主动蓄热体内部空气热交换系统的传热性能及参数调控
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摘要
利用日光温室提供主动蓄热体参数研究所需的环境条件,测试了不同风速、空气温度以及空气-土壤温度差对主动蓄热体内空气-土壤热交换系统的管道内部温度、进出口温差以及蓄放热能力的影响规律,以期获得主动蓄热体内部管道通风系统的传热效率及优化调控参数。结果表明:同一风速条件下,进出口温差随室内空气温度增加而增加。放热阶段,当进风口以风速0.5～4.0m·s~(-1)运行时,系统放热量随着风速增加而增加,平均放热流量为9.8～73.9 W;蓄热阶段,当进风口以风速0.5～2.0m·s~(-1)运行时,系统蓄热量随风速增加而增加,平均蓄热流量为21.4～70.2 W,当进风口以风速2.0、4.0m·s~(-1)运行时,平均蓄热流量仅相差2.7 W,性能系数COP相差不大。同一风速条件下,随着室内空气-土壤温度差值不断增大,进出风口温差也不断增加,同时建议白天风机开启蓄热时设定的室内空气温度最少应该比蓄热体内土壤温度高4.5℃。
The solar greenhouse was used to provide the environmental conditions required for the study.The fluences of different wind speeds,air temperatures,and air-soil temperature differences on internal temperature inside the pipeline,inlet and outlet temperature difference and heat storage and release capacity of air-soil heat exchange system(ASHES)in the active heat storage body were tested.In order to get the heat transfer efficiency and optimize the control parameters of the air heat exchange system inside the active heat storage body.The results showed that the inlet and outlet temperature difference increased with the increase of indoor air temperature under the same wind speed conditions.In the heat release stage,when wind speed of air inlet was 0.5-4.0m·s~(-1),the heat release of ASHES increased with the increasing of wind speed,the average heat flow was 9.8-73.9 W.In the heat storage stage,when wind speed of air inlet was 0.5-2.0m·s~(-1),the heat storage of ASHES increased with the increasing of wind speed,the average heat flow was 21.4-70.2 W.When wind speed of air inlet were 2.0m·s~(-1) and 4.0m·s~(-1),respectively,the average difference of heat flow was 2.7 W,and coefficients of performance(COP)of different winds were not much different.At the same wind speed,the inlet and outlet temperature difference was increasing with the increasing of indoor air-soil temperature difference,and it was recommended that the indoor air temperature set when the fan was turned on during the day should be at least 4.5°C higher than the heat storage body soil temperature.
The solar greenhouse was used to provide the environmental conditions required for the study.The fluences of different wind speeds,air temperatures,and air-soil temperature differences on internal temperature inside the pipeline,inlet and outlet temperature difference and heat storage and release capacity of air-soil heat exchange system(ASHES)in the active heat storage body were tested.In order to get the heat transfer efficiency and optimize the control parameters of the air heat exchange system inside the active heat storage body.The results showed that the inlet and outlet temperature difference increased with the increase of indoor air temperature under the same wind speed conditions.In the heat release stage,when wind speed of air inlet was 0.5-4.0m·s~(-1),the heat release of ASHES increased with the increasing of wind speed,the average heat flow was 9.8-73.9 W.In the heat storage stage,when wind speed of air inlet was 0.5-2.0m·s~(-1),the heat storage of ASHES increased with the increasing of wind speed,the average heat flow was 21.4-70.2 W.When wind speed of air inlet were 2.0m·s~(-1) and 4.0m·s~(-1),respectively,the average difference of heat flow was 2.7 W,and coefficients of performance(COP)of different winds were not much different.At the same wind speed,the inlet and outlet temperature difference was increasing with the increasing of indoor air-soil temperature difference,and it was recommended that the indoor air temperature set when the fan was turned on during the day should be at least 4.5°C higher than the heat storage body soil temperature.
引文
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[28]王永维,梁喜凤,王俊,等.温室地下蓄热系统换热管道空气流速对蓄热效果影响[J].农业机械学报,2009,40(5):173-177,202.
[29]周长吉.中国日光温室结构的改良与创新(二):基于主动储放热理论的墙体改良与创新[J].中国蔬菜,2018(3):1-8.
[30]李明,周长吉,丁小明,等.日光温室聚苯乙烯型砖复合墙保温蓄热性能[J].农业工程学报,2016,32(1):200-205.
