Experimental investigation of straight shape thermosyphon filled with R410A refrigerant

Abstract

This paper investigated the thermal performances of a straight shape thermosyphon filled with R410A refrigerant subjected to low heat flux from 1882 W/m2 to 4423 W/m2 and evaporator wall temperatures between 20 °C and 40 °C with fill ratios 0.75 and 1.00 and at different inclinations from 45° to 90°. The axial temperature distribution of the thermosyphon was found to be uniform for all temperature differences of evaporator at all power inputs. It was found that the performance of the thermosyphon which is determined from the heat transfer capability of the thermosyphon depends on inclination angle and fill ratio. Experimental results show that the heat transfer coefficient increases as the heat input increase while thermal resistance decreases exponentially with increasing input power. Increase infill ratio and inclination angle at various heat input contributed to a better thermosyphon performance, at where heat transfer was highest at fill ratio 1.00 and inclination angle of 68°.