Patent
Electronic expansion valve control for a refrigerant cooled variable frequency drive (VFD)
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TLDR
In this article, a control system for a refrigerant cooled variable frequency drive (VFD) for a chiller includes a controller which controls an electronic expansion valve to attempt to maintain a heat sink for the VFD within its design operating range.Abstract:
A control system for a refrigerant cooled variable frequency drive (VFD) for a chiller includes a controller which controls an electronic expansion valve to attempt to maintain a heat sink for the variable frequency drive within its design operating range. When the controller is unable to maintain the heat sink within its design operating range, a load on the chiller is reduced, either by reducing the frequency of the variable frequency drive, or if the chiller includes a compressor with internal guide vanes, by partially closing the guide vanes. The power rating of the VFD can thus be optimized based on its heat generating components operating at a controlled condition, unlike an air-cooled device which is dependent on the ambient environment.read more
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Patent
High capacity chiller compressor
Mark C Doty,Earl A. Campaigne,Thomas A. Watson,Paul K Butler,Quentin E Cline,S Samuel J Showalter +5 more
TL;DR: In this paper, a variable frequency drive (VFD) was used to drive a permanent magnet motor and match compressor speed with compressor load, a direct drive impeller that eliminated gearing losses, and magnetic bearings that reduce frictional losses.
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References
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Patent
Air conditioning systems
TL;DR: In this article, an air conditioning system includes a refrigerant circuit, which includes an expansion valve for reducing a pressure of the condensed liquid refrigerant, and an evaporator for evaporating the condensed fluid refrigerant.
Patent
Apparatus for cooling the power electronis of a refrigeration compressor drive
TL;DR: In this article, the power electronics components of a variable frequency drive for the motor of a refrigerant system compressor are mounted upon a heat sink and refrigerant from the system condenser is passed through the heat sink by means of a flow line.
Patent
Variable speed drive chiller system
TL;DR: In this paper, the variable speed drive is cooled by refrigerant from the refrigeration system, which permits the use of a smaller drive, and a variable speed driver is operated at, or approaching, a unity power factor.
Patent
Cooling of air conditioning control electronics
Robert W. Helt,George N. Sawyer +1 more
TL;DR: In this article, a residential heat pump installation includes a variable speed reciprocating compressor, which is cooled by diverting the refrigerant liquid line into the closed controls compartment of the outdoor cabinet section and passing the liquid line through a block of material therein upon which the compressor speed control components are mounted.
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Apparatus for cooling an air conditioning system electrical controller
TL;DR: In this article, an apparatus for cooling a vehicle air conditioning system electrical controller (20) includes a chill block (10) in juxtaposition to the controller, which forms a cooling groove in heat exchange relation with the controller.