An air-chiller comprises a primary compressor that circulates a mixture of four refrigerants with different boiling points through a primary condenser and several heat-exchanger coils in series. Each heat exchanger coil includes a large section of tubing in which are disposed four smaller sections
An air-chiller comprises a primary compressor that circulates a mixture of four refrigerants with different boiling points through a primary condenser and several heat-exchanger coils in series. Each heat exchanger coil includes a large section of tubing in which are disposed four smaller sections of tubing. Two of these smaller sections of tubing carry the air to be chilled. The other two smaller sections of tubing carry high pressure refrigerants from the compressor and condenser. The remaining inside volume of the large section of tubing provides for the suction-return of heat-laden refrigerants. Input air passes through the four heat exchangers in series and comes out the fourth one highly refrigerated. The high-pressure refrigerant coming out of the primary compressor is chilled below ambient temperature by a secondary refrigeration sub-system. Such is circulated, after drying, through an auxiliary condenser for additional refrigeration before going to work in the first heat-exchanger coil. The secondary refrigeration sub-system further includes a small compressor that circulates a single HP80 refrigerant through the auxiliary condenser.
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The invention claimed is: 1. A method for providing increased chilled airflows for the cooling of a semiconductor device under test, while maintaining or improving the air-coolant exhaust temperatures, comprising: cooling an auxiliary condenser by a secondary single stage refrigeration system that
The invention claimed is: 1. A method for providing increased chilled airflows for the cooling of a semiconductor device under test, while maintaining or improving the air-coolant exhaust temperatures, comprising: cooling an auxiliary condenser by a secondary single stage refrigeration system that contains a condenser that shares the cooling fan of the primary condenser for the mixed refrigerant refrigeration system; pre-chilling a high pressure flow of a mixture of refrigerants exiting a primary condenser from above an ambient air temperature to a temperature substantially below said ambient air temperature; and then using said refrigerated high pressure flow of said mixture of refrigerants to chill an input air in a series of heat-exchanger coils. 2. The method of claim 1, wherein the step of refrigerating further comprises: configuring an auxiliary condenser to share fan air with said primary condenser; circulating a single refrigerant through said auxiliary condenser with an auxiliary compressor. 3. The method of claim 1, further comprises: recovering a chill waste and recirculating it through said primary condenser to improve otherwise over using ambient temperature air. 4. An air-chiller system, comprising: an open airflow circuit having a compressed air input and a chilled-air output; a primary mixed-refrigerant circuit of a plurality of refrigerants with different boiling points; a primary compressor and a primary condensor included in the primary mixed-refrigerant circuit; a series of heat exchangers through which the open airflow circuit passes through from a first to a last heat exchanger, and through which the mixed-refrigerant circuit passes through from said first to said last heat exchanger, and then returns from said last to said first heat exchanger, wherein heat is removed from the open airflow circuit, and wherein each constituent refrigerant material operates with a corresponding single heat exchanger; and an auxiliary refrigerant circuit that includes an auxiliary heat-exchanger, an auxiliary compressor and an auxiliary condenser, and connected to provide chilling only to the refrigerants in the primary mixed-refrigerant circuit; wherein, the primary mixed-refrigerant circuit passes through the primary condenser, and then is pre-chilled by the auxiliary heat-exchanger to below the ambient temperature of the primary condenser, at a point just before entering the series of heat exchangers that chill the open airflow circuit. 5. The air-chiller system of claim 4, wherein the mixed-refrigerant circuit includes a mixture of refrigerants with different boiling points in an empirically derived balance of R14 (CF) tetrafluromethane; R23 (CHF) trifluromethane; R123 (CHCI CF), 2,2-dichloro-1, 1,1-trifluoroethane; and, R124 (CHCIFCF), 1-chloro-1,2,2,2-tetrafluoroethane. 6. The air-chiller system of claim 4, wherein the auxiliary condenser shares fan air with the primary condenser. 7. An improved method of air-chilling, comprising: a primary refrigeration system with a high pressure flow of mixed-refrigerants that leave a primary condenser at temperatures above ambient; characterized by: devoting an auxiliary refrigeration system solely to the pre-chilling said high pressure flow of mixed-refrigerants leaving said compressor to a lower than said ambient temperatures before passing them to a plurality of heat exchangers in series used only in the cooling of a compressed air flow; and including constituent refrigerant materials in said mixed-refrigerants each with different physical characteristics that selectively operate with a corresponding single heat exchanger in said plurality of heat exchangers in series; wherein, air flow volumes and chilling through said heat exchangers are improved. 8. The method of claim 7, wherein improvements to said air flow volumes and chilling through said series of heat exchangers of the primary refrigeration system are better than 20-CFM and-90° C.
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이 특허에 인용된 특허 (5)
Narreau Peter P. (Pennellville NY), Economizer control with variable capacity.
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