Mathematical modeling of accumulation heat in solar greenhouses

The article discusses a mathematical model of the process of dynamic thermal accumulation in solar greenhouses.In solar installations, thermal storage is the most important form of energy storage.Therefore, heat storage systems are integral parts of low-temperature solar installations.Particularly in solar heating systems, solar greenhouses and dryers. Heat accumulation in solar greenhouses is based on indirect methods - heat transfer to a heat storage medium through a heat exchange medium.The heat storage medium - mass - can be water, nozzle, soil, and the heat exchange medium- coolant - is air. The coolant circulation is forced. The operating mode of the thermal accumulator is regenerative.Traditionally, heat accumulators are placed in the volume or soil of the greenhouse and, as a result, heat losses through the shell of the heat accumulator ultimately return to the greenhouse, therefore, heat losses in the heat accumulator are not taken into account when calculating.To compile a mathematical model of the dynamic mode of a heat accumulator, the following assumptions are made: - the thermophysical parameters of the coolant (air) and the material of the heat accumulator are assumed to be constant; - air temperature along the length of the heat accumulator changes linearly; -heat loss through the shell of the heat accumulator is not taken into account.The heat balance equation at the air-mass interface of the thermal accumulator and the control function are the function of turning the fan on and off in charging mode and in discharging mode of the thermal accumulator