Canadian Patents Database / Patent 2744858 Summary

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(12) Patent: (11) CA 2744858
(54) English Title: CO2 REFRIGERATION SYSTEM
(54) French Title: SYSTEME FRIGORIFIQUE PAR CO2
(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)
(74) Agent: NORTON ROSE FULBRIGHT CANADA LLP/S.E.N.C.R.L., S.R.L.
(45) Issued: 2013-01-08
(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

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 de réfrigération CO2 comprend un circuit de réfrigération dans lequel circule un réfrigérant CO2 entre un étage de compression dans lequel le réfrigérant CO2 est comprimé. Un étage de condensation est prévu dans lequel le réfrigérant CO2 dégage de la chaleur et est accumulé dans un réservoir de condensation. Un étage d'évaporation est prévu dans lequel le réfrigérant CO2 est détendu à l'état gazeux pour absorber la chaleur d'un fluide à refroidir, avec au moins une partie du réfrigérant CO2 sortant de l'étage d'évaporation étant dirigée vers un circuit supra-compression comprenant un étage de supra-compression dans lequel la partie de réfrigérant CO2 est comprimée. Un échangeur de chaleur est fourni par l'intermédiaire duquel le réfrigérant comprimé CO2 est dans une relation d'échange thermique avec un circuit de réfrigération secondaire, de telle sorte que le réfrigérant CO2 comprimé dégage de la chaleur à un réfrigérant secondaire utilisé pour le chauffage. Des moyens de régulation de pression commandent la pression du réfrigérant CO2 comprimé étant renvoyé à l'étage de condensation.


Note: Claims are shown in the official language in which they were submitted.



CLAIMS:

1. A CO2 refrigeration system comprising a
refrigeration circuit in which circulates CO2
refrigerant between a supra-compression stage in which
the CO2 refrigerant is supra-compressed, a condensation
reservoir in which a portion of the CO2 refrigerant is
accumulated in a liquid state, and an evaporation stage
in which the CO2 refrigerant absorbs heat from a fluid
for refrigeration, with at least a portion of CO2
refrigerant exiting the evaporation stage being directed
to the supra-compression stage, at least one of (1) a
heat exchanger by which the compressed CO2 refrigerant
releases heat for heating purposes and (2) a gas cooling
unit in which the compressed CO2 refrigerant releases
heat, with the at least one of the heat exchanger and
the gas cooling unit being positioned between the supra-
compression stage and the condensation reservoir, and a
pressure-regulating unit to control a pressure of the
compressed CO2 refrigerant being directed to the
condensation reservoir.

2. The CO2 refrigeration system according to
claim 1, further comprising an other compression stage
receiving a portion of the CO2 refrigerant from the
evaporation stage.

3. The CO2 refrigeration system according to
claim 2, further comprising a first suction accumulator
evaporators of the evaporation stage and a suction of
the other compression stage, to separate liquid and
gaseous portions from the CO2 refrigerant such that
gaseous CO2 refrigerant is fed to the other compression
stage.


-26-



4. The CO2 refrigeration system according any one
of claims 2 and 3, further comprising a second suction
accumulator between a discharge of the other compression
stage and a suction of the supra-compression stage, to
separate liquid and gaseous portions from the CO2
refrigerant such that gaseous CO2 refrigerant is fed to
the supra-compression stage.

5. The CO2 refrigeration system according to
claim 4, wherein the second suction accumulator receives
a portion of the CO2 refrigerant exiting the evaporation
stage to then feed said portion of the CO2 refrigerant
to the supra-compression stage.

6. The CO2 refrigeration system according to
claim 5, further comprising an other suction accumulator
upstream of the compression stage to separate liquid and
gaseous portions from the CO2 refrigerant such that
gaseous CO2 refrigerant is fed to the compression stage.
7. The CO2 refrigeration system according to
claim 6, wherein the other suction accumulator receives
an other portion of the CO2 refrigerant exiting the
evaporation stage to then feed said other portion of the
CO2 refrigerant to the compression stage.

8. The CO2 refrigeration system according to any
one of claims 6 and 7, further comprising a return line
between the suction accumulators to direct liquid CO2
refrigerant to the suction accumulator upstream of the
compression stage.

