Journal
ENERGY
Volume 190, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2019.116427
Keywords
Water refrigerant; High temperature heat pump; System COP; Water injection
Categories
Funding
- National Natural Science Foundation of China [51706131]
- National Key R&D Program of China [2016YFB0601200]
- Research Council of Norway
- HighEFF(Centre for an Energy Efficient and Competitive Industry for the Future, an 8-year Research Centre under the FMEscheme)
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Vapor compression very high temperature heat pumps (VHTHPs) with low-GWP refrigerants have attracted enormous attention for waste heat recovery. To yield high temperature output, a water vapor twin-screw compressor with water-injection is developed and a VHTHP prototype is established to conduct the experimental investigation. The experimental results show that when condensation temperature increases from 111 degrees C to 150 degrees C, the COP of this VHTHP decreases from 6.10 to 1.96 at the evaporation temperature of 85 degrees C. The highest COP is about 6.10 with the heating capacity of 285 kW at 85 degrees C evaporation and 117 degrees C condensation temperature, respectively. The highest condensation temperature of this water vapor VHTHP can reach 150 degrees C with the COP of 1.96. At the same temperature lift, the COP increases with the output temperature increasing. That means this VHTHP is more suitable for higher output temperature with the same temperature lift. So this VHTHP can be used to supply pressured hot water or high temperature steam when the user is favorable. Considering the characteristic of high-efficiency and environment-friendly, this VHTHP is highly desirable and competitive. (C) 2019 Elsevier Ltd. All rights reserved.
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