F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
F25B 30/02 (2006.01) F24F 1/02 (2006.01)
Patent
CA 2143881
The invention described herein pertains to an air cycle heat pump contained in a single and compact unit which is capable to perform the functions of a heat pump, a de-humidifier, and an air exchanger with energy recovery capability. The unit consists basically of two superimposed rectangular compartments. Two air circuits, one for the upper or condensing compartment, the other for the lower or evaporating compartment utilize their individual fan, and through an arrangement of air valves either of the circuits can communicate with the outdoors, the indoors or exclusively the indoors depending on the particular mode being asked for. The outstanding feature of this unit is an especially designed evaporator. The latter consist of evaporator slabs arranged in a zig-zag pattern on a circular base which can be rotated with respect to the air stream supplied by the evaporator fan. Rotated into one position, the slabs will present a surface area to the air stream which is the sum total of all the slabs combined, while in the other position all the slabs are presenting a parallel arrangement so that the entire air stream will flow consecutively through each slab. The former case is principally required when the unit is in a heating mode to reduce frost accumulation on the evaporator fins, while the latter case exhibits its main advantage during the de-humidifying mode when the air should be cooled down to maximum for greatest extraction of moisture. Placing the evaporator into any intermediate position will allow it to handle a variety of air conditions in either the cooling or de- humidifying modes. The unit would typically be installed in a basement and would be connected to the outdoors via two ducts, the latter supplying outdoor air when the heating, cooling or fresh air exchange modes are called for. These ducts are capable of being closed off by a pair of shut-off valves integrated into the upper compartment, the latter being placed in the closed position when the unit is not in use or the de-humidifying or de-frost modes are in demand. Alternatively the unit could also be installed outdoors with only two ducts required to connect to the indoors ducting system.
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