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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2004.10
- 수록면
- 814 - 822 (9page)
이용수
초록· 키워드
오류제보하기
The issue of ozone destruction has been recently a world-wide problem was originated from a thesis presented by professor Rolend and Dr. Moreena in 1974. Since then, production of specific Freon matters such as R-ll, R-12 and R-502 that have been used as refrigerants of industrial refrigerating systems has been completely prohibited since January 1. 1996.
There are a wide variety of refrigerants that have been applied for refrigerating systems, but production and use of HCFC refrigerants have been controlled because they have been classified as matters that destruct earth environment. HFC refrigerants as developed alternatives of HCFC ones have been marketed, but they have a problem such as complicated selection of refrigerating oil and lowering of heat transfer rate. In particular, they are not environmentally-friendly because they have high GWP(Global Warming Potential), and it is very difficult to select refrigerants and further development to solve the problem is in progress.(1-4) The matters that can be used as refrigerants of those that have been frequently used in chemical manufacturing, oil refining, petrochemical industry and fertilizer production include ammonia, an mineral compound, propane and propylene as hydrocarbon. They are easy and cheap to obtain as they are natural gases, and in particular, environmentally- friendly.
Of them, an ammonia refrigerant has been widely used at a wide range of temperature as seen in Table 1. It has a high, COP and heat transfer rate and because of its high critical temperature and pressure, it is superior asa refrigerant, but it has disadvantages such as toxicity, inflammability and explosiveness.(5,6)
As heat exchangers that have been applied for ammonia refrigerating systems, a Shell & Tube type condenser and a flooded evaporator have been used, but because of their large size, large space for installation and more amount of refrigerants are needed.
Therefore, to solve the problem, this study conducted a performance test on change of superheat temperature according to condensing pressure using a Shell & Disk type optimum heat exchanger which can minimize the amount of a refrigerant and allow its minimum leakage. Based on the results of the test, this study planned to improve energy efficiency, preserve earth environment, and seek industrial safety. And through reduction of installment area, economic value is expected.
There are a wide variety of refrigerants that have been applied for refrigerating systems, but production and use of HCFC refrigerants have been controlled because they have been classified as matters that destruct earth environment. HFC refrigerants as developed alternatives of HCFC ones have been marketed, but they have a problem such as complicated selection of refrigerating oil and lowering of heat transfer rate. In particular, they are not environmentally-friendly because they have high GWP(Global Warming Potential), and it is very difficult to select refrigerants and further development to solve the problem is in progress.(1-4) The matters that can be used as refrigerants of those that have been frequently used in chemical manufacturing, oil refining, petrochemical industry and fertilizer production include ammonia, an mineral compound, propane and propylene as hydrocarbon. They are easy and cheap to obtain as they are natural gases, and in particular, environmentally- friendly.
Of them, an ammonia refrigerant has been widely used at a wide range of temperature as seen in Table 1. It has a high, COP and heat transfer rate and because of its high critical temperature and pressure, it is superior asa refrigerant, but it has disadvantages such as toxicity, inflammability and explosiveness.(5,6)
As heat exchangers that have been applied for ammonia refrigerating systems, a Shell & Tube type condenser and a flooded evaporator have been used, but because of their large size, large space for installation and more amount of refrigerants are needed.
Therefore, to solve the problem, this study conducted a performance test on change of superheat temperature according to condensing pressure using a Shell & Disk type optimum heat exchanger which can minimize the amount of a refrigerant and allow its minimum leakage. Based on the results of the test, this study planned to improve energy efficiency, preserve earth environment, and seek industrial safety. And through reduction of installment area, economic value is expected.
목차
Nomenclature
Abstract
1. Experimental Equipment and Procedure
2. Results and Discussions
3. Conclusion
References
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