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Air conditioning system having controllably coupled thermal storage capability
| Details |
Inventors: Honigsbaum, Richard F.;
Assignee:
Primary Examiner: Braun; Leslie
Assistant Examiner:
Attorney, Agent or Firm: Hubbell, Cohen, Stiefel & Gross
An improved air conditioning system comprises a first medium in heat exchange relation with an air stream, means for controlling the temperature of the first medium to effect sufficient heat exchange to control the temperature of the air stream, a second medium having thermal storage capacity, thermal conducting means interposed between said first and second media for effecting heat exchange therebetween, the thermal conducting means being thermally coupled to a means for exchanging heat with the air stream, and a means for controlling the flow rate of the air stream through the heat exchange means in order to controllably apportion heat exchange between (a) the first medium and (b) the air stream and the second medium. The system also includes, as additions to the conventional sensors and controls, means for sensing the level of thermal storage effected by the second medium and providing an output signal indicative thereof, cycling means for activating the temperature control means in response to these sensing means output signals, and, for vehicular applications, means for sensing and cycling on the basis of vehicle operating mode. |
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DETAILED DESCRIPTION According to the present invention I have developed an air conditioning systems having thermal storage capability which employs a single evaporator but is nevertheless capable of providing substantially instantaneous cooling during occasional use.
According to a preferred embodiment of the invention, a coil containing a thermal storage medium is thermally coupled to a conventional evaporator coil.
Preferably, coupling is accomplished by a plurality of fins which engage the juxtaposed turns of the two coils.
The preferred system also includes an adjustable speed fan which blows the air stream to be cooled between the fins and the coils.
Thus the fins serve the dual role of coupling the coils and exchanging heat with the air stream.
The adjustable speed fan also serves to control the effective thermal coupling between the conventional evaporator coil and the thermal storage coil.
This effect occurs between the rate at which heat is removed from the air stream is, amongst other things a function of the air stream velocity which is, in this embodiment, a function of fan speed, and during periods of high fan speed heat removal from the air will be favored.
However, during periods of low fan speed comparatively less heat will be removed from the air stream, thereby favoring increased heat transfer between the evaporator coil and the thermal storage coil via the interconnecting fins.
During periods when instantaneous cooling is desired, which generally occur when the air conditioning system is initially activated, fan speeds will normally be high, thus favoring increased heat removal from the air.
During periods when cooling demand is below system capacity, fan speeds will be low and cooling from the coil will serve to cool the thermal storage medium.
Once sufficient thermal storage is effected, the compressor can be stopped and the air cooled by transferring heat to the thermal storage medium.
During such periods no additional engine fuel is required to drive the compressor, and the net result is one of substantial fuel savings because the compressor is either operating at full capacity or is stopped, and much, if not all, of the fuel used to operate a conventional system in the throttling mode described earlier is saved
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