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Multiparametric analysis of novel multilevel temperature heat pumps (LEAP) for multi-sink heating.

Number: 0485

Author(s) : BADRAN E. B., YEBIYO M., STIGNOR C. H., AXELL M., GUSTAFSSAN O., WILLIS M.

Summary

Industrial sectors are currently seeking ways to decarbonize their processes which rely primarily on fossil fuel boilers. Heat pumps offer high-quality heating that could substitute boilers due to their high coefficient of performance (COP) for moderate temperature lifts. It is proven that the heat pump efficiency deteriorates with increased temperature lifts. This paper examines multilevel heat pumps (LEAP) as an efficient way to produce high and/or variable-level sink temperatures. The LEAP concept operates between 0°C and 160°C with three heating levels at 60°C, 110°C, and 160°C. With a two and three-stage independent layered heat pump system, the sink heat exchanger is divided into two heat exchangers at each stage. One is used to supply the external load requirements, and the other is to cover the source or internal load on the higher consecutive stage cycle. The external load heat exchangers can be connected in series or parallel to control the desired load output temperature. A multi-parameter selection analysis was conducted using EES software to evaluate several natural and synthetic refrigerants with low values of the Global Warming Potential (GWP) index. For different scenarios, selected low GWP refrigerants were investigated based on their thermophysical properties. The multiparametric analysis shows that for each stage a COP of 3.5 was achieved and a total COP of 2.5 can be obtained for the LEAP concept. This is equivalent to an increase of about 40 % more than a single heat pump can provide. The best synthetic refrigerants were R-1234ze (Z), R-1224yd (Z), R-1233zd (E), and R1366mzz (Z). On the other hand, the best natural refrigerants were R-600 (n-Butane), R-600a (Isobutane), R-601 (n-Pentane), and R-601a (Isopentane).

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  • Original title: Multiparametric analysis of novel multilevel temperature heat pumps (LEAP) for multi-sink heating.
  • Record ID : 30033244
  • Languages: English
  • Source: 14th IEA Heat Pump Conference 2023, Chicago, Illinois.
  • Publication date: 2023/05

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