Based on the first and second laws of thermodynamics, solar energy heat collection and the problems encountered by solar energy in the process of upgrading low-grade heat energy were theoretically analyzed by using the lumped heat capacity method. The functional relationship between the collector heat B of the collector and the collector heat mass temperature T in the solar energy heat collection process were obtained, which can be used for the selection of heat collection modes. The efficiency of heat concentrating in solar thermal utilization was influenced by selective coating design. Analysis showed that the cut-off wavelength of selective coating design should be located at the wavelength of curve intersection. It was found that the heat collection time was shortened when upgrading low-grade heat energy. By heating new working medium with less ρc, the temperature difference was formed to indirectly heat the low-grade heat energy, and the utilization rate of solar energy was improved.
JIANG Hai-yang
,
CHENG Xiao-fang
. Theoretical Analysis of Solar Energy Collection and Its Application in Promoting Low-Grade Thermal Energy[J]. Advances in New and Renewable Energy, 2019
, 7(5)
: 393
-397
.
DOI: 10.3969/j.issn.2095-560X.2019.05.002
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