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Natural circulation defrosting with propane in horizontal evaporators of large capacity air-to water heat pump

 
: Oltersdorf, T.; Braungardt, S.; Sonner, C.; Dankwerth, C.; Malenkovic, I.; Miara, M.; Henning, H.M.

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Fulltext urn:nbn:de:0011-n-4674963 (1002 KByte PDF)
MD5 Fingerprint: 726884264d34e44e6b0b88305af18bd2
Created on: 22.6.2019


International Institute of Refrigeration -IIR-:
The 12th IIR Gustav Lorentzen Natural Working Fluids Conference. CD-ROM : 21st-24th August 2016, Heriot Watt University, Edinburgh, UK
Paris: IIR, 2016 (Science et technique du froid. Comptes rendus 2016,4)
ISBN: 978-2-36215-018-0
pp.1126-1133
Gustav Lorentzen Conference on Natural Refrigerants <12, 2016, Edinburgh>
Gustav Lorentzen Natural Working Fluids Conference <12, 2016, Edinburgh>
English
Conference Paper, Electronic Publication
Fraunhofer ISE ()
Gebäudeenergietechnik; Wärme- und Kälteversorgung; Wärme- und Kältetechnik

Abstract
This paper presents natural circulation defrosting for a large capacity horizontally mounted evaporator designed for a propane refrigeration cycle. This defrosting method is based on a two-phase thermosiphon. It is mounted as an additional loop next to a nominal refrigeration circuit to allow switching between the completely different requirements for refrigerant charge either in nominal heat pump operation or in defrosting mode. A fin-and-tube heat exchanger with 5mm round tube with a conventional 32 port nozzle distributor was successfully tested. Considered design criteria, thermal performance and analysis of the defrosting process are presented.

: http://publica.fraunhofer.de/documents/N-467496.html