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Experimental evaluation of a water based high temperature heat pump with novel high pressure lift turbo compressors

Abstract

This paper evaluates a water based (R718) high temperature heat pump with novel high-pressure lift turbo
compressors. The first stage turbo compressor is designed for steam compression and the second stage is
designed for air, both are based on economic standard components from the automotive industry. A 500 kW
compressor test rig was built by SINTEF to test the 2-stage configuration in superheated steam conditions.
Compressor efficiency and system COP was calculated based on measurements from the test rig. Also,
compressor maps for the two compressors was created. For the 1st stage compressor, the maximum isentropic
efficiency was 67% and maximum pressure ratio 2.4. The second stage yielded 77% and 2.0. The two-stage
configuration was able to produce 4.23 bar steam, from atmospheric inlet conditions. The system COP
corresponded to 4.5 and a Carnot efficiency of 49.5 %.
Keywords: Heat pumps, HTHP, Water R718, turbo compressor, energy efficiency, steam production
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Category

Academic chapter

Language

English

Author(s)

  • Espen Halvorsen Verpe
  • Christian Schlemminger
  • Michael Bantle
  • Marcel Ulrich Ahrens

Affiliation

  • SINTEF Energy Research / Termisk energi
  • Norwegian University of Science and Technology

Year

2020

Publisher

International Institute of Refrigeration

Book

Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants - GL2020

ISBN

9782362150401

Page(s)

49 - 54

View this publication at Norwegian Research Information Repository