In this research, the heat and flow analysis in a condenser of vehicle HVAC system was investigated numerically regarding the different shapes of the condenser tube. The velocity, pressure, and temperature distribution of the test fluid(R-134A) inside the tube were numerically calculated for the optimum design of the condenser tube for two different length with four different inlet velocities. In addition, the local pressure and temperature distributions for total tube length were calculated and the variation of pressure drop of the R-134A with flow rate were also calculated numerically. The tube at case 1 with less curved elbows was determined for the better design than case 2 in the aspect of energy-effective shape of the condenser tube.

This study is about comparison of thermal and flow characteristics on the wind & radiant heat shield with STS mesh type screen for offshore plant. Numerical analysis was conducted to find transmission coefficient in the mesh and then analyse the flow characteristics about wind & radiant heat shield. The experiment method of solar radiation has been used as thermal radiation source to get the performance of radiant heat shield measurement. The sensor radiation device has been used to measure the reduction of solar radiation with various size of cells and at a distance of 0.5m and 1m from the cold face of the wind & radiant heat shield. The present study show reduction in radiation heat flux as various distance from the cold face of the radiant heat shield. Experimental results are presented for different type of mesh and distance of measurement.

원자력을 이용한 황-요오드 수소생산 공정 중 황산용액을 이송하는 기존의 시스템과 달리 새로운 황산 이송장치는 벨로우즈 박스 내에서 벨로우즈 외측으로 고온 부식성 액체인 황산이 흐르고, 벨로우즈 내측으로는 냉각수가 흐르는 상태에서 주기 운동을 통해 황산용액이 펌핑 되도록 구성된다. 200 ℃ 이상의 고온 부식성 액체인 황산용액을 정량으로 이송할 수 있도록 장치의 주요부품인 벨로우즈 주변의 열해석을 통해 온도분포를 확인하여, 테프론 재질의 벨로우즈의 내식성 및 내열성을 파악하고, 장치의 안전하고 효율적인 운용을 위한 기초자료를 취득하고자 하였으며, 냉각수 입구직경 3 ㎝, 질량유량이 3.9199 ㎏/s로 고정한 경우 벨로우즈의 길이에 관계없이 테프론 변형온도 이하임을 알 수 있었다.

An experimental method, based upon wall visualizations, has been developed to observe air flow near a plane wall around a row of five 45° inclined jets discharging into a cross stream. This study concerns the variation of injection rate R which is one of the most important parameters governing this flow type. The Results are concentrated on the spatial evolution of two lobes with R. These structures are fastened to jets downstream edge and exist for very low injection rate values which are an indication of jets takeoff at the immediate downstream of injection orifices. The velocity rate of 0.42 marks a change in the structure alimentation system.

The properties of pyrolytic carbon (PyC) deposited from C2H2 and a mixture of C2H2/C3H6 on ZrO2 particles in a fluidized bed reactor were studied by adjusting the deposition temperature, reactant concentration, and the total gas flow rate. The effect of the deposition parameters on the properties of PyC was investigated by analyzing the microstructure and density change. The density could be varied from 1.0 g/cm3 to 2.2 g/cm3 by controlling the deposition parameters. The density decreased and the deposition rate increased as the deposition temperature and reactant concentration increased. The PyC density was largely dependent on the deposition rate irrespective of the type of the reactant gas used.