The Study Of Heat Transfer Of Loop Heat Pipe Of Solar Boiler

Parabolic trough collector(PTC) can concentrate the sunlight on the receiver to heat the working fluid in the receiver, so heat can be got from the working fluid. PTC is widely used in the field of electricity generation, air-condition, weaving, paper making, desalination, and so on.In the application of medium temperature solar enegry, of which temperature being from 100℃to 200℃, it's difficult for the unconcentrating concentrators to reach the higher temperuatre, and the parbaolic trough collector requires a complex tracking system and it costs expensively, therefore, the compound parbaolic concentrator(CPC) has a bright prospect of application.This paper discusess the PTC from the aspects of theory and experiment. The structure,material choosing of the concentrator,receiver and tracking system and the priciples of optics are all included in the theory. In the aspect of experiment, the temperature of receiver are measured, and the influence of the solar immediacy irradiance on the temperature is analysed. The results of the experiment concludes that, the temperature of the receiver increases as the solar immediacy irradiance enhances.As a necessary application, this paper designs a compound parbaolicconcentrator(CPC), of which half-acceptance angleθ_A = 30°. According to the analysis of heat transfer performance on solar enegry collector, calculation methods were put forward which can determine the overall heat loss coefficient and collector efficiency of heat pipe evacuated tubular collector. The result of example indicates that, the efficiency of the compound parabolic collector can achieve as far as from 33% to 37%. As a non-tracking collector, that is satisfied.