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Patent Summary

(12) Patent: (11) CA 2744840


English Abstract

A CO2 refrigeration system comprises a refrigeration circuit in which circulates CO2 refrigerant between a compression stage in which the CO2 refrigerant is compressed. A condensation stage is provided in which the CO2 refrigerant releases heat and is accumulated in a condensation reservoir. An evaporation stage is provided in which the CO2 refrigerant is expanded to a gaseous state to absorb heat from a fluid for refrigeration, with at least a portion of CO2 refrigerant exiting the evaporation stage being directed to a supra-compression circuit comprising a supra-compression stage in which the portion of CO2 refrigerant is compressed. A heat exchanger is provided by which the compressed CO2 refrigerant is in a heat-exchange relation with a secondary-refrigerant circuit, such that the compressed CO2 refrigerant releases heat to a secondary refrigerant used for heating purposes. Pressure-regulating means control a pressure of the compressed CO2 refrigerant being returned to the condensation stage.

French Abstract

Un système frigorifique par CO2 comprenant un circuit de réfrigération où circule du réfrigérant au CO2 après un étage de compression dans lequel le réfrigérant au CO2 est comprimé. Un étage de condensation est utilisé, dans lequel le réfrigérant au CO2 dégage la chaleur et est accumulé dans un réservoir de condensation. Un étage d'évaporation est utilisé, dans lequel le réfrigérant au CO2 est dilaté en un état gazeux pour absorber de la chaleur d'un fluide pour la réfrigération, au moins une partie du réfrigérant au CO2 sortant de l'étage d'évaporation étant dirigé vers un circuit de surcompression comprenant un étage de surcompression dans lequel la partie de réfrigérant au CO2 est comprimée. Un échangeur de chaleur est utilisé, par lequel le réfrigérant au CO2 comprimé est dans une relation d'échange de chaleur avec un circuit de réfrigérant secondaire, de sorte que le réfrigérant au CO2 comprimé dégage de la chaleur vers un réfrigérant secondaire utilisé à des fins de chauffage. Des moyens de régulation de pression commandent la pression du réfrigérant au CO2 comprimé étant retourné vers l'étage de condensation.

Patent Details

(51) International Patent Classification (IPC):
  • F25B 9/00 (2006.01)
(72) Inventors (Country):
  • DUBE, SERGE (Canada)
(73) Owners (Country):
  • DUBE, SERGE (Canada)
(71) Applicants (Country):
  • DUBE, SERGE (Canada)
(45) Issued: 2014-01-28
(22) Filed Date: 2009-10-23
(41) Open to Public Inspection: 2010-04-29
Examination requested: 2011-06-22
(30) Availability of licence: N/A
(30) Language of filing: English

(30) Application Priority Data:
Application No. Country Date
61/107,689 United States of America 2008-10-23
61/166,884 United States of America 2009-04-06
61/184,021 United States of America 2009-06-04

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View Patent Image Download Patent Image in PDF Format Size of Image (KB) Number of Pages
Cover Page Cover Page 53 2
Abstract Abstract 29 1
Claims Claims 148 4
Description Description 1,109 25
Drawings Drawings 258 13
Representative Drawing Representative Drawing 15 1

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