• 제목/요약/키워드: Refrigerant-supplying Equipment

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냉장고 증발기 배관의 2상유동양식 예측 및 소음 평가 (Prediction of Two-phase Flow Patterns and Noise Evaluation for Evaporator Pipe in a Refrigerator)

  • 허소정;김민성;한형석;정의봉
    • 한국소음진동공학회논문집
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    • 제21권10호
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    • pp.916-923
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    • 2011
  • The refrigerant after the expansion valve interchanges the heat at the evaporator. At this moment, the state of gas and liquid becomes two-phase flow and causes irregular noise. In order to avoid the noise, the two-phase flow pattern should be predicted. In this paper, the procedure to predict the two-phase flow patterns such as churn flow and annular flow was suggested using the CFD software. The experiments using refrigerant-supplying equipment was carried out and the noise levels according to the flow pattern were measured. The flow patterns predicted by this procedure showed good agreement with those by experiments. The churn flow is noisier than annular flow pattern.

증발기 입구 배관의 구조 개선을 통한 냉장고 냉매 소음 저감 (Reduction of Refrigerant-induced Noise of the Refrigerator by Modification of the Evaporator Inlet Pipe)

  • 김민성;한형석;김태훈;정의봉
    • 한국소음진동공학회논문집
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    • 제19권10호
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    • pp.1012-1020
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    • 2009
  • This research is focused on the experimental study of the noise induced by two-phase refrigerant flow in the evaporator. The two-phase flow in the evaporator has various flow patterns. The effects of two-phase flow pattern's characteristics on the noise of the evaporator are investigated experimentally. The experimental data shows that the generated noise is mainly related to the layout of the pipe and the certain two-phase flow patterns such as the churn and slug flow. Based on these results, we removed the unnecessary vertical pipe and changed the pipe diameter of the evaporator - inlet into small one in order to avoid the intermittent flow condition. The noise level of newly-designed inlet-pipe of the evaporator was measured experimentally by refrigerant-supplying equipment and compared with that of conventional one.

냉장고 냉매소음 저감을 위한 단열 발포재의 진동 전달특성 분석 (Analysis of the Vibration Transmitting Characteristics of the Insulation-foam for Reducing Refrigerant-induced Noise of a Refrigerator)

  • 한형석;김민성;정의봉;서민영;이수영
    • 한국소음진동공학회논문집
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    • 제20권1호
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    • pp.45-50
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    • 2010
  • In the refrigerator, the two-phase refrigerant-induced noise of the capillary tube in an evaporator-inlet pipe has been a great concern. The capillary tube is usually covered with insulation-foam packed in the space between inner and outer cabinets without any vibration isolation. Therefore, the refrigerant-induced vibration of the capillary tube can be easily transferred to the outer cabinet, which may increase the radiated noise. In this paper, the characteristics of transferred vibration through the insulation-foam are investigated experimentally by using the refrigerantsupplying equipment. The frequency characteristics, such as dynamic Young's modulus and loss factor, of the insulation-foam are also discussed.

과냉도에 따른 모세관 입구단에서의 냉매 상태 변화가 냉장고 냉매 소음에 미치는 영향의 실험적 분석 (Experimental Analysis of the Effect of Phase Change at the Entrance of a Capillary Tube by Sub-cooling Control on Refrigerant-induced Noise)

  • 오영후;김민성;한형석;김태훈;정의봉
    • 한국소음진동공학회논문집
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    • 제22권12호
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    • pp.1184-1190
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    • 2012
  • This study is focused on the experimental analysis of the noise induced by phase change of refrigerant at the entrance of capillary tube. The refrigerant is usually two-phase condition when it flowed into the capillary tube. At the entrance of capillary tube, the phase condition of refrigerant is formed by sub-cool control. If it has sufficient sub-cool temperature, all of the vapor refrigerants turned to liquid, which means there is only liquid. Otherwise, the gas is coexisted. Based on this theory, we experiment on each case by changing sub-cool temperature using refrigerant-supplying equipment. The noise level is measured for each case and compared.

압축기 흡입배관 압력 맥동 특성의 실험 및 해석 (Analysis and Experiment of Pressure Pulsation in a Suction Pipe of Compressor)

  • 오한음;정의봉;안세진;김민성
    • 한국소음진동공학회논문집
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    • 제24권10호
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    • pp.756-762
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    • 2014
  • This paper dealt with numerical estimation of the pressure pulsation of the refrigerant in a suction pipe of the compressor. The behavior of the pressure pulsation was assumed to satisfy the wave equation. The boundary conditions and properties of refrigerant are necessary as input data of the simulation. The pulsating pressures at 15 points in a pipe were measured simultaneously from the pressure transducers. From the experimental data, the complex phase speed and impedance at the end of the pipe of the refrigerant were estimated using the signal processing and used as the input conditions of the numerical analysis. A commercial acoustic software was used to solve the behavior of pressure pulsation. The numerical results for the pressure pulsation in a pipe with and without expansion chamber were carried out and compared with those by experiments. Finally, numerical procedure to estimate the pressure pulsation in a pipe was established and verified.