• Title/Summary/Keyword: Stirling Refrigerator

Search Result 26, Processing Time 0.023 seconds

New-Type Stirling Engine Employing the Scroll Mechanism (스크롤기구를 적용한 신형식 스털링 엔진)

  • Kim, Y.M.;Shin, D.K.;Lee, J.H.
    • Proceedings of the KSME Conference
    • /
    • 2003.04a
    • /
    • pp.1709-1716
    • /
    • 2003
  • Stirling engine is a heat engine with a high potential efficiency, multi-fuel capability, its low emission, quiet operation, very low maintenance requirement and long life. The Stirling cycle can ideally achieve optimum thermodynamic efficiency of the Carnot cycle. But the actual efficiency of practical reciprocating Stirling engine is much less than that of ideal Stirling cycle due to several mechanical limits. This paper presents a new-type Stirling engine employing the scroll mechanism superior to the reciprocating Stirling engine. The new-type Stirling engine is characterized as traits of continuous and wholly seperated compression and expansion, one-way flow, direct cooling and heating through the extensive surfaces of scroll wraps. By means of this traits, the new-type Stirling engine can achieve thermodynamic cycle closer to the ideal Stirling cycle and have many mechanical merits. Also, the new-type Stirling cycle can be applied as Stirling refrigerator and Duplex Stirling machine.

  • PDF

Study of the performance characteristics of the Stirling type orifice pulse tube refrigerator (스터링헝 오리피스 맥동관 냉동기의 성능특성에 관한 연구)

  • 홍용주;박성제;김효봉;김양훈;최영돈
    • Progress in Superconductivity and Cryogenics
    • /
    • v.4 no.2
    • /
    • pp.63-67
    • /
    • 2002
  • In this study, the performance of the Stirling type orifice Pulse tube refrigerator (OPTR) with a linear compressor was investigated by experiment. The dynamic pressures at three points and a temperature at the cold heat exchanger are measured to explore the dependency of the orifice on the performance of the OPTR. The experimental results show that the opening of the orifice has significant effects on the no load temperature and cool down characteristics. The Pressure amplitude in Pulse tube decrease as the opening of the orifice increase, but the mass flow rate through the orifice and the electric input Power to the compressor increase. The results show that the operating frequency and charging Pressure does not affect on the no load temperature. The pressure amplitude in pulse tube decrease as the operating frequency increase or the charging Pressure decreased.

The effect of the operating frequency and the length of the split tube on the performance for the Stirling cryocooler (작동주파수와 연결관 길이 변화가 스터링 냉동기의 성능에 미치는 영향)

  • 김효봉;박성제;홍용주;고득용;김종학;유병건;박종호
    • Progress in Superconductivity and Cryogenics
    • /
    • v.3 no.2
    • /
    • pp.55-61
    • /
    • 2001
  • A free piston and free displacer (FPFD) Stirling cryocooler for cooling infrared and cryo-sensor is currently under development at korea Institute of Machinery & Materials. The FPFD Stirling cryocooler consists of two compressor pistons driven by linear motors which make pressure waves and a pneumatically driven displacer piston with regenerator. It is the most suitable design for a mechanical cryocooler utilized in night vision environment In this study, performance test of the Stirling cryocooler with different length of the split tube and operating frequency were performed to get characteristics of the cryocooler.

  • PDF

Dynamic Analysis of Linear Oscillatory Actuator for Stirling Refrigerator (스털링 냉동기용 리니어 왕복 액추에이터의 동특성 해석)

  • Jeong, S.S.;Yoon, I.K.;Jang, S.M.;Park, S.J.;Hong, Y.J.
    • Proceedings of the KIEE Conference
    • /
    • 2002.07b
    • /
    • pp.673-675
    • /
    • 2002
  • In this paper. the lumped electrical circuit approach of mass/spring system is used to model the mechanical aspects according to the frequency. Therefore, the mass/spring system can be dealt with here and linked with the equivalent circuit of electric linear oscillatory actuator(LOA). Analysis models are double-coil type linear compressor for stirling refrigerator. The compressor consists of the moving coil LOA, piston, and spring. The electro-mechanical system with mass and spring can be represented using the lumped electrical circuit. We present the system impedance and dynamics of moving coil linear compressor.

