Performances of an air thermal energy utilization system developed with fan-coil units in large-scale plastic tunnels covered with external blanket

作     者：Chengji Zong Zibin Xiao Weitang Song Pingzhi Wang Guifang Zhang Ming Li 

作者机构：College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Yinchuan Xingqing District Agricultural Technology Extension CenterYinchuan750001China Key Laboratory of Agricultural Engineering in Structure and EnvironmentMinistry of Agriculture and Rural AffairsBeijing 10008 

出 版 物：《International Journal of Agricultural and Biological Engineering》 (国际农业与生物工程学报（英文）)

年 卷 期：2022年第15卷第5期

页      面：56-62页

核心收录：

学科分类：0401[教育学-教育学] 04[教育学] 0828[工学-农业工程] 

基　　金：financially supported by China Agriculture Research System of MOF and MARA(Grant No.CARS-23-D02) the Key Research and Development Plan,Science Technology Department of Zhejiang Province(Grant No.2019C02009) 

主　　题：large scale plastic tunnel air thermal energy utilization system energy conservation COP 

摘      要：To improve the problem of low temperature at night in winter due to the lack of thermal storage in large-span plastic tunnels,an air thermal energy utilization system(ATEUS)was developed with fan-coil units to heat a large-scale plastic tunnel covered with an external blanket(LPTEB)on winter *** ATEUS was composed of nine fan-coil units mounted on top of the LPTEB,a water reservoir,pipes,and a water circulation *** the heat exchange between the air and the water flowing through the coils,the thermal energy from the air can be collected in the daytime,or the thermal energy in the water can be released into the LPTEB at *** sunny days,the collected thermal energy from the air in the daytime(E_(c))and released thermal energy at night(E_(r))were 0.25-0.44 MJ/m^(2) and 0.24-0.38 MJ/m^(2),*** ATEUS as a heating system,its coefficient of performance(COP),which is the ratio of the heat consumption of LPTEB to the power consumption of ATEUS,ranged from 1.6-2.1.A dynamic model was also developed to simulate the water temperature(T_(w)).Based on the simulation,E_(c) and E_(r) on sunny days can be increased by 60%-73%and 38%-62%,respectively,by diminishing the heat loss of the water reservoir and increasing the indoor air temperature in the period of collecting thermal ***,the COP can reach 2.6-3.8,and the developed ATEUS can be applied to heating the LPTEB in a way that conserves energy.