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Articles by S. Rittidech
Total Records ( 7 ) for S. Rittidech
  P. Meena , S. Rittidech and P. Tammasaeng
  This research aims to the effect of evaporator section lengths and working fluids on operational limit of closed loop oscillating heat pipes with check valves (CLOHP/CV) with R123 Ethanol and Water were used as the working fluids. A set of CLOHP/CV was made of copper tubes in combination of following dimension: 1.77 mm inside diameter: 10 turns: 5, 10 and 15 cm equal lengths for evaporator, adiabatic and condenser sections. 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 volume water in a cold bath. The adiabatic section was properly insulated. In the test operation. Which the temperature at the adiabatic section was controlled at 60°C in steady-state condition. From The obtained results obtained, it could be concluded as follows. When the evaporator lengths increased from 5 cm to 10 and 15 cm the critical heat transfer flux decreased. There was working fluids change from R123 to Ethanol and water the critical heat flux decreased.
  S. Rittidech and K. Phalasin
  This heat transfer characteristics of a closed-end oscillating heat-pipe (CEOHP) depend on a number of parameters. They are the number of turns, inner diameter of the tube, aspect ratio and the dimensionless parameters of heat transfer. The CEOHPs used employed a copper tube with inner diameter of 0.66, 1.09 and 2.03 mm. The lengths of the evaporator, adiabatic and condenser sections were equal and changed to 50,100 and 150 mm. R141b was used as the working fluids with filling ratio of 50% by total volume. The meandering turns of 10, 20 and 40.The evaporator section was heated by hot water and the condenser section was cooled by distilled water. The experimental inclination angles were 0, 20, 40, 60, 80 and 90 degree from the horizontal plane. The controlled temperature at the adiabatic section of 50ºC. When the system reached the steady state, the temperature and the flow rate of the cooling substance was recorded in order to calculate the heat transfer rate of the CEOHPs. The experimental results showed that the heat flux decreases with an increasing number of turn and decreases with an increasing aspect ratio. The heat flux increases with an increasing inner diameter. A correlation to predict the heat transfer rate at vertical position can be established.
  S. Rittidech , A. Boonyaem and P. Tipnet
  The CEOHP cooling module consisted of two main parts, i.e. the aluminum housing and the CEOHP. The house casing was designed to be suitable for CEOHP. The housing to drilling for insert the CEOHP. The CEOHP design employed copper tubes: two sets of capillary tubes with an inner diameter of 0.002 m, an evaporator length of 0.05 and condenser length of 0.16 m and each of which has six meandering turns. The evaporator section was embraced in the aluminum housing and attached to the thermal pad of Pentium 4 CPU, model SL 6 PB, 2.26 GHZ. While the condenser section was embraced in the cooling fin housing and cooled by forced convection. R134a was used as the working fluid with filling ratio of 50%. In the experiment, the CPU chip with a power of 58 W was 70°C. Fan speed of 2000 and 4000 rpm. It was found that, if fan speed increases the cooling performance increases. The CEOHP cooling module had better thermal performance than conventional heat sink.
  P. Meena and S. Rittidech
  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.
  P. Meena , S. Rittidech and P. Tammasaeng
  This research was to study the effect of inner diameter and inclination angles on operation limit of a Closed Loop Oscillating Heat Pipes with Check Valves (CLOHP/CV). A set of CLOHP/CV was made of copper tubes in combination of following dimension: 1.77 and 2.03 mm inside diameter: 10 turn, with R123 was used as the working fluid. The working fluid was filled in the tube at the filling ratio of 50%. The inclination angles were 0, 20, 40, 60, 80 and 90° with 5 equal lengths for evaporator, adiabatic and condenser sections. The evaporator section was given heat by heater while the condenser section was cooled by volume water in a cold bath. The adiabatic section was properly insulated. In the test operation, it could be concluded as follows. It indicated that when the inner diameter changed from 1.77-2.03 mm the critical temperature increased. And when increase the inclination angles from 0 until to 90° the critical temperature increased.
  P. Meena and S. Rittidech
  This study aims to design, construct and test the waste heat recovery by closed-loop oscillating heat pipe with check valve from pottery kilns for energy thrift, were used the working fluids with a filling ratio of 50%. The (CLOHO/CV) was made of copper capillary tube with inside diameter of 2.03 mm. The lengths of evaporator and condenser section were 20 cm. The lengths of adiabatic section 10 cm. The number of turn was 40 meandering turns. The ratio of number of check valves was 0.04. The evaporator section was heated by hot gas, while the condenser section was cooled by fresh air. From the experiment, it indicated that the working fluid changes form water to R123, the heat transfer rate increased to 4,800 and 7,900 Watts and the effectiveness increased from 0.32 to 0.44. The CLOHP/CV heat exchanger can reduce the quantity of using gas in pottery kilns and achieve energy thrift.
  T. Moontree , S. Rittidech and S. Thongdaeng
  This research aims to study the application of a thermosyphon heat exchanger for cooling of hydraulic oil in sugarcane harvester. The objective was to control hydraulic oil temperature to reduce an over-heat problem for the engine and the hydraulic system. The thermosyphon heat exchanger was made of 90 copper tubes with inner diameter of 18 mm. The evaporator and condenser section length were equal to 200 mm and adiabatic section length of 100 mm. R134a, ethanol and water were used as working fluids with a filling ratios of 30, 50 and 80% by total volume. The air flow rate inlets at the condenser were 2.3, 2.6 and 2.8 m sec-1. In the testing, hot hydraulic oil passed through the evaporator section and air passed through the condenser section. The results show that the thermosyphon heat exchanger reduced the hydraulic oil temperature from 80 to 62°C. The maximum heat transfer rate and effectiveness were occurred as an air velocity of 2.3 m sec-1 with R134a as working fluid and filling ratio of 50% by total volume.
 
 
 
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