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US 9,994,751 B2Granted
Absorption refrigeration cycles using a LGWP refrigerant
AssigneeHoneywell International Inc.
InventorsRyan J. Hulse, Rajiv Ratna Singh
Life of this patent
Estimating the term…
Abstract
An absorptive refrigeration method that employs a refrigerant comprising one or more hydrofluoroolefin or hydrochlorofluoroolefin refrigerants, and an oil selected from the group consisting of a polyalkyene glycol oil, a poly alpha olefin oil, a mineral oil and a polyolester oil.
Claims12
A method for providing absorption refrigeration, comprising:
- a. evaporating in an evaporator a first liquid-phase refrigerant comprising a refrigerant comprising at least one of 1,3,3,3-tetrafluoropropene and 1-chloro-3,3,3-trifluoropropene to produce a low-pressure vapor-phase refrigerant stream, wherein said evaporating transfers heat from a system to be cooled;
- b. contacting in an absorber said low-pressure vapor-phase refrigerant stream with a first low-pressure liquid-phase solvent under conditions effective to dissolve all of said low-pressure vapor phase refrigerant stream in said first low-pressure solvent to produce a low pressure liquid-phase refrigerant-solvent solution, wherein the first solvent stream comprises a polyalkylene glycol oil and/or a polyolester oil and wherein said low-pressure refrigerant stream is introduced at a concentration not greater than the saturation point of said low-pressure solvent stream;
- c. increasing the pressure and temperature of said low pressure liquid-phase refrigerant-solvent solution to produce a high pressure liquid-phase refrigerant-solvent solution stream;
- d. thermodynamically separating said high pressure liquid-phase refrigerant-solvent solution stream into a high-pressure vapor-phase refrigerant stream and a second liquid-phase solvent stream;
- e. reducing the pressure of at least a portion of said second liquid-phase solvent stream and using said reduced pressure second liquid-phase solvent to produce said first liquid-phase solvent for step (b);
- f. condensing said high-pressure vapor-phase refrigerant stream to produce a second liquid phase refrigerant stream;
- and
- g. reducing the pressure of at least a portion of said second liquid-phase refrigerant stream and using said reduced pressure second liquid-phase solvent stream to produce said first liquid-phase refrigerant stream for step (a).
5 more elements
An absorption refrigeration system comprising:
- a. a refrigerant comprising 1,3,3,3-tetrafluoropropene;
- b. a solvent comprising a polyalkylene glycol oil and/or a polyolester;
- c. an evaporator suitable for evaporating said refrigerant;
- d. a mixer suitable for mixing said refrigerant with said solvent, wherein said mixer is fluidly connected to said evaporator;
- e. an absorber suitable for dissolving at least a portion of said refrigerant into said solvent to produce a solution, wherein said absorber is fluidly connect to said mixer;
- f. a pump fluidly connected to said absorber;
- g. a heat exchanger fluidly connected to said pump;
- h. a separator suitable for thermodynamically separating said solution into a vapor refrigerant component and a liquid solvent component, wherein said separator is fluidly connected to said heat exchanger;
- i. an oil return line fluidly connected to said separator and said mixer, and
- j. a condenser suitable for condensing said vapor refrigerant component, wherein said condenser is fluidly connected to said separator and said evaporator.
7 more elements
An absorption refrigeration system comprising:
- a. a refrigerant comprising 1,3,3,3-tetrafluoropropene;
- b. a solvent comprising a polyalkylene glycol oil and/or a polyolester;
- c. an evaporator suitable for evaporating said refrigerant;
- d. a condenser suitable for condensing said refrigerant;
- e. a separator suitable for thermodynamically separating a solution comprising said refrigerant dissolved in said solvent into a vapor refrigerant component and a liquid solvent component;
- and
- f. at least one gas-dissolving subsystem comprising a mixer suitable for mixing said refrigerant with said solvent, an absorber suitable for dissolving at least a portion of said refrigerant into said solvent to produce a solution, a pump, and a heat exchanger, wherein said mixer is fluidly connected to said absorber, said absorber is fluidly connected to said pump, and said pump is fluidly connected to said heat exchanger;
- wherein said gas-dissolving subsystem is in fluid communication with said at least two units selected from the group consisting of said evaporator, said separator, and another gas-dissolving subsystem, provided that at least one subsystem is in fluid communication with said evaporator and at least one subsystem is in fluid communication with said separator.
5 more elements
Dependencies are inferred from the claim text.