냉동기 오일 변화량에 따른 군용 장갑차 에어컨 성능 특성

Abstract

Performance Characteristics of Air Conditioning in Military Armored Vehicles with Charging Rate of Refrigerator Oil Chan Hee Kim Department of Refrigeration and Air-Conditioning Engineering, The Industrial Graduate School, Pukyong National University Abstract Developed by the disposal of CFC refrigerants, HFC134a refrigerants are commonly used in small air conditioners such as automotive air conditioners and home refrigerators. HFC134a refrigerant was developed as a substitute for CFC 12, but due to physical properties differences, it is not possible to use the refrigerant oil(mineral oil) used in CFC12 The refrigerant oil suitable for HFC134a refrigerants is synthetic oil PAG(Poly-Alkylene Glycol). These refrigerats oils are widely used in automotive air conditioners. At present, air conditioning is getting smaller and smaller, and its impact on heat transfer efficiency is increasing, but its review is insufficient for the effect of refrigerant oil on freezers. In general, the refrigerant oil of the air conditioner that we commonly use around us is used to improve the durability of the compressors, and the total amount of such refrigerats oil is determined based on the data provided by the compressor manufacturer and is charged and purchased inside the compressor when purchasing the compressor. Therefore, the effect of refrigerant oil on the air conditioner can cause deviation of the cooling performance of the refrigerator calculated theoretically, and to solve this problem, the compressor is changed rather than changing the total volume of the refrigerant oil. As such, it is common for air conditioners in the private sector such as home and automobile businesses, which we usually purchase, to develop compressors and heat exchangers in the product development phase, or to develop new products according to the compressors already in use. In addition, when purchasing air conditioners in the private business sector, products that are not operated by compressors are purchased with the refrigerant oil and refrigerant injected into them, and are installed in house or car. On the other hand, in order to deliver the product, the military armored vehicle air conditioner must be delivered with a report after completing the test for all products by the KOLAS certification authority before delivery, except in some special cases. Because compressors are naturally test operated, the product's durability and performance deviation are shown by the change in the total amount of refrigerant oil in the air conditioner, which results in the total quantity change of the product during heat exchanger or posttest release of the refrigerant. The purpose of this study is to demonstrate through objective data the change in cooling performance caused by the change in the total amount of refrigerants oils in the above special circumstances, to provide experimental results as a basic design data on the effect of the change in the total amount of compressor oil on the air conditioners, and to minimize performance change by setting the margin of error on the filling quantity of the refrigerants oils.