Using a novel 3-port condensing wave rotor enhancing the turbo-compression in a R718 refrigeration cycle, which uses only water as a refrigerant, has been introduced. The wave-rotor implementation can increase efficiency and reduce size and cost of R718 units. The condensing wave rotor employs pressurized water to pressurize, desuperheat, and condense the refrigerant vapor — all in one dynamic process. The underlying phenomena of flash evaporation, shock wave compression, desuperheating, and condensation inside the wave rotor channels are described in a wave and phase-change diagram. The thermodynamic process is shown in pressure-enthalpy and temperature-entropy diagrams. A computer program based on a thermodynamic model was generated to evaluate the performance of R718 baseline and wave-rotor-enhanced cycles. The effect of some key parameters on the performance enhancement is demonstrated as an aid for optimization. A performance map summarizes the findings. It shows optimum wave rotor pressure ratio and maximum relative performance improvement of R718 cycles by using the 3-port condensing wave rotor.
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ASME Turbo Expo 2004: Power for Land, Sea, and Air
June 14–17, 2004
Vienna, Austria
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4172-3
PROCEEDINGS PAPER
Preliminary Study of a Novel R718 Turbo-Compression Cycle Using a 3-Port Condensing Wave Rotor
Amir A. Kharazi,
Amir A. Kharazi
Michigan State University, East Lansing, MI
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Pezhman Akbari,
Pezhman Akbari
Michigan State University, East Lansing, MI
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Norbert Mu¨ller
Norbert Mu¨ller
Michigan State University, East Lansing, MI
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Amir A. Kharazi
Michigan State University, East Lansing, MI
Pezhman Akbari
Michigan State University, East Lansing, MI
Norbert Mu¨ller
Michigan State University, East Lansing, MI
Paper No:
GT2004-53622, pp. 381-388; 8 pages
Published Online:
November 24, 2008
Citation
Kharazi, AA, Akbari, P, & Mu¨ller, N. "Preliminary Study of a Novel R718 Turbo-Compression Cycle Using a 3-Port Condensing Wave Rotor." Proceedings of the ASME Turbo Expo 2004: Power for Land, Sea, and Air. Volume 7: Turbo Expo 2004. Vienna, Austria. June 14–17, 2004. pp. 381-388. ASME. https://doi.org/10.1115/GT2004-53622
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