Abstract
In a liquid injection heat pump, it is very essential to control the compressor discharge temperature without wet-compression problems at extreme outdoor conditions. The objective of this study was to optimize the injection-hole geometries of a liquid injection heat pump in order to prevent the risk of wet-compression while reducing compressor discharge temperature at overload cooling conditions. In this study, a simulation model for predicting the performance of a liquid injection heat pump was developed and validated. The optimum injection-hole geometries were determined to obtain the maximum multiplication ratio, which led to a lower instant injection mass flow rate in terms of R- and θ-directional positions. In addition, the injection-hole diameter was minimized to prevent wet-compression while obtaining the target injection mass flow rate. The discharge temperature of the optimized compressor was decreased by 9.2 °C over the baseline compressor while maintaining the same risk for wet-compression at the overload cooling test condition.
Original language | English |
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Pages (from-to) | 1178-1188 |
Number of pages | 11 |
Journal | Applied Thermal Engineering |
Volume | 113 |
DOIs | |
Publication status | Published - 2017 Feb 25 |
Bibliographical note
Publisher Copyright:© 2016 Elsevier Ltd
Keywords
- COP
- Liquid injection
- Refrigeration cycle
- Rotary compressor
- Simulation
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Industrial and Manufacturing Engineering