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Experimental investigation on a turbo expander substituted for throttle valve in the subcritical refrigeration system

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  • Zhang, Zhenying
  • Li, Minxia
  • Ma, Yitai
  • Gong, Xiufeng

Abstract

Owing to the large volumetric expansion ratio of the subcritical refrigerant and the geometrical restriction of the positive displacement machine, investigations on expanders in subcritical vapor refrigeration systems are relatively few in the literature. In this paper, a radial inflow turbo expander prototype is developed for expansion power recovery in the subcritical refrigeration system. The experimental results show that the prototype can operate stably within a wide speed range of up to 3200 rpm. A maximum of 10.4% isentropic efficiency is obtained when the inlet pressure is 1.7 MPa. It is also found that the optimum velocity ratio of the expander is 0.08–0.14 and shifts to higher values with the increase of the expander inlet pressure. Also, the defects of the prototype are discussed to further improve its performance.

Suggested Citation

  • Zhang, Zhenying & Li, Minxia & Ma, Yitai & Gong, Xiufeng, 2015. "Experimental investigation on a turbo expander substituted for throttle valve in the subcritical refrigeration system," Energy, Elsevier, vol. 79(C), pages 195-202.
    • Handle: RePEc:eee:energy:v:79:y:2015:i:c:p:195-202
    DOI: 10.1016/j.energy.2014.11.007
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    References listed on IDEAS

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    1. Jiang, Yuntao & Ma, Yitai & Fu, Lin & Li, Minxia, 2013. "Some design features of CO2 two-rolling piston expander," Energy, Elsevier, vol. 55(C), pages 916-924.
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    Cited by:

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    2. Gao, Yu & He, Guogeng & Cai, Dehua & Fan, Mingjing, 2020. "Performance evaluation of a modified R290 dual-evaporator refrigeration cycle using two-phase ejector as expansion device," Energy, Elsevier, vol. 212(C).
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    5. Yang, Yu & Chen, Shuangtao & Sheng, Chunchen & Xie, Hongtao & Luo, Gaoqiao & Hou, Yu, 2021. "Study on coupling performance of turbo-cooler in aircraft environmental control system," Energy, Elsevier, vol. 224(C).
    6. Frate, Guido Francesco & Ferrari, Lorenzo & Lensi, Roberto & Desideri, Umberto, 2019. "Steam expander as a throttling valve replacement in industrial plants: A techno-economic feasibility analysis," Applied Energy, Elsevier, vol. 238(C), pages 11-21.
    7. Kumar, Manoj & Behera, Suraj K. & Kumar, Amitesh & Sahoo, Ranjit K., 2019. "Numerical and experimental investigation to visualize the fluid flow and thermal characteristics of a cryogenic turboexpander," Energy, Elsevier, vol. 189(C).
    8. Mehrpooya, Mehdi & Moftakhari Sharifzadeh, Mohammad Mehdi & Rosen, Marc A., 2015. "Optimum design and exergy analysis of a novel cryogenic air separation process with LNG (liquefied natural gas) cold energy utilization," Energy, Elsevier, vol. 90(P2), pages 2047-2069.

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