Air cycle air conditioning systems
AssigneeNormalair-Garret (Holdings) Limited
InventorsGeorge R. Giles, Donald Richards
Life of this patent
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Abstract
An air cycle air conditioning system has an air expansion turbine arranged to deliver air through an outlet formed by a wall having an outer surface that defines in part passage means through which supply air flows to the turbine. Heat flow from the supply air into the wall prevents formation of ice in the outlet so that in at least one phase of system operation the turbine delivers air at sub-zero temperature with which large quantities of augmenting air can be mixed so as to increase the system cooling capacity.
Claims21
An air cycle air conditioning system including, in combination,
- an air system inlet for connection with a supply of pressurized air,
- an air system outlet for connection with a region to which conditioned air is to be delivered,
- an air expansion turbine connected between the system inlet and the system outlet,
- said turbine including an inlet, turbine nozzles, a turbine wheel, and a turbine outlet whereby air passing through the inlet and turbine nozzles is directed onto the turbine wheel to deliver expanded air to the turbine outlet,
- passage means connecting the system inlet and said turbine inlet,
- said passage means including a wall disposed in said turbine, said wall having an inner surface defining at least a part of said turbine outlet, said wall having an outer surface defining at least a part of the conduit connection between said system inlet and said turbine inlet,
- whereby in operation of the air conditioning system the outer surface of said wall provides for a primary heat transfer from supply air flowing from the system inlet to said turbine inlet to prevent icing on the inner surface of said wall due to passage of conditioned air through the turbine outlet.
An air cycle air conditioning system including, an air inlet for said system and an air outlet for said system, an air expansion turbine in conduit connection with said system inlet and said system outlet, said turbine including a turbine inlet and turbine outlet, passage means connecting said system inlet to said turbine inlet, said passage means including a wall defining at least a part of said turbine outlet, the outer surface of said wall providing a primary heat transfer surface from the air supplied to the turbine, a heat exchanger conduitly connected in series with the passage means upstream of the turbine inlet, a multi-way valve being in fluid communication with, at least, the outlet of the heat exchanger and the passage means.
Dependencies are inferred from the claim text.