Abstract
This research was to study the comparisons of heat transfer performance of closed-looped oscillating heat pipe and closed-looped oscillating heat pipe with check valves heat exchangers with R134a, Ethanol and water were used as the working fluids. A set of heat pipe heat exchanger (CLOHP and CLOHP/CV) were made of copper tubes in combination of following dimension: 2.03 mm inside diameter: 40 turns, with 20, 10 and 20 cm for evaporator, adiabatic and condenser sections lengths. The working fluid was filled in the tube at the filling ratio of 50%. The evaporator section was given heat by heater while the condenser section was cooled by air. The adiabatic section was properly insulated. In the test operation, it could be concluded as follows. It indicated that the heat transfer performance of closed-looped oscillating heat pipe with check valves heat exchanger better than closed-looped oscillating heat exchanger.
Highlights
The heat pipe is the high efficient heat transfer devices
The check valve is a floating type valve that consists of a stainless ball and copper tube, in which ball stopper and conical valves seat are provided at the ends, respectively
The check valves: The check valve is a floating type valve that consists of a stainless ball and copper tube, in which ball stopper and conical valves seat are provided at the ends, respectively
Summary
The heat pipe is the high efficient heat transfer devices. Akachi et al.,[1]. Meena et al, [6] studies the effect of evaporator section lengths and working fluids on operational limit of Closed Loop Oscillating Heat. Rittidech et al.,[9] studies the effect of evaporator lengths and ratio of check valves to number of turns on internal flow patterns of a closed-loop oscillating heat. To study the effect of temperature of a closedlooped oscillating heat pipe and closed-looped oscillating heat pipe with check valves heat exchangers on the heat transfer rate. To study the effect of working fluids of a closedlooped oscillating heat pipe and closed-looped oscillating heat pipe with check valves heat exchangers on the heat transfer rate. To study the effect of working fluids of a closedlooped oscillating heat pipe and closed-looped oscillating heat pipe with check valves heat exchangers on the effectiveness. The ball can move freely between the ball stopper and the valves seat in shown Fig. 4
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