Calculation of free-convective heat transfer in flat solar air heaters

The article discusses the issue of calculating convective heat transfer in the channel of a flat solar air heater, when the air flow rises due to thermogravitational convection in the heater channel. To obtain a formula for calculating heat transfer, the authors use the heat balance and heat transfer equations compiled for conditions of free movement of the coolant. A feature of this calculation is the calculation of the mass flow rate of the air coolant, based on the use of the concept of flow velocity, which arises due to the influence of volumetric force due to the difference in air densities.

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