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Solar heat recovery system using CO2 as working fluid

Solar heat recovery system using CO2 as working fluid

Category
Academic chapter/article/Conference paper
Abstract
This article proposes a solar water heater system induced by natural convective flow using supercritical CO2 as a
working fluid. The proposed solar water heater can produce thermal energy as hot water from solar thermal energy
without any electric power consumption. In order to investigate the characteristics of the system, the dynamic
characteristics and heat transfer property of the supercritical CO2 flow are measured when the inclination angles of
the solar collector are changed. The current results indicate that the circulation of CO2 flow in this solar heater
system can be easily induced by natural convection even if the solar collector angles are changed from 30° to vertical
against gravity direction. The heat recovery efficiencies of this system are 86.5%, 68.5%, and 58.8% at the collector
inclination angles of 30°, 60°, and 90°, respectively.
Keywords: Carbon Dioxide, Water Heater, Natural Circulation, Solar Radiation, Solar Heat Recovery.
Client
  • Research Council of Norway (RCN) / 257632
Language
English
Author(s)
  • Haruhiko Yamasaki
  • Hiroyuki Wakimoto
  • Hiroshi Yamaguchi
  • Petter Nekså
Affiliation
  • Osaka Prefecture University
  • Doshisha University
  • Norwegian University of Science and Technology
  • SINTEF Energy Research / Gassteknologi
Year
2020
Publisher
International Institute of Refrigeration
Book
Proceedings of the 14th IIR-Gustav Lorentzen Conference on Natural Refrigerants
Issue
14
ISBN
978-2-36215-040-1
Page(s)
375 - 380