US 2026/0243445 A1Published application

Advanced heat pump with improved performance and control

AssigneeDaikin Comfort Technologies Manufacturing, L.P.

InventorsMichael F. Taras, Auston Green, Murilo Almeida

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Abstract

HVAC systems may be used in residential, commercial, industrial, and other applications. More specifically, the HVAC systems allow a refrigerant flow to be routed thought a refrigerant circuit to utilize an outdoor heat exchanger, an indoor heat exchanger, and a reheat coil in one or more cooling modes, a heating mode, and a hot gas reheat (“HGRH”) mode. The HVAC systems may also use the refrigerant circuit to aid in rerouting the refrigerant flow through the outdoor heat exchanger, the indoor heat exchanger, and the reheat coil to enhance system performance characteristics in all three modes. Additionally, the HVAC systems may use various flow valves or control devices to control a direction of the refrigerant flow through the refrigerant circuit.

Claims20

Dependent claims

A heating, ventilation, and air conditioning (HVAC) system operable to use a refrigerant to heat, cool, and/or dehumidify an indoor space and comprising:

a compressor operable to compress the refrigerant;
an outdoor heat exchanger configured to exchange thermal energy between the refrigerant and an outdoor environment;
an indoor heat exchanger configured to exchange thermal energy between the refrigerant and the indoor space;
a reheat coil positioned in line with an airflow passing across the indoor heat exchanger and configured to exchange thermal energy between the refrigerant and the indoor space;
and
wherein in a cooling mode, the refrigerant flows from the compressor through the outdoor heat exchanger to the indoor heat exchanger and the reheat coil before being directed back to the compressor,
wherein in a heating mode, the refrigerant flows from the compressor through the reheat coil and the indoor heat exchanger and then to the outdoor heat exchanger before being directed back to the compressor, and
wherein in a hot gas reheat (HGRH) mode, at least a portion of the refrigerant flows from the compressor through the outdoor heat exchanger to the indoor heat exchanger before being directed back to the compressor and at least another portion of the refrigerant flows from the compressor through the reheat coil to the outdoor heat exchanger and then to the indoor heat exchanger before being directed back to the compressor such that the airflow flowing across the indoor heat exchanger is cooled and dehumidified and then reheated back while flowing across the reheat coil.

5 more elements

An air conditioner system operable to use a refrigerant to cool and/or dehumidify an indoor space and comprising:

a compressor operable to compress the refrigerant;
an outdoor heat exchanger configured to exchange thermal energy between the refrigerant and an outdoor environment;
an indoor heat exchanger configured to exchange thermal energy between the refrigerant and the indoor space;
a reheat coil positioned in line with an airflow passing across the indoor heat exchanger;
and
a three-way valve operable to flow the refrigerant from the compressor to the outdoor heat exchanger in a first cooling mode, a second cooling mode, and a hot gas reheat (HGRH) mode,
wherein the reheat coil is configured to exchange thermal energy between the refrigerant and the indoor space in the first cooling mode and the HGRH mode,
wherein in the first cooling mode, the refrigerant flows from the compressor through the outdoor heat exchanger to the indoor heat exchanger and to the reheat coil before being directed back to the compressor,
wherein in the second cooling mode, the refrigerant flows from the compressor through the outdoor heat exchanger to the indoor heat exchanger before being directed back to the compressor without flowing through the reheat coil, and
wherein in the HGRH mode, the three-way valve is operable to flow at least a portion of the refrigerant from the compressor to the reheat coil, such that a supply airflow flowing across the indoor heat exchanger is cooled and dehumidified and then reheated back while flowing across the reheat coil to the indoor space.

7 more elements

Dependencies are inferred from the claim text.