Patent ID: 7048035

Claim:
A casing for a heat exchange system comprising: a top surface ( 12 ) and a bottom surface ( 14 ); a peripheral wall ( 16 ) extending between said surfaces ( 12 , 14 ) and about a periphery of said surfaces ( 12 , 14 ) with said peripheral wall ( 16 ) defining a cylindrical blower compartment ( 18 ), an evaporator compartment ( 20 ), and a diffuser ( 22 ) extending between said compartments ( 18 , 20 ) for facilitating air flow from said blower compartment ( 18 ) to said evaporator compartment ( 20 ); said diffuser ( 22 ) defining an entry area in a cutoff plane ( 30 ) at an entry to said diffuser ( 22 ) from said cylindrical blower compartment ( 18 ) with said cutoff plane ( 30 ) being transverse to said diffuser ( 22 ) and an exit ( 28 ) for establishing a direction of air flow into said evaporator compartment ( 20 ), and said peripheral wall ( 16 ) further extending from said exit ( 28 ) to define a vane wall ( 38 ) of said evaporator compartment ( 20 ); said vane wall ( 38 ) curving inwardly from said exit ( 28 ) of said diffuser ( 22 ) into said evaporator compartment ( 20 ) for redirecting air flow exiting said diffuser ( 22 ); a plurality of parallel vanes ( 46 , 48 , 50 , 52 ) disposed in spaced relationship along and substantially transverse to the direction of said vane wall ( 38 ) with said plurality of vanes ( 46 , 48 , 50 , 52 ) including a first vane ( 46 ) proximal said diffuser ( 22 ) and a second vane ( 48 ) spaced from said first vane ( 46 ) on the opposite side thereof downstream from said exit ( 28 ) of said diffuser ( 22 ) for redirecting the airflow across said evaporator compartment ( 20 ); and said first vane being positioned from said cutoff plane ( 30 ) at a distance (L 1 ) of not greater than 1.9 times the square root of said entry area divided by the value of pi.