Effect of position of heat mode to heat transfer of a closed loop oscillating heat pipe with check valves on fins

This research aimed to determine the effect of position of heat mode to closed loop oscillating heat pipe with check valves (CLOHP/CV) on fins. To check on heat transfer rate needed to focus on evaporator temperature, air velocity, and position of heat mode. All heat exchangers used ethanol as working fluid with the filling ratio of 50% by total volume of tube, evaporator temperature at 60, 70, and 80 degrees Celsius, and air velocity at 0.5, 1.0, and 1.5 meter per second, size of fin was 0.5 centimetre. All heat exchangers used different positions at evaporator section and condenser section of heat pipe. The CLOHP/CV was made from copper capillary tube of (inner diameter: 5 mm), 24 turns 2 check valves. The length of evaporator and condenser and adiabatic section is 20, 20, and 10 centimetre respectively. From the experiment it's was found that the heat exchanger of bottom heat mode had a temperature of 80 degrees Celsius and air velocity of 1.5 m/s with heat flux and thermal effectiveness the highest.