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US 2024/0392178 A1Published application
Nonflammable refrigerants having low gwp, and systems for and methods of providing refrigeration
AssigneeHoneywell International Inc.
InventorsNilesh Purohit, Kaimi Gao, Ankit Sethi, Ryan Hulse
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Abstract
The present invention provides cascade refrigeration systems in which the low stage consists essentially of R454A and the high stage comprises a refrigerant that is either Class A1 or Class A2L and comprises at least about 75% by weight of HFO-1234ze(E).
Claims8
A cascade refrigeration system, comprising:
- a. a low stage refrigeration circuit comprising:
- a low stage refrigerant consisting essentially of R454A;
- and
- a compressor;
- b. an inter-circuit heat exchanger in which said low stage refrigerant condenses;
- and
- c. a high stage refrigeration circuit comprising a high stage refrigerant which:
- (i) has either Class A1 or Class A2L flammability;
- (ii) evaporates at a temperature below said low stage refrigerant condensing temperature;
- and (iii) comprises at least about 77% by weight of HFO-1234ze (E), wherein said high stage refrigerant evaporates in said inter-circuit heat exchanger by absorbing heat from said refrigerant in said low stage refrigeration circuit.
7 more elements
Dependencies are inferred from the claim text.