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현장에서 운전중인 터보냉동기의 성능 측정과 전력 소비량 예측
장영수,신영기,김영일,백영진,Jang, Yeong-Su,Sin, Yeong-Gi,Kim, Yeong-Il,Baek, Yeong-Jin 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
This paper presents an overview of testing and analyzing field performance of a centrifugal chiller which has a rated capacity of 200 RT(703 kW). Field data of a chiller installed in the cleanroom research building of KIST has been collected far performance analysis. The operating data included start-up, shut-down, and quasi-static state where cooling capacity and compressor power consumption varied cyclically. It was found that the steady-state thermodynamic model could be applied to relate the cooling capacity and COP under quasi-static conditions. The results led to finding the required cooling load pattern and a possible energy saving method. This study provides a method of evaluating performance of a large capacity centrifugal chiller in which field test is necessary.
장영수,Jang, Yeong-Su 축산물품질평가원 2008 KAPE누리 Vol.147 No.-
좋은 고기를 얻기 위해서는 도축하기 전에 가축을 가능한 한 안정시키지 않으면 안 된다. 소와 돼지는 도축장에 출하될 때 거의 트럭에 실려 오는 것이 일반적인데 운송도중에 차안에서 타박상을 입거나 골절되는 경우가 많기 때문에 주의가 필요하다. 뿐만 아니라 시간을 절약하기 위해 적정두수를 벗어나 과도하게 많이 적재하는 경우가 많기 때문에 여름과 같이 온도가 높은 때는 질식사하는 가축도 발생한다.
탄화수소 냉매를 사용한 냉방시스템의 성능 및 열전달 특성
장영수,김민수,노승탁,Jang, Yeong-Su,Kim, Min-Su,No, Seung-Tak 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.5
Performance and heat transfer characteristics of an air conditioning system filled with hydro- carbon refrigerants are experimentally investigated. Single component hydrocarbon refrigerants (propane, isobutane, butane and propylene) and binary mixtures of propane/isobutane and propane/butane are considered as working fluids in the air conditioning system. Performances of each refrigerant are obtained at several compressor speeds and temperature levels of secondary heat transfer fluids. The cooling capacity and the coefficient of performance are obtained as test results. Heat transfer data of selected refrigerants are achieved from overall conductance measurement. Average heat transfer coefficients at different mass fluxes are shown and they are also displayed for different heat capacities of the system. Experimental results show that some hydrocarbon refrigerants have better characteristics than R22.