The thermoelectric module is a device that works by using the Peltier effect when electrical power supplied on it. In this study, the thermoelectric module is applied as thermoelectric cooler (TEC) using air cooling heat sink where cooling box capacity is 22 L. This paper experimentally investigates the thermal performance of thermoelectric cooler with a variation on input power and cooling load. The investigation has been conducted by three variations on input power (50.5W, 72.72W and 113.64W) and by two variations of the cooling load using mineral water (1440 mL and 2880 mL) with input power 113.64W. The box temperature achieved at input power 50.5W, 72.72W and 113.64W are 19.98oC, 19.77oC and 18.52oC, respectively. While at the cooling load of 1440 mL and 2880 mL, the temperature achieved in the box are 22.45oC and 23.32oC, respectively. The test results showed that in variation on the input power from low to high, the temperature in box becomes lower on high input power and causes the lower of COP, this is because more energy could be absorbed on high input power. In the cooling load variation, the greater the cooling load given in cooling box, then the longer the box temperature stability can be achieved because of more energy needed for decreasing the temperature of cooling box.
This paper reports an experimental investigation of the performance split air conditioner (AC) with and without combined coil (trombone coil condenser) as heat pump water heater. The coil is a heat exchanger that is placed between the compressor and the condenser (main condenser) by utilizing the heat rejection. The coil is placed in an insulated water storage tank with a capacity of 50L. Data are captured every 5 minutes during the 120 minutes of testing, where the room temperature is maintained at temperatures of 20 o C, 23 o C and 27 o C with variation of the cooling load at 1000W, 2000W and 3000W respectively.The results indicated that the use of coil increases the performance of air conditioner as an cooling air in room and water heater in reclamation tank simultaneously. The use of coil causes a slight increase in compressor power 0.014 kW (2%), where the COP increases around 12% higher than the increase in compressor power percentage, which is used as a water heater. Condenser temperature and room temperature with coil slightly rise compared to without coil at the cooling load increase. The finding indicates that the addition of the coil generates free hot water with temperature range around 61.54 o C-64.33 o C.The application of AC combined with water heater using coil does not affect the cooling performance but it can improve the energy performance considerably for cooling and energy saving for heating water.
The Air Source Air Conditioning Water Heater (ASACWH) performance as an energy source to heat water in the tank using dummy condenser type of trombone coil with different diameter and pipe length without hot water circulation has been investigated. The diameter and length of the dummy condenser pipe are intensely affected by ACWH performance. In this study, cooling capacity, Coefficient of Performance (COP), compressor power and room temperature were evaluated in three types of trombone coil (6.4 mm coil diameter with a length of 7.9 m, 6.4 mm coil diameter with a length of 5.3 m, and 9.5 mm coil diameter with a length of 5.3 m) with different cooling load variation. This study used cooling load with a variation of 0 W, 1000 W, 2000 W, and 3000 W without hot water circulation in the simulation room. It was found that the ASACWH using a pipe with a coil diameter of 6.4 mm and length of 7.9 m performed the highest cooling capacity and COP, and produced more comfortable room temperature than the other two pipes. The results indicated that when the cooling load icreased from 0 W to 3000 W, the compressor power increased by 11.3%, 6.3%, and 9.3%, using the 6.4 mm coil diameter with 7.9 m length, 6.4mm diameter of the coil with 5.3m length and 9.5mm coil diameter with 5.3m length, respectively.
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