• Title/Summary/Keyword: Refrigerant Compressor

검색결과 352건 처리시간 0.521초

The Influence of the Vane on the Lubrication Characteristics Between the Vane and the Rolling Piston of a Rotary Compressor

  • Cho, Ihn-Sung;Jung, Jae-Youn
    • Journal of Mechanical Science and Technology
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    • 제20권12호
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    • pp.2242-2249
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    • 2006
  • The rolling piston type rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of refrigerant compressors. The study of lubrication characteristics in the critical sliding component is essential for the design of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor being used for refrigeration and air-conditioning systems was investigated. The Newton-Raphson method was used for a partial elastohydrodynamic lubrication analysis between the vane and the rolling piston of a rotary compressor. The results demonstrated that the vane thickness and the center line position of the vane significantly influenced the friction force and the energy loss between the vane and the rolling piston.

Lubrication Characteristics Between the Vane and the Rolling Piston in a Rotary Compressor Used for Refrigeration and Air-Conditioning Systems

  • Jung, Jae-Youn;Oh, Seok-Hyung;Cho, Ihn-Sung
    • Journal of Mechanical Science and Technology
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    • 제15권5호
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    • pp.562-568
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    • 2001
  • The rolling piston type-rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness and high-speed operation. The present analysis is part of a research program directed toward maximizing the advantages of refrigerant compressors. The study of lubrication characteristics in critical sliding components is essential for the design of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor used for refrigeration and air-conditioning systems was studied. The Newton-Raphson method was used for the partial elastohydrodynamic lubrication analysis between the vane and the rolling piston of a rotary compressor. The results showed that the rotational speed of a shaft and the discharge pressure significantly influence the friction force and the energy loss between the vane and the rolling piston.

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자동차 냉매 압축기의 FSI(Fluid-Structure Interaction) 해석 (FLUID STRUCTURE INTERACTION ANALYSIS OF AUTOMOTIVE REFRIGERANT COMPRESSOR)

  • 손일국;배성민;김광일;윤영섭
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2010년 춘계학술대회논문집
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    • pp.93-98
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    • 2010
  • One of the most effective key factors to improve performance of automotive reciprocating compressor is the design of suction and discharge reed valves. Reed valves are also the major sources of compressor noise. Valve motion is highly coupled with refrigerant flow. In this study, a process of fluid-structure interaction analysis was developed to predict the cylinder inner flow and the dynamic behavior of valve simultaneously. Interface programs computational structural dynamics code. The full cycle simulations of compressor were performed using FSI analysis was alidated by comparing the simulation results with the experimental results.

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The Lubrication Characteristics of a Rotary Compressor Used for Refrigeration and Air-conditioning Systems (Part III; Analysis of partial elastohydrodynamic lubrication on vane tip)

  • 조인성;오석형;정재연
    • Tribology and Lubricants
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    • 제17권2호
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    • pp.138-145
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    • 2001
  • The rolling piston type rotary compressor has been widely used for refrigeration and air-conditioning systems due to its compactness and high-speed operation. The present analysis is a part of research program directed toward maximizing these advantages of refrigerant compressors. The study of lubrication characteristics in the critical sliding component is essential for the design of refrigerant compressors. Therefore, theoretical investigation of the lubrication characteristics of a rotary compressor used for refrigeration and air-conditioning systems is studied. Newton-Raphson method is used for the partial elastohydrodynamic lubrication analysis between vane and rolling piston in the rotary compressor. The results show that the rotational speed of a shaft and the discharge pressure influence significantly the friction force and the energy loss between vane and rolling piston.

CO2 압축기의 운전조건과 오일토출의 상관분석에 관한 실험적 연구 (An Experimental Study on Correlation between Oil Discharge and Various Operating Conditions of a CO2 Compressor)

  • 이익수;강병하
    • 설비공학논문집
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    • 제23권1호
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    • pp.73-79
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    • 2011
  • A portion of oil for lubrication of compressor flows together with refrigerant in the refrigeration system. If the oil discharge from a compressor is increased in the refrigeration system, not only pressure drop is increased in other components, such as evaporator and gas cooler, but also heat transfer coefficient in the heat exchangers is decreased. Oil discharge rate from a compressor may strongly depend on operating conditions of a compressor. In this study, one stage single rotary compressor is employed for measuring oil circulation ratio(OCR). Carbon dioxide and PAG oil are used as refrigerant and lubricant. Using a U-tube densimeter, mixture density is measured. Oil circulation ratio(OCR) can be estimated by measured mixture density. The results obtained indicate that the oil circulation ratio(OCR) is increased as the suction temperature or compressor operating frequency is increased. Oil circulation ratio(OCR) correlation of the compressor is also suggested.