  • PDF

Schmidt cycle analysis in the quest of designing stirling cryocooler

  • Chowdhury, Debajyoti Roy;Chakraborty, Nathuram;Sarkar, Swapan Chandra
    • Progress in Superconductivity and Cryogenics
    • /
    • v.19 no.4
    • /
    • pp.12-17
    • /
    • 2017
  • Design of Reverse Stirling Cycle based refrigerator can be predicted by Schmidt theory as a useful tool and by experiment it is found that for practical purposes the power and efficiency predicted by this analysis are about 35% of the actual values. Therefore, appropriate provision is to be made for getting the realistic result with the minimum deviation. The present paper first investigates the suitability of application of Schmidt design analysis for standard ZIF-1002 and PLN-106 Single cylinder Cryogenerator model. As the result is found to be optimistic, the same design procedure is applied for the design of a separate Cryogenerator for generating a cooling effect which is sufficient to produce 7 kg per hour liquid nitrogen using an indigenous condenser of 80% effectiveness. The paper describes all the details of the design methodologies and relevant results are found to be satisfactory.

A Study for Performance Improvements in the Coaxial Type Stirling Pulse Tube Cryocooler (동축형 스털링 맥동관 냉동기의 성능개선에 관한 연구)

  • Park, S.J.;Hong, Y.J.;Kim, H.B.;Kim, Y.H.
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.1329-1334
    • /
    • 2004
  • The most compact and convenient pulse tube cryocooler for practical applications is the coaxial type. It can replace Stirling cryocooler without any change to the Dewar or the connection to the cooled devices. The experimental results of the coaxial inertance tube pulse tube cryocooler for cooling superconductor RF filter are presented in this paper. To find optimal conditions of inertance tube pulse tube cryocooler, no load temperature according to the variations of inertance tube volume, reservoir volume are measured, and the cool down characteristics at the particular conditions are presented. In case of the coaxial type inertance tube pulse tube refrigerator, cool down time is the lowest in the inertance tube diameter of 1.3 mm and inertance tube length of 1900 mm and lowest temperature is 112K. This results are not satisfactory for practical applications. So, We propose vacuum insulation between regenerator and pulse tube in the Stirling type coaxial pulse tube cryocooler. Stirling type coaxial pulse tube cryocooler with the vacuum insulation between regenerator and pulse tube was designed and manufactured by KIMM(Korea Institute of Machinery and Materials). The optimal conditions will be tested for Stirling type coaxial pulse tube cryocooler with the vacuum insulation between regenerator and pulse tube.

  • PDF

Two-dimensional model analysis for the pulse tube of rotating pulse tube refrigerator (회전하는 맥동관 냉동기의 맥동관에 대한 2차원 모델 해석)

  • Chai J.;Jeong S.;Jeong Eun-Soo
    • Progress in Superconductivity and Cryogenics
    • /
    • v.8 no.3
    • /
    • pp.63-69
    • /
    • 2006
  • This paper describes the effect of rotating frequency on the pulse tube of Stirling type pulse tube refrigerator. Various conditions were analyzed by two-dimensional analysis with several dominant non-dimensional parameters. With the additional pressure term influenced by centrifugal force in rotating condition, the linearized conservation equations of mass, momentum, energy of the gas were solved to obtain the first order variables and calculate the enthalpy flow in rectangular coordinates. The rotational effect in pulse tube for the refrigerator's performance were quantitatively evaluated. According to the first order analysis, the enthalpy flow decreases with the rotating speed.

Cryocoolers for cooling of HTS RF Filter and IR detector (초전도필터 및 적외선검지기 냉각용 극저온냉동기)

  • 홍용주
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.11
    • /
    • pp.18-23
    • /
    • 2002
  • 고품질의 극저온 환경의 생성 및 유지는 고품질 대용량 정보통신, 의료진단, 초전도 및 고집적반도체 제조공정 등의 차세대 유망 산업 분야에서 필수적인 요소로 자리 잡고 있으며, cryopump, 민수용 및 군수용의 적외선 검지기 및 초전도 RF 필터의 효과적 냉각을 위해 보다 높은 신뢰성과 수명, 고효율의 극저온 냉동기에 대한 수요는 점차 증대될 것으로 기대된다. 스터링 냉동기 및 맥동관 냉동기는 짧은 역사에도 불구하고, 다양한 분야에서 기존의 한제 및 극저온 냉동기를 대치하여 활용될 수 있을 것으로 전망된다.