Release Time:2019-03-11  Hits:

Indexed by: Conference Paper

Date of Publication: 2013-01-01

Included Journals: CPCI-S

Volume: 608-609

Page Number: 27-+

Key Words: heat conduction oil; solid particles; photo-thermal performance; solar irradiation

Abstract: The photo-thermal performance tests of heat conduction oil were made in an all-glass evacuated solar collector tube under solar irradiation. The influences of solid particles (carbon powder, copper foil, aluminum foil) with different mass fraction and sizes on insolation temperature and irradiation were investigated. The mechanism of convective heat transfer enhancement of solid particles in oil was discussed. The results show that copper foil particles oil can improve average insolation temperature 14 degrees C. The carbon powder-oil insolation temperature is the highest, it is 3.3 degrees C higher than copper foil-oil's and 7 degrees C higher than aluminum foil-oil's in the same mass fraction; The appropriate mass fraction of copper foil particles is 3%-3.2%, and continue to increase particles mass fraction the temperature did not change significantly.Within millimeter-scale range,the convective heat transfer enhancement is related to particle size, the effect of different sizes copper foil particles on oil temperature is 1-4 degrees C; Solar irradiation of carbon powder-oil and copper foil-oil are lower and their photo-thermal conversion properties show better than that of aluminum foil-oil in the insolation experiment.