[2]魏晓明,周长吉,曹楠,等.中国日光温室结构及性能的演变[J].江苏农业学报,2012,28(4):855-860.
[3]李明,周长吉,魏晓明.日光温室墙体蓄热层厚度确定方法[J].农业工程学报,2015,31(2):177-183.
[4]马承伟,卜云龙,籍秀红,等.日光温室墙体夜间放热量计算与保温蓄热性评价方法的研究[J].上海交通大学学报(农业科学版),2008,26(5):411-415.
[5] SETHI V P,SHARMA S K.Survey and evaluation of heating technologies for worldwide agricultural greenhouse applications[J].Solar Energy,2008,82(9):832-859.
[6]李建设,白青,张亚红.日光温室墙体与地面吸放热量测定分析[J].农业工程学报,2010,26(4):231-236.
[7]张锐.日光温室机械化作业严重不足应予重视[J].农机科技推广,2013(9):40.
[8]张永钦,陈希锋.推广大棚蔬菜生产机械化技术的实践与思考[J].现代农机,2015(2):20-22.
[9]陈青云.日光温室的实践与理论[J].上海交通大学学报(农业科学版),2008,26(5):343-350.
[10]史宇亮,王秀峰,魏珉,等.日光温室不同厚度土墙体蓄放热特性比较[J].农业机械学报,2017,48(11):359-367.
[11]曹晏飞.寿光下沉型日光温室性能测试及光环境影响因素分析[D].北京:中国农业大学,2011.
[12]周长吉,刘晨霞.提高日光温室土地利用率的方法评价[J].中国果菜,2009(5):16-20.
[13]邹志荣,鲍恩财,申婷婷,等.模块化组装式日光温室结构设计与实践[J].农业工程技术,2017,37(31):55-60.
[14]郭洪恩,刘波,王晓,等.山东省日光温室现状及发展对策[J].农业科技通讯,2016(10):4-5,8.
[15]周长吉.日光温室墙体“变形记”[N].中国花卉报,2013-02-03(004).
[16]周长吉.周博士考察拾零(六十八)一种以涤棉轻质保温材料为墙体和后屋面的组装式日光温室[J].农业工程技术,2017,37(13):51-54.
[17]周波,张义,方慧,等.装配加温除湿系统的轻简装配式日光温室设计及性能试验[J].农业工程学报,2016,32(11):226-232.
[18]周升,张义,程瑞锋,等.大跨度主动蓄能型温室温湿度环境监测及节能保温性能评价[J].农业工程学报,2016,32(6):218-225.
[19]孙周平,黄文永,李天来,等.彩钢板保温装配式节能日光温室的温光性能[J].农业工程学报,2013,29(19):159-167.
[20]李小芳.日光温室的热环境数学模拟及其结构优化[D].北京:中国农业大学,2005.
[21]鲍恩财,朱超,曹晏飞,等.固化沙蓄热后墙日光温室热工性能试验[J].农业工程学报,2017,33(9):187-194.
[22]张勇,高文波,邹志荣.日光温室主动蓄热后墙传热CFD模拟及性能试验[J].农业工程学报,2015,31(5):203-211.
[23]高文波,张勇,邹志荣,等.主动采光蓄热型日光温室性能初探[J].农机化研究,2015(7):181-186.
[24]王昭,陈振东,邹志荣,等.青海型主动蓄热日光温室应用性能分析[J].中国农业大学学报,2017,22(8):116-123.
[25]鲍恩财,张勇,曹晏飞,等.不同材质传热风道性能及蓄热土壤温度场CFD模拟[J].农业工程学报,2018,34(4):232-238.
[26]范毅,杜震宇,余敏,等.土壤空气换热器换热特性的模拟研究[J].可再生能源,2016,34(10):1517-1524.
[27]王永维,梁喜凤,程绍明,等.空气流速对温室地下蓄热系统加温时热湿传递的影响[J].农业机械学报,2012,43(11):180-185,219.
[28]王永维,梁喜凤,王俊,等.温室地下蓄热系统换热管道空气流速对蓄热效果影响[J].农业机械学报,2009,40(5):173-177,202.
[29]周长吉.中国日光温室结构的改良与创新(二):基于主动储放热理论的墙体改良与创新[J].中国蔬菜,2018(3):1-8.
[30]李明,周长吉,丁小明,等.日光温室聚苯乙烯型砖复合墙保温蓄热性能[J].农业工程学报,2016,32(1):200-205.