TY - JOUR
T1 - Centrifugal turbo chiller using water as refrigerant and lubricant
AU - Shoyama, Tadayoshi
AU - Kawano, Bunki
AU - Ogata, Takeshi
AU - Matsui, Masaru
AU - Furukawa, Masato
AU - Dousti, Saeid
N1 - Funding Information:
We thank Maruwa Electronic Inc. for their assistance with the manufacturing of the turbo compressor.
Publisher Copyright:
© IMechE 2020.
PY - 2022/2
Y1 - 2022/2
N2 - Water refrigerant heat pump system with a water vapour turbo compressor is developed. Water (R718) is an ideal refrigerant that is considered perfectly environment friendly. Although water refrigerant heat pump is studied extensively, the development of turbo compressors of high pressure ratio is still a technical challenge, in terms of both aerodynamics of the impellers and high-speed rotordynamics. In this study, the high-speed rotor is supported by journal bearings lubricated with water refrigerant. Additionally, other system components such as sprayed direct intercooler heat exchanger and anti-cavitation flow control valve have to be designed and developed with the new requirements as well. An experimental test rig of closed-loop heat pump is constructed which achieves the cooling capacity of 100 kW on the rated condition with COP = 5. The experimental results and the experienced challenges and their undertaken solutions are discussed in terms of the efficiency and the vibrations of the turbo compressor and the heat pump system.
AB - Water refrigerant heat pump system with a water vapour turbo compressor is developed. Water (R718) is an ideal refrigerant that is considered perfectly environment friendly. Although water refrigerant heat pump is studied extensively, the development of turbo compressors of high pressure ratio is still a technical challenge, in terms of both aerodynamics of the impellers and high-speed rotordynamics. In this study, the high-speed rotor is supported by journal bearings lubricated with water refrigerant. Additionally, other system components such as sprayed direct intercooler heat exchanger and anti-cavitation flow control valve have to be designed and developed with the new requirements as well. An experimental test rig of closed-loop heat pump is constructed which achieves the cooling capacity of 100 kW on the rated condition with COP = 5. The experimental results and the experienced challenges and their undertaken solutions are discussed in terms of the efficiency and the vibrations of the turbo compressor and the heat pump system.
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U2 - 10.1177/0954408920938197
DO - 10.1177/0954408920938197
M3 - Article
AN - SCOPUS:85087417734
SN - 0954-4089
VL - 236
SP - 71
EP - 78
JO - Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
JF - Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering
IS - 1
ER -