Patent ID: 11965672
Assignee: DAIKIN APPLIED AMERICAS INC.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A heat pump system comprising:
a compressor, the compressor delivering compressed refrigerant to a discharge line and receiving a refrigerant from a suction line;
an indoor heat exchanger;
an outdoor heat exchanger arranged to exchange heat between a heat transfer medium and refrigerant flowing therethrough;
an expansion valve;
a main refrigerant flow control valve switchable between
a cooling mode in which refrigerant is configured to flow from the discharge line through part of a refrigerant circuit, to the outdoor heat exchanger, to the expansion valve and then to the indoor heat exchanger, and
a heating mode in which refrigerant is configured to flow from the discharge line through part of the refrigerant circuit to the indoor heat exchanger, to the expansion valve and then to the outdoor heat exchanger;

a hot gas reheat heat exchanger connected in the refrigerant circuit;
a fan disposed to direct an airflow across the indoor heat exchanger and the hot gas reheat heat exchanger into a target space;
a receiver connected in the refrigerant circuit, the receiver being configured such that refrigerant flows through the receiver to an inlet side of the expansion valve when the main refrigerant flow control valve is in the cooling mode, and configured such that refrigerant does not flow to the receiver when the main refrigerant control valve is in the heating mode; and
a secondary refrigerant flow control valve switchable between
a first