Comparative Research On The Performance Of Water Heat Storage And Release System In Chinese Solar Greenhouse

Chinese solar greenhouse is an efficient and energy-saving horticultural facility.Its walls play a very important role in heat preservation and storage and have a direct impact on the greenhouse thermal environment.The wall of the traditional solar greenhouse is mainly brick wall,earth wall,etc.,but its wall structure has limited heat storage capacity and insufficient heat release at night,so it cannot continuously and stably release heat,which will affect the normal growth and development of crops.As a material with large specific heat capacity and easy flow and heat transfer in nature,water is very suitable for heat storage and release.It is of great significance to use water as the heat storage medium of the heat storage system to collect solar energy and improve the temperature or ground temperature at night in the greenhouse.This study by comparing three kinds of heating water thermal storage system?solar panels,water storage and solar water heating system water cycle regenerative heating system,solar water heating system storage?and traditional brick wall heat storage system and the contrast between different heat storage performance of regenerative heat system between water,clear water heat storage system to law of greenhouse effects and roles of internal environment.Under different weather conditions?sunny days and cloudy days?,the heat storage and release performance of the water storage and release system and the traditional brick wall storage and release system are compared to clarify the difference between the water storage and release system and the traditional brick wall storage and release system.Under the condition of typical sunny day and typical cloudy day,different water storage and heat release systems are compared to clarify which water storage and heat release system has better performance.Based on the above tests,the following conclusions can be drawn:?1?The heat collection and release capacity of water storage and release system is better than that of traditional brick wall.?2?Under different weather conditions,the collection and heat release performance of the water circulation storage and heat release system of solar panels is the best.?3?The solar thermal collector can achieve 1.19MJ·m^-2h^-1 heat collection performance and 0.6MJ·m^-2h^-1 heat release performance under sunny conditions,and 0.55MJ·m^-2h^-1 heat collection performance and 0.26MJ·m^-2h^-1 heat release performance under cloudy conditions.?4?A set of water cycle heat storage and release system is designed in order to provide a theoretical basis for the design and simulation modeling of water heat storage and release system.