9. The CO2 refrigeration system according to
claim 3, further comprising a heat-exchanger line
collecting liquid CO2 refrigerant and oil in the first
suction accumulator and vaporizing the CO2 refrigerant

-27-



to a gaseous state, to then direct the CO2 refrigerant
and oil in the gaseous state to the other compression
stage.

10. The CO2 refrigeration system according to
claim 9, wherein the heat-exchanger line is in heat
exchange with a discharge line of the other compression
stage.

11. The CO2 refrigeration system according to any
one of claims 4 to 8, further comprising a gaseous line
extending from the condensation reservoir to the second
suction accumulator to direct gaseous CO2 refrigerant
from the condensation reservoir to the second suction
accumulator.

12. The CO2 refrigeration system according to
claim 11, further comprising heat-exchanger means in the
gaseous line for the gaseous CO2 refrigerant to cool
liquid CO2 refrigerant fed to the evaporation stage.

13. The CO2 refrigeration system according to any
one of claims 1 to 12, further comprising an independent
refrigerant circuit in heat-exchange relation with a
discharge of the compression stage to cool the CO2
refrigerant subsequently reaching the condensation
reservoir.

14. The CO2 refrigeration system according to any
one of claims 1 to 13, wherein the supra-compression
stage compresses the CO2 refrigerant to a transcritical
state.

15. The CO2 refrigeration system according to any
one of claims 1 to 14, comprising a plurality of the
heat exchangers, with control means to control an amount

-28-



of compressed CO2 refrigerant directed to the heat
exchangers.

16. The CO2 refrigeration system according to any
one of claims 1 to 14, comprising a plurality of the
heat exchangers, with means to control a ventilation of
air on each of the heat exchangers as a function of a
heat demand.

17. The CO2 refrigeration system according to any
one of claims 1 to 16, further comprising a bypass line
extending from the supra-compression stage and the
pressure-regulating unit to bypass at least one of the
heat exchanger and the gas cooling unit.

18. The CO2 refrigeration system according to any
one of claims 1 to 17, wherein the pressure-regulating
unit is at least one valve that is controlled to
increase pressure upstream of the valve in order to
increase an amount of heat reclaimed.


-29-


A single figure which represents the drawing illustrating the invention.

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Admin Status

Title Date
(22) Filed 2009-10-23
(41) Open to Public Inspection 2010-04-29
Examination Requested 2011-06-22
(45) Issued 2013-01-08

Maintenance Fee

Description Date Amount
Last Payment 2017-10-04 $200.00
Next Payment if small entity fee 2018-10-23 $100.00
Next Payment if standard fee 2018-10-23 $200.00

Note : If the full payment has not been received on or before the date indicated, a further fee may be required which may be one of the following

  • the reinstatement fee set out in Item 7 of Schedule II of the Patent Rules;
  • the late payment fee set out in Item 22.1 of Schedule II of the Patent Rules; or
  • the additional fee for late payment set out in Items 31 and 32 of Schedule II of the Patent Rules.

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $800.00 2011-06-22
Filing $400.00 2011-06-22
Maintenance Fee - Application - New Act 2 2011-10-24 $100.00 2011-06-22
Maintenance Fee - Application - New Act 3 2012-10-23 $100.00 2012-08-13
Final $300.00 2012-10-23
Maintenance Fee - Patent - New Act 4 2013-10-23 $100.00 2013-10-22
Maintenance Fee - Patent - New Act 5 2014-10-23 $200.00 2014-07-30
Maintenance Fee - Patent - New Act 6 2015-10-23 $200.00 2015-07-28
Maintenance Fee - Patent - New Act 7 2016-10-24 $200.00 2016-10-05
Maintenance Fee - Patent - New Act 8 2017-10-23 $200.00 2017-10-04

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Description 2011-06-22 25 1,127
Abstract 2011-06-22 1 28
Claims 2011-06-22 5 174
Drawings 2011-06-22 13 253
Representative Drawing 2011-09-02 1 15
Cover Page 2011-09-02 2 53
Cover Page 2012-12-27 2 54
Abstract 2012-03-12 1 31
Claims 2012-03-12 4 157
Correspondence 2011-07-20 1 39
Prosecution-Amendment 2012-01-20 1 19
Prosecution-Amendment 2012-02-27 2 69
Prosecution-Amendment 2012-03-12 7 277
Correspondence 2012-10-23 2 65