Patent
Heat pump refrigerant charge control system
TLDR
In this paper, a microcomputer controlled charge control system for modulating charge in a heat pump refrigerant circuit is presented, where super-heating and sub-cooling strategies are employed to maintain the charge level in the circuit at optimum performance levels, automatically adapting to changes in environmental load conditions on the heat pump heat exchange coils.Abstract:
A microcomputer controlled charge control system for modulating charge in a heat pump refrigerant circuit. A charge receiver has its interior in thermal communication with the compressor suction line and has a single charge flow line connected via a charge control valve to the refrigerant circuit at a point intermediate two controllable expansion valves in the high side of the circuit. Super-heating and subcooling strategies are employed to maintain the charge level in the circuit at optimum performance levels, automatically adapting to changes in environmental load conditions on the heat pump heat exchange coils. Additional control strategy is employed to shift refrigerant charge into and out of the circuit during transient operation, such as during start-up, stop and reversal into defrost, to optimize operating efficiency during these transient conditions and also to assure correct placement of the refrigerant charge, for example, to avoid compressor slugging during start-up following an off cycle or a reversal in refrigerant flow.read more
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Patent
Refrigeration system subcooling control
TL;DR: In this paper, a control system for a refrigeration system having an air-cooled condenser exposed to normal year-round ambient temperatures is described, in which head pressure is controlled in response to sensed subcooling of the refrigerant in the liquid line near the entrance to the expansion device, so as to prevent the occurrence of flash gas at the expansion devices, while still allowing minimum head pressures so that to improve energy efficiency.
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Means and method for modulating and controlling the capacity of a vapor compression cycle device
TL;DR: In this article, the inventory of mixture stored in a device high-pressure accumulator through the controlled regulation of the accumulator pressure is adjusted to adjust working fluid mixture composition directly effecting the capacity of an associated vapor compression cycle device.