装配式柔性墙体日光温室联合储热系统蓄放热特性
S214.3; 增设多蓄热介质联合主动蓄放热系统是解决装配式柔性墙体日光温室"重保温、轻蓄热"问题的有效方法,但当前对于"土壤-空气-水"多介质联合储热系统蓄放热特性和加温效果尚不明确,针对此问题,该研究以配备"空气源地中热交换-水源后墙循环换热"联合储热系统的装配式柔性墙体日光温室为研究对象,采用现场跟踪测试和能量转移测算,对联合储热系统各自和组合的蓄放热特性进行研究.结果表明,配有联合储热系统的装配式柔性墙体日光温室室内夜间最低空气温度维持在10℃以上,室内外最大温差达26.5 ℃.0～50cm的土壤层是该温室主要蓄热介质,晴天土...
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| Published in | 农业工程学报 Vol. 40; no. 15; pp. 183 - 193 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国农业大学水利与土木工程学院,北京 100083%长治学院,长治 046011%北京市农林科学院智能装备技术研究中心,北京 100097
01.08.2024
国家农业智能装备工程技术研究中心,北京 100097 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1002-6819 |
| DOI | 10.11975/j.issn.1002-6819.202404065 |
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| Abstract | S214.3; 增设多蓄热介质联合主动蓄放热系统是解决装配式柔性墙体日光温室"重保温、轻蓄热"问题的有效方法,但当前对于"土壤-空气-水"多介质联合储热系统蓄放热特性和加温效果尚不明确,针对此问题,该研究以配备"空气源地中热交换-水源后墙循环换热"联合储热系统的装配式柔性墙体日光温室为研究对象,采用现场跟踪测试和能量转移测算,对联合储热系统各自和组合的蓄放热特性进行研究.结果表明,配有联合储热系统的装配式柔性墙体日光温室室内夜间最低空气温度维持在10℃以上,室内外最大温差达26.5 ℃.0～50cm的土壤层是该温室主要蓄热介质,晴天土壤层蓄热量最高占总蓄热量的63.5％.地中热交换系统最高占土壤蓄热量的54.4％.水循环系统蓄热量可达424.04 MJ,最高占总蓄热量的45.1％,通过循环蓄热可将储水池内8 m3水的温度提高到35 ℃.连阴天时,通过引入蓄放热比指标,对联合储热系统的运行效果进行定量评价,发现水循环系统具有蓄放热速度快的特点,蓄放热比绝对值最高可达1.62,是当天土壤蓄放热的1.8倍.但从总量上看,土壤仍是连阴天主要放热来源,在北京地区联合蓄放热系统能够维持3个连阴天的热量需求.水循环系统平均性能系数(coefficient of performance,COP)为9.16,地中热交换系统平均COP为6.82,联合蓄放热系统综合COP为8.85,对比热泵,其节能率达60.26％.研究结果为联合储热系统蓄放热机理研究提供了理论依据. |
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| AbstractList | S214.3; 增设多蓄热介质联合主动蓄放热系统是解决装配式柔性墙体日光温室"重保温、轻蓄热"问题的有效方法,但当前对于"土壤-空气-水"多介质联合储热系统蓄放热特性和加温效果尚不明确,针对此问题,该研究以配备"空气源地中热交换-水源后墙循环换热"联合储热系统的装配式柔性墙体日光温室为研究对象,采用现场跟踪测试和能量转移测算,对联合储热系统各自和组合的蓄放热特性进行研究.结果表明,配有联合储热系统的装配式柔性墙体日光温室室内夜间最低空气温度维持在10℃以上,室内外最大温差达26.5 ℃.0～50cm的土壤层是该温室主要蓄热介质,晴天土壤层蓄热量最高占总蓄热量的63.5％.地中热交换系统最高占土壤蓄热量的54.4％.水循环系统蓄热量可达424.04 MJ,最高占总蓄热量的45.1％,通过循环蓄热可将储水池内8 m3水的温度提高到35 ℃.连阴天时,通过引入蓄放热比指标,对联合储热系统的运行效果进行定量评价,发现水循环系统具有蓄放热速度快的特点,蓄放热比绝对值最高可达1.62,是当天土壤蓄放热的1.8倍.但从总量上看,土壤仍是连阴天主要放热来源,在北京地区联合蓄放热系统能够维持3个连阴天的热量需求.水循环系统平均性能系数(coefficient of performance,COP)为9.16,地中热交换系统平均COP为6.82,联合蓄放热系统综合COP为8.85,对比热泵,其节能率达60.26％.研究结果为联合储热系统蓄放热机理研究提供了理论依据. |
| Abstract_FL | The integration of the active heat storage system utilizing multiple heat storage and release media for prefabricated solar greenhouses with flexible material wall(PGFMW)can solve the problem of"good thermal insulation and weak heat storage"in PGFMW.However,it is still unclear on the heat storage and exothermic properties of the multiple media in the combined heat storage system.This study aims to perform on a PGFMW that equipped with a combined"air source ground heat exchange-back wall water circulation(AGHE-WWC)"heat storage system.A systematic investigation was also made on the individual and combined heat storage and release properties.A series of experimental tests were conducted to calculate the energy transfer.The results indicated that the minimum temperature of indoor air at