This paper presents a new analytical model of surge dynamics in turbo heat pumps. Turbo heat pumps use refrigerants as the working fluid and consist of a centrifugal compressor, condenser, expansion valve, and evaporator. Compared with a gas turbine engine, the turbo heat pump system introduces additional complexities. First, the turbo heat pump forms a closed-loop system. Second, the system has two plenums, condenser and evaporator, which are coupled to each other. Third, the heat pump runs on a refrigeration cycle with two phases: vapor and liquid. Fourth, heat transfer effects of evaporation and condensation have to be considered. Fifth, unlike air, a refrigerant has strong real gas effects and thus cannot be modeled as an ideal gas. The new model addresses such additional complexities on the basis of the first principles of conservation of mass, momentum, and energy. When applied to a gas turbine system, the new model’s predictions become identical to those from the Greitzer’s model. Furthermore, comparison with the available experimental data shows that the model can also accurately predict surge behavior in actual turbo heat pumps. Finally, the effects of Greitzer’s parameter and the ratio of evaporator and condenser volume have been examined. Parameter influences both surge shape and frequency. Finally, surge frequency is extremely sensitive to the ratio of the two plenum volumes.
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e-mail: hrimkim@snu.ac.kr
e-mail: sjsong@snu.ac.kr
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October 2011
Research Papers
Modeling of Surge Characteristics in Turbo Heat Pumps
Hye Rim Kim,
Hye Rim Kim
Mechanical and Aerospace Engineering,
e-mail: hrimkim@snu.ac.kr
Seoul National University
, Seoul 151-744, Korea
Search for other works by this author on:
Seung Jin Song
Seung Jin Song
Mechanical and Aerospace Engineering,
e-mail: sjsong@snu.ac.kr
Seoul National University
, Seoul 151-744, Korea
Search for other works by this author on:
Hye Rim Kim
Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-744, Koreae-mail: hrimkim@snu.ac.kr
Seung Jin Song
Mechanical and Aerospace Engineering,
Seoul National University
, Seoul 151-744, Koreae-mail: sjsong@snu.ac.kr
J. Turbomach. Oct 2011, 133(4): 041015 (9 pages)
Published Online: April 21, 2011
Article history
Received:
July 2, 2010
Revised:
July 11, 2010
Online:
April 21, 2011
Published:
April 21, 2011
Citation
Kim, H. R., and Song, S. J. (April 21, 2011). "Modeling of Surge Characteristics in Turbo Heat Pumps." ASME. J. Turbomach. October 2011; 133(4): 041015. https://doi.org/10.1115/1.4002993
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