Study on Heat Transfer Performance and Parameter Regulation of Internal Air Heat Exchange System in Active Heat Storage Body
《北方园艺》[ISSN:1001-0009/CN:23-1247/S]
- Issue:
- 2019年01
- Page:
- 1-6
- Research Field:
- Publishing date:
Info
- Title:
- Study on Heat Transfer Performance and Parameter Regulation of Internal Air Heat Exchange System in Active Heat Storage Body
- Author(s):
- CAO Yanfei; ZHOU Haiyuan; BAO Encai; JIANG Chengyao; SUN Yachen; ZOU Zhirong
- (College of Horticulture, Northwest A & F University/Key Laboratory of Protected Horticultural Engineering in Northwest, Ministry of Agriculture, Yangling Shannxi 712100)
- Keywords:
- solar greenhouse; active heat storage body; air-soil heat exchange system; wind speed; temperature difference; heat flux
- PACS:
- -
- DOI:
- 10.11937/bfyy.20182035
- Abstract:
- The solar greenhouse was used to provide the environmental conditions required for the study. The in 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—4.0 m·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—2.0 m·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 2.0 m·s-1 and 4.0 m·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.
Last Update: 2018-11-01