• Title/Summary/Keyword: Compressor efficiency

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Performance Evaluation of a Crank-driven Compressor and Linear Compressor for a Household Refrigerator

  • Park, Minchan;Jung, Yoongho;Lee, Jaeyeol;Lee, Jaekeun;Ahn, Youngchull
    • Journal of Power System Engineering
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    • v.21 no.5
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    • pp.5-12
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    • 2017
  • With the difficulties in increasing the efficiency of conventional crank-driven compressors due to mechanical loss, compressor manufacturers have investigated new kinds of compressor such as a free piston compressor mechanism. This study investigates the energy efficiency of two different types of compressor for a household refrigerator. One is the conventional crank-driven compressor, and the other one is a linear compressor. The energy efficiencies of these compressors are evaluated. Experimental results show that the linear compressor has 10% lower power consumption than the brushless direct-current (BLDC) reciprocating compressor. The linear compressor demonstrates excellent energy efficiency by reducing the friction loss. Furthermore, a motor efficiency exceeding 90% is achieved by using a linear oscillating mechanism with a moving magnet. Additionally, the compressor stroke to piston diameter ratio of the oscillating piston in the linear compressor can be adjusted in order to modulate the cooling capacity of the compressor for improved system efficiency.

A STUDY ON THE VOLUMETRIC EFFICIENCY OF HIGH SPEED MULTI-CYLINDER AND ROTARY COMPRESSOR (고속다기통 및 회전식 압축기의 체적효율)

  • OH Hoo Kyu;CHO Kweoun Ok
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.12 no.1
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    • pp.13-18
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    • 1979
  • Volumetric efficiency is a determining factor for tile measurement of compessor capacity, but it is practically hard to take an accurate measurement of capacity characteritics so that most of users trust the data of makers catalogue. We often realized the discrepancy in their data with actual capacity. This study was attemped to establish the basic data of capacity characteristics of compressor by measuring volumetric efficiency of high speed multi-cylinder compressor and rotary compressor. The volumetric efficiency was calculated based on the quantity of the flow of ammonia vapor and pressure difference in suction state of orifice plate and compressor. The volumetric efficiency of high speed multi-cylinder compressor was $37-61\%$ and that of rotary compressor was $57-82\%$ when compression ratio was in the range of 4-12. The discrepancy in volumetric efficiency at an equal evaporating temperature between the makers catalogue and the measured data was $5.5\%$.

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Study of the Flow in Centrifugal Compressor

  • Xu, Cheng;Amano, Ryoichi Samuel
    • International Journal of Fluid Machinery and Systems
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    • v.3 no.3
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    • pp.260-270
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    • 2010
  • Reducing the losses of the tip clearance flow is one of the keys in an unshrouded centrifugal compressor design and development because tip clearances are large in relation to the span of the blades and also centrifugal compressors produce a sufficiently large pressure rise in single stage. This problem is more acute for a low flow high-pressure ratio impeller design. The large tip clearance would cause flow separations, and as a result it would drop both the efficiency and surge margin. Thus a design of a high efficiency and wide operation range low flow coefficient centrifugal compressor is a great challenge. This paper describes a recent development of high efficiency and wide surge margin low flow coefficient centrifugal compressor. A viscous turbomachinery optimal design method developed by the authors for axial flow machine was further extended and used in the centrifugal compressor design. The compressor has three main parts: impeller, a low solidity diffuser and volute. The tip clearance is under a special consideration in this design to allow impeller insensitiveness to the clearance. A patented three-dimensional low solidity diffuser design method is used and applied to this design. The compressor test results demonstrated to be successful to extend the low solidity diffusers to high-pressure ratio compressor. The compressor stage performance showed the total to static efficiency of the compressor being about 85% and stability range over 35%. The test results are in good agreement with the design.

A Study on Efficiency Enhancement in a Reciprocating Compressor for a Domestic Refrigerator (소형 냉장고용 왕복동식 압축기의 효율향상에 관한 연구)

  • Sim Yun-Hee;Youn Young;Park Youn Cheol
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.17 no.5
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    • pp.418-426
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    • 2005
  • Efficiency of the compressor is most important parameter in the domestic refrigerator which runs year around. With developed analytical model about heat transfer analysis in the hermetic compressor, parametric study was performed to know the effect on efficiency by design and material modification of the compressor. Volumetric efficiency of the compressor increased approximately $3\%$ when insulation is increased about $50\%$ in suction component. However, the insulation effect on discharge component was only $1\%$. When the thermal conductivity of the discharge plenum is reduced from 300 to 20 $W/m{\cdot}K$, volumetric efficiency increased about $3.1\%$. There is no attraction in efficiency increment with variation of outside surface area of the compressor and radial heat transfer coefficient of the solid component in the compressor shell.

