설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제18권5호
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  • Pages.434-442
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  • 2006
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  • 1229-6422(pISSN)
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  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지

$CO_2$ 초임계 사이클을 위한 일체형 스크롤 팽창기-압축기 성능해석

Performance Analysis of Scroll Expander-Compressor Unit for $CO_2$ Transcritical Cycles

  • 발행 : 2006.05.01
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초록

In a two-stage compression $CO_2$ transcritical cycle, application of a scroll expander-compressor unit has been considered in order to improve the cycle COP. For both expander and 1st stage compressor, scroll wrap profile which was originally designed for a R410A air-conditioning cycle mechanism was used with minor modifications: wrap height and involute end angle were adjusted for required displacement volume and built-in volume ratio. For pressure condition of 10 Mpa/3.5 MPa and expander inlet temperature of $35^{\circ}C$, 25% improvement in COP was obtained by using expander-compressor unit. As evaporator pressure increased, COP improvement was lowered mainly due to decreasing compressor peformance.

키워드

참고문헌

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