night time was maintained above 10℃,and the maximum difference in temperature between indoors and outdoors was 26.5 ℃ in winter.The primary heat storage medium was identified as the 0-50 cm soil layer of the cultivation area in the PGFMW.Furthermore,the heat storage capacity of the soil layer reached 706.30 MJ on sunny days,accounting for 63.5％of the total heat storage.The difference in temperature between the inlet and outlet of the underground heat exchange was up to 10.8 ℃,which increased by 54.4％in the heat storage capacity of the soil layer.The water circulation was used to store the heat energy of 424.04 MJ on the day,which accounted for up to 45.1％of the total heat storage.Specifically,after cloudy days,the temperature of 8 m3 of water in the storage tank increased from 11 to 35 ℃ by water circulation over two sunny days.In order to evaluate the rate of heat storage and release for the system in combination and individually,an evaluation index called the heat storage and release efficiency ratio(HRE)was inducted to assess system performance.It was found that the maximum absolute value of the HRE for water circulation system was 1.62,which was 1.8 times than the soil HRE on the same day.It proved that the water circulation system releases heat more rapidly compared to the soil on cloudy days.In terms of the total heat,the soil was remained the primary source of indoor heat release on the consecutive cloudy days.In addition,the"AGHE-WWC"heat storage system was realized to fullfill the heat demand for a total of three consecutive cloudy days.Meanwhile,the average heating coefficient of performance(COP)and the uderground heat exchange COP were 9.16 and 6.82,respectively.The combined COP of the"AGHE-WWC"heat storage system was 8.85,while the energy saving rate was as high as 60.26％,compared with the heat pump.The finding can provide a strong reference for heat storage and release in combined heat storage systems. |
| Author | 宋卫堂 马蔷薇 魏晓明 王利春 李明 胡娟秀 |
| AuthorAffiliation | 中国农业大学水利与土木工程学院,北京 100083%长治学院,长治 046011%北京市农林科学院智能装备技术研究中心,北京 100097;国家农业智能装备工程技术研究中心,北京 100097 |
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| Author_FL | WANG Lichun MA Qiangwei LI Ming SONG Weitang WEI Xiaoming HU Juanxiu |
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| DOI | 10.11975/j.issn.1002-6819.202404065 |
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| Keywords | 联合储热 蓄放热特性 传热 solar greenhouses 日光温室 combined heat storage 墙体 heat exchange in the ground 水循环 water circulation 地中换热 wall heat transmission heat storage and release characteristics |
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| Publisher | 中国农业大学水利与土木工程学院,北京 100083%长治学院,长治 046011%北京市农林科学院智能装备技术研究中心,北京 100097 国家农业智能装备工程技术研究中心,北京 100097 |
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| Title | 装配式柔性墙体日光温室联合储热系统蓄放热特性 |
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