A Study on the Evaluation of Energy Consumption of the Air Compressor (공기압축기 소비에너지 평가에 관한 연구)

  • Jang, Ji Seong
    • Journal of Drive and Control
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    • v.17 no.2
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    • pp.38-44
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    • 2020
  • Various efforts have been initiated to reduce the energy consumption of the compressor as it is one of the approaches to saving a large portion of the fixed cost of the production site. Various results of reducing the energy consumption of the compressor have been reported, but to reduce the energy consumption of the compressors fundamentally, regular management of the compressor should ensure optimum operation. This requires periodic on-site visits by experts, but is often overlooked as a cost issue, resulting in the use of the compressor in low-efficiency conditions. Thus, it is necessary to develop a low-cost evaluation technology for compressor condition monitoring and efficiency analysis to ensure that the compressor is always driven at the optimum efficiency without imposing undue burden on the compressor user. In this study, a sensor was installed at the inlet, outlet, and power supply of the compressor, and a method for evaluating the energy consumption of the compressor using the minimum sensor was derived. The experimental results are presented to show the validity of the proposed method. It was confirmed that the energy consumption of the compressor can be easily as well as efficiently evaluated by using the method developed in this study.

The effect on the seasonal performance of an inverter compressor with higher and lower operating range (인버터 압축기의 저속과 고속운전범위가 계절성능에 미치는 영향)

  • 박윤철;하도용;민만기
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.2
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    • pp.173-179
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    • 1998
  • An experimental study was conducted on the effect of compressor capacity control range of heat pump on the seasonal energy efficiency ratio with variation of the maximum and minimum compressor input frequencies. To obtain seasonal energy efficiency ratio, steady state test at the maximum, minimum and intermediate compressor speed and cyclic test at the minimum compressor speed should be conducted. Maximum input frequency was varied to 95Hz, 105Hz, and 115Hz, and the minimum input frequency was varied to 35Hz, 45Hz, and 55Hz. The seasonal energy efficiency ratio increased as the input frequency of the compressor decreased. The maximum input frequency had only slight effects on the SEER.

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Analytical Study on the Performance of a Rotary Vane Compressor (로타리 베인 공기압축기의 성능에 관한 수치해석)

  • Kim Hyun-Jin;Nam Bo-Young;Lee Gyeong-Yong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.18 no.4
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    • pp.351-358
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    • 2006
  • This paper presents analytical results of a rotary vane compressor performance when the compressor is used for air supply from underwater. Compression characteristics such as pressure and temperature in a compression chamber are analyzed. Volumetric and adiabatic efficiencies are calculated. Vane dynamics are also performed to give reaction forces on the vane from the cylinder inner surface and from vane slots. Compressor efficiency is about 34.9%, and about 55% of the compressor loss is produced by the friction between the vane nose and the cylinder wall. Volumetric efficiency is about 79.5%, and indicated efficiency is about 77.1%, which are comparable to other displacement type compressors. When roller was introduced between housing inner wall and vane tips, mechanical efficiency could be improved by as much as 24.9%, depending on the roller friction.

Performance Analysis of Swash Plate Type Compressor on the Inclined Angle of Swash Plate (사판의 경사각도 변화에 따른 사판식 압축기의 성능해석)

  • Lee, Geon Ho
    • 유체기계공업학회:학술대회논문집
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    • 2002.12a
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    • pp.215-220
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    • 2002
  • This paper describes a simulation model for estimation the performance of the swash plate type compressor for automotive air conditioning system. The model includes consideration of both the compression process and the dynamic behavior. Also, this study compares the results obtained from the performance simulation with experimental results. Further, the effects of the inclined angle of swash plate on the performance of swash plate type compressor are discussed.

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Improvement of Compressor-Cooling Efficiency Based on Ribs (리브를 활용한 압축기 냉각 효율 향상에 관한 연구)

  • Hwang, Il Sun;Lee, Young Lim
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.6
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    • pp.70-75
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    • 2021
  • Recently, several efforts have been made to improve the thermal efficiency of a refrigerant compressor. In this study, we attempted to improve energy efficiency ratio (EER) performance by reducing the superheat of the linear compressor. To this end, heat generated inside the compressor must be effectively dissipated. Therefore, heat dissipation was improved by processing ribs in the gap-flow region generated owing to the vibration of the compressor body. The results showed that the convective heat transfer coefficient becomes significantly high when ribs are used, increasing the heat dissipation rate. This helps improve EER by reducing the superheat of the compressor.

Analysis and Efficiency Control of Linear Compressor System for Refrigerator Driven by PWM Inverter (PWM인버터로 구동되는 냉장고용 선형압축기시스템의 특성해석 및 효율제어)

  • Son, Jang-Kyung;Chun, Tae-Won
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.11
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    • pp.1544-1549
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    • 2013
  • Recently, the linear compressors with the free piston driven by the linear motor have widely attention in the cooling apparatus such as a refrigerator due to high efficiency. The method of using triacs as a linear motor drive is not satisfactory to improve the efficiency of the linear compressor. In this paper, the performance of the linear compressor using a PWM inverter such as the efficiency is investigated with the variations of both mechanical resonant frequency and electrical resonant frequency. The control loop for controlling both the piston stroke and efficiency is suggested. Through simulation and experimental studies, the performance of both the stroke and angle controls for improving the efficiency of the linear compressor is verified.