| 摘要 |
PURPOSE:To contrive to reduce the radiation loss from the outside surface of a closed vessel and to improve the heat collection efficiency by a structure wherein heat storage material by latent heat is packed in the closed vessel formed out of light-transmitting material and yet a tubular absorber with blackened surface is attached in the closed vessel. CONSTITUTION:The heat storage material by latent heat 2 such as polyethylene glycol is packed in the closed vessel 1 formed out of light-transmitting material such as polymethyl methacrylate-type resin and yet the tubular absorber 3 such as copper with blackened surface is attached in the closed vessel 1. Accordingly, light transmits the wall of the vessel 1 and the heat storage material 2 and then is absorbed by the absorber 3 in order to collect heat. Consequently, the temperature of the absorber 3 becomes high, resulting in melting the heat storage material 2 and at the same time producing the distribution of temperature which gradually lowers from the absorber 3 inside the vessel 1 toward the wall of the vessel 1. As a result, the radiation loss from the outside surface of the vessel 1 is reduced, resulting in improving the heat collection efficiency. Furthermore, because of the tubular absorber 3, fluid can be past inside the absorber 3, resulting in facilitating the recovery of the heat. |
