A
solar heat collector with a film hole structure comprises a heat preservation box with the upper end open, a phase-change material layer is arranged in the heat preservation box, a coiled
pipe is arranged in the phase-change material layer, a conical
metal foam layer is arranged at the top of the phase-change material layer, the outer wall of the conical
metal foam layer is wrapped by a transparent outer layer which can transmit light, and
metal foam is added into the phase-change material layer. The content of air in a heat collecting area is greatly increased due to the
metal foam structure, an
air layer is divided into parts with small volumes, and therefore heat loss caused by
convection is prevented.
Sunlight can illuminate the conical
metal foam layer through the transparent outer layer, the conical
metal foam layer has the function of a heat absorber and converts
light energy into
heat energy, and the transparent outer layer has the function of a heat insulating layer and prevents heat in the heat absorber from being dissipated to the outside. The
solar heat collector can effectively absorb solar
radiation and fast store the energy and can be widely used for
drying,
food processing, household heat supplying , cooking and the like.