the building designed load,the direct soil cooling-supply mode can be used for building cooling.Comparing with the ground source heat pump cooling mode,the soil direct cooling mode can save 1100.73 kW∙h for 14 days;3)If the initial soil temperature increases from 13.00℃to 22.00℃,the average COP_(a) of the air-conditioning system will decrease from 30.19 to 13.38,but it is much higher than the average COP_(a)(4.25 on average)of the system when the ground source heat pump system is turned on during the cooling-supply period;4)The initial soil temperature’s influence is greater on the cooling capacity of the air-conditioning system than the water pump flow.

关 键 词：地源热泵 土壤直接供冷 供冷前期 土壤温度 TRNSYS 

分 类 号：TU831[建筑科学—供热、供燃气、通风及空调工程]