Claims
- 1. A very low temperature closed cycle refrigeration system comprising:a mixed refrigerant comprising at least two components with normal boiling points that differ by at least 50 C; a compressor unit with an outlet delivering a refrigerant flow at high pressure and an inlet receiving said refrigerant flow at low pressure: an evaporator receiving said refrigerant flow from said compressor unit at low pressure and low temperature and returning said refrigerant flow to said compressor inlet; a condenser unit receiving said high pressure refrigerant flow from said compressor and removing heat therefrom; a flow metering device between said condenser unit and said evaporator to reduce said high pressure from said compressor to said low pressure in said evaporator and to lower the temperature of said refrigerant flow; heat transfer means for receiving a flow of compressed refrigerant from the compressor, removing heat from the high pressure refrigerant by transferring at least a portion of the heat to a flow of low pressure refrigerant from the evaporator; a control valve receiving said low pressure refrigerant flow from said heat transfer means and outputting said refrigerant flow to said compressor inlet, said control valve maintaining a selected level of said low pressure at an inlet of said control valve and controlling said evaporator pressure.
- 2. A system as in claim 1, wherein said refrigerant is a mixed refrigerant and is composed of the following:Ingredient NameRange (% by weight)Argon or Nitrogen0-20%R-1410-60% At least one of R-23,5-40%or ethaneAt least one of5-30%R-125, or R-143a,or R-32, or R-134a, orR-227ea, or R-218, orR-152aAt least one of0-70%R-236fa, or R-245fa, orR-236ea or R-245ca, orE-347, or R-4112, orR-4310meec.
- 3. Refrigeration system as in claim 1, wherein said refrigerant is a mixed refrigerant and includes by weight 22% of R-14; 9% of R-23; 9% of R-125 and 60% of R-236fa.
Parent Case Info
This application claims the benefit of earlier filed and pending provisional application No. 60/214,565 filed on Jun. 28, 2000.
US Referenced Citations (13)
Provisional Applications (1)
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Number |
Date |
Country |
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60/214565 |
Jun 2000 |
US |