Optimal design of solar wall air heating system

Abstract

In order to effectively improve the heat utilization of solar energy, by the convection heat transfer field synergy theory, this paper studies a solar wall air heating system, analysis the flow velocity field and temperature field of the solar wall channel, and calculation the variation rules of temperature gradient direction within the channel and air flow velocity (speed ratio) with the field synergy angle and convection contribution. It is given: the temperature gradient direction leading to the different role of changes of air flow velocity with collector walls heat transfer, when the temperature gradient direction upward tilt (θ> 0°), the convection contribution increase with flow rate increase, and the greater of ¸, the more obvious of the effect; there is the optimal direction angle ¸ for every air flow speed ratio to make the largest convection contribution, from that, this study provides the useful ideas for the optimization design of the solar wall collector plate structure from.