Control of vapor compression cycles of refrigeration systems
AssigneeThe University of Melbourne
InventorIan D. Roberts
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Abstract
A vapor compression cycle refrigeration system of the type having the expansion valve (11) controlled by a temperature sensing bulb (12) at the downstream end of the evaporator (5). A by-pass line (15) is provided from the expansion valve outlet to the evaporator (5) to inject wet vapor upstream from the temperature sensing bulb (12) and provide proportioned negative feedback to the expansion valve (11) to reduce hunting or oscillating of the system. Variations of the by-pass line are also described to give positive feedback and combinations giving integral and derivative action.
Claims10
A refrigeration system including an evaporator controlled by an expansion valve having means for sensing the temperature or vapour dryness at the downstream end of the evaporator, characterized by means for injecting wet vapour at a rate which is a function of the rate of flow of refrigerant through the expansion valve into said evaporator upstream of said temperature sensing means.
Dependencies are inferred from the claim text.