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.

대체냉매 공기조화기용 로터리 압축기의 성능향상을 위한 최적 토출계에 관한 실험적 연구 (An Experimental Study on the High Performance Optimal Discharge System of a Rotary Compressor for an Air Conditioner using alternative Refrigerant R410a)

  • 윤영;정진택;민만기
    • 설비공학논문집
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    • 제13권2호
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    • pp.96-105
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    • 2001
  • R410a which is one of HFC refrigerants is being considered to be a promising replacement for R22 widely used in domestic air conditioners. The rolling piston type rotary compressors for R410a have lower energy efficiency than those for R22 because of the high pressure difference between a suction chamber and a discharge chamber in the compression mechanism. in addition, the re-expansion gas loss of the rotary compressor for R410a which occurs a ta clearance volume in a discharge port becomes larger than that for R22 due to high density of R410a refrigerant. Therefore, Pressure-Volume analyses for various design parameters of a discharge system were carried out to improve efficiency of a R410a rotary compressor. The results such as performance dta, over-compression loss, and re-expansion loss were acquired by P-V analyses and analyzed quantitatively. As a conclusion, the optimal specifications of several design parameters of a discharge system were obtained by analyzing P-V diagrams.

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열펌프의 성능 최적화에 관한 연구 (Optimization of Heat Pump Systems)

  • 최종민;윤린;김용찬
    • 신재생에너지
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    • 제3권4호
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    • pp.22-30
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    • 2007
  • An expansion device plays an important role in optimizing the heat pumps by controlling refrigerant flow and balancing the system pressures. Conventional expansion devices are being gradually replaced with electronic expansion valves due to increasing focus on comfort, energy conservation, and application of a variable speed compressor. In addition, the amount of refrigerant charge in a heat pump is another primary parameter influencing system performance. In this study, the flow characteristics of the expansion devices are analyzed, and the effects of refrigerant charge amount on the performance of the heat pump and the variation of compressor speed are investigated at various operating conditions. Mass flow rate through capillary tube, short tube orifice, and EEV was strongly dependent on the upstream pressure and subcooling. The heat pump system is very sensitive with a variation of refrigerant charge amount. The performance of it can be optimized by adjusting the flow rate through expansion device to maintain a constant superheat at all test conditions.

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제습 사이클에서의 냉매-오일 혼합물의 유동특성 (Flow Characteristics of Refrigerant-oil Mixtures in a Dehumidifying Cycle)

  • 박세민;하삼철;신종민;이장호
    • 설비공학논문집
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    • 제13권1호
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    • pp.1-8
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    • 2001
  • This paper deals with refrigerant-oil mixtures in a dehumidifying cycle. Two different oils such as Alkylbenzene(AB) and Polyol-esters(POE) lubricants are used for R134a to investigate the effect of miscibility on oil returnability. It was found that R134a/AB mixture had more unstable interface between oil and refrigerant than R134a/POE mixture. However, overall flow patterns of both refrigerant-oil mixtures were almost same. The minimum height of oil measured in the compressor was as high as twice of the least permissible height of oil in the compressor required to insure its reliability. Thus, it is considered that immiscible oil, i. e., AB for R134a can be used without causing oil returnability problem.

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가변속 열펌프의 냉매 유량제어에 의한 난방성능 변화에 관한 실험적 연구 (An Experimental Investigation on the Variation of Heating Performance Due to the Refrigerant Flow Control in a Variable-Speed Heat Pump)

  • 김봉훈
    • 설비공학논문집
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    • 제13권8호
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    • pp.746-756
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    • 2001
  • An experimental study was conducted to investigated the effect of refrigerant flow control on the performance of a variable-speed heat pump operating in both cooling and heating mode. For this purpose, cooling and heating capacity, EER and refrigerant mass flow rate corresponding to an electronic valve as well as a capillary tube were measured as functions of compressor speed, length of capillary tube (or valve opening of the electronic valve), refrigerant charge, and outdoor temperature. From the comparison of experimental results, it was found that the performance variation due to the electronic valve opening became significant as the operating conditions(outdoor temperature and compressor speed) deviated from the standard condition at which heating capacity and EER were rated for the indicated capillary tube.

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