Hvac with back-pressure limiting expansion device
AssigneeCarrier Corporation
InventorRemus Vintila
Life of this patent
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Abstract
A fluid conditioning system includes a compressor, a first heat exchanger, a second heat exchanger, and a first expansion device, and a second expansion device fluidly connected to form a closed loop through which a working fluid circulates. The first expansion device is associated with operation of the fluid conditioning system in a first mode and the second expansion device is associated with operation of the fluid conditioning system in a second mode. The second expansion device is a thermostatic expansion device. An accumulator is fluidly connected to the closed loop upstream from the compressor relative to a flow of the working fluid. A back pressure regulator is fluidly coupled to the first heat exchanger, the second heat exchanger, and the second expansion device.
Claims19
A fluid conditioning system comprising:
- a compressor, a first heat exchanger, a second heat exchanger, and a first expansion device, and a second expansion device fluidly connected to form a closed loop through which a working fluid circulates, wherein the first expansion device is associated with operation of the fluid conditioning system in a first mode, and the second expansion device is associated with operation of the fluid conditioning system in a second mode, the second expansion device being a thermostatic expansion device;
- an accumulator fluidly connected to the closed loop upstream from the compressor relative to a flow of the working fluid;
- and
- a back pressure regulator fluidly coupled to the first heat exchanger and the second heat exchanger, second expansion device.
A method of operating a fluid conditioning system, comprising:
- providing a closed loop circuit including a compressor, a first heat exchanger, a first expansion device, a second expansion device, and a second heat exchanger, wherein the second expansion device is a thermostatic expansion device;
- operating the fluid conditioning system in a first mode;
- during the first mode, circulating a working fluid through the compressor, the first heat exchanger, the first expansion device, and the second heat exchanger of the closed loop circuit in a first direction;
- operating the fluid conditioning system in a second mode;
- and
- during the second mode, circulating the working fluid through the compressor, the second heat exchanger, the second expansion device, and the first heat exchanger of the closed loop circuit in a second direction, the closed loop including a back pressure regulator arranged in parallel with the second expansion device and circulating the working fluid through the closed loop circuit during the second mode includes dividing the working fluid into a first portion provided to the second expansion device and a second portion provided to the back pressure regulator.
Dependencies are inferred from the claim text.