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The objective of this study is to investigate the influence on the heating performance for a water-to-water 10RT ground source heat pump by using the water switching and refrigerant switching method. The test of water-to-water ground source heat pump was measured by varying the compressor speed, load side inlet temperature, and ground heat source side temperature. The heating capacity and COP of the heat pump increased with increasing ground heat source temperature. As a result, compared to a refrigerant switching method, the water switching method with counter flow improves the heating capacity and COP by approximately 5% in average, respectively.
A solution about noise of every kind happening in the inner part of a building is not very sufficient. Especially, because of diversity about living, consumption of water in a building of every kind is on the increase, and most of used water operate as drainage load. In this process, drainage noise in the drainage pipe laying generated frequently from a bathroom, a kitchen, or a various room of an apartment house like a various generation house, an apartment, villa, and a commercial building like a hotel, a motel is deteriorated a human desire about an easy life in a snug space, and extremely, it is also raise trouble each other. Accordingly, in this study, we work and set up as double structure about PVC pipe laying used of pipe laying materials in drainage pipe laying for a building of every kind, and we furnished data about drainage pipe laying noise reduction through an comparison experiment between data of research materials and that of existing about a specific character of drainage noise generated from drainage of a chamber pot and a bath tub in the building.
Excessive heat may occur during semiconductor manufacturing process. Thus, precise control of temperature is required to maintain constant ambient-temperature and also wafer-temperature in the chamber. Compared to an industrial chiller, semiconductor chiller's power consumption is very high due to its continuous operation for a year. Considering the high power consumption, it is necessary to develop an energy efficiency chiller by optimizing operation control. Therefore, in this study, an experimental study is conducted to determine the optimal refrigerant charge for the semiconductor chiller. The performance of PWM and EEV method chiller, are compared through the experiments, refrigerant circulation rate, temperature rise and fall, control precision. Optimum charge of refrigerant for the cooling capacity, 3.7 ㎾ was measured as 3.5 ㎏. For the EEV-chiller, power consumption, refrigerant circulation rate, and system pressure tends to increase. For the experiment of temperature rise and fall, the EEV-chiller takes the time of 39minutes, and the power consumption of 3.52 ㎾. For the precise control experiment, at the temperature of 0℃ the deviations are ±0.5℃ for PWM method, ±1.5℃ for EEV method.
To maintain efficiency of heat exchanger, fouling of heat transfer surface is important to remove. This study was to investigate cleaning result of plate heat exchanger using ceramic ball. The fouling is created in heat transfer surface of plate heat exchanger using CaCO₃ as the fouling subject. The fouling concentration varied from 10 mol/m³ to 20 mol/m³. The overall heat transfer coefficient recovered 97.9% for 10mol/m³ case, and 94.3% for 20 mol/m³ case in comparison with initial state. It can be concluded that the cleaning of ceramic ball contribute significantly to the of performance recovery for overall heat transfer coefficient and fouling resistance after cleaning experiment.
Excessive heat occurs during semiconductor manufacturing process. Thus, precise control of temperature is required to maintain constant chamber-temperature and also wafertemperature in the chamber. Compared to an industrial chiller, semiconductor chiller’s power consumption is very high due to its continuous operation for a year. Considering the high power consumption, it is necessary to develop an energy efficient chiller by optimizing operation control. Therefore, in this study, a semiconductor chiller is experimentally investigated to suggest energysaving direction by conducting load change, temperature rise and fall and control precision experiments. The experimental study shows the cooling capacity of dual-channel chiller rises over 30% comparing to the conventional chiller. The time and power consumption in the temperature rising experiment are 43 minutes and 8.4 kWh, respectively. The control precision is the same as ±1℃ at 0℃ in any cases. However, it appears that the dual channel’s control precision improves to ±0.5℃ when the setting temperature is over 30℃.
본 연구의 목적은 EEV를 적용한 냉매절환과 수 절환에 의해 변하는 10RT급 지열히트펌프의 성능을 평가하고자 하볐다. 지열히트펌프의 냉난방 용량 및 성능실험은 10RT급 물 대 물 지열히트펌프의 EEV의 개도변화를 통하여 파악하였다. 본 히트펌프는 EEV의 개도가 커질수록 COP 및 냉난방능력이 상승하는 것을 확인하였다. 결과적으로, 대항류 수절환 방식이 냉매 절환 방식에 비해 평균적으로 약 5~8% 로 COP와 냉난방능력이 높은 것을 확인하였다. The objective of this study is to investigate the influence of the cooling and heating performance for a water-to-water 10RT ground source heat pump by using the water switching and refrigerant switching method for EEV. The test of water-to-water ground source heat pump cooling, heating capacity and COP was measured by varying the EEV open degree. The cooling, heating capacity and COP of the heat pump increased with increasing EEV open degree. As a result, compared to a refrigerant switching method, the water switching method with counter flow improves the cooling, heating capacity and COP by approximately 5~8% in average, respectively.