[국내논문]고속 회전축 냉각용 루우프 히트파이프 열교환기의 응축열전달 특성에 관한 연구 A Study on the Condensation Heat Transfer Characteristics of a Loop Heat Pipe Heat Exchanger for High Speed Rotary Shaft Cooling원문보기
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer...
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer pipes were installed in the heat exchanger. According to the experimental results, as the spaces between the internal discontinuous pins decreased, the frequency of pressure drops increased and changes in temperature at the outlet of the condenser were shown to be a little smaller. Therefore, we can see that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. For the loop heat pipe heat exchanger consisting of a condenser with internal and plate fins, as the temperature of the air flowing into the condenser increased, the condensation heat transfer rate also increased, and as the condenser refrigerant inflow temperature increased, the condensation heat transfer rate increased as well.
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer pipes were installed in the heat exchanger. According to the experimental results, as the spaces between the internal discontinuous pins decreased, the frequency of pressure drops increased and changes in temperature at the outlet of the condenser were shown to be a little smaller. Therefore, we can see that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. For the loop heat pipe heat exchanger consisting of a condenser with internal and plate fins, as the temperature of the air flowing into the condenser increased, the condensation heat transfer rate also increased, and as the condenser refrigerant inflow temperature increased, the condensation heat transfer rate increased as well.
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가설 설정
1. As the spaces between internal discontinuous pins decreased, the condensers with internal fins and external plate fins pressure drops increased.
2. Changes in the temperatures at the outlet of the condensers with internal fins and external plate fins were shown to be a little smaller. Therefore, it can be seen that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased.
제안 방법
The refrigerant used in the experiment is 134a. The experiment was conducted with the quantity of the refrigerant filled in the condensers with internal fins and external plate fins in a range of 6~9 kg. The air flowing in the condenser was in a range of 0.
The simulations were implemented with 0.5 mm thick internal pins at angles of 110° under three length conditions; 50 mm, 75 mm, and 100 mm.
대상 데이터
The outside diameter of the conveying pipe that connects the evaporator and the condensers with internal fins and external plate fins is 50 mm. The experimental data were measured and recorded using a Hybrid Recorder. A refrigerant flowmeter was installed at the condensers with internal fins and external plate fins outlet tube to measure the condensate refrigerant flow rate.
3 shows the condenser heat exchanger. The condenser is 480 mm wide, 1000 mm long and 68 mm high.
Eighty 12 mm diameter, 1,000 mm long copper pipes were installed on the condensers with internal fins and external plate fins. In addition, exhaust valves were attached to the condenser so that the working fluid can be filled and non-condensable gases can be exhausted.
8 show the results of condenser temperatures following changes in the temperature of the cooing are flowing in the condenser. The refrigerant used in the experiment is 134a. The experiment was conducted with the quantity of the refrigerant filled in the condensers with internal fins and external plate fins in a range of 6~9 kg.
성능/효과
3. As the temperature of the air flowing in the condensers with internal fins and external plate fins increased, the condensation heat transfer rate of the heat exchanger of loop heatpipe heat exchanger consisting of a condenser with internal fins and external plate fins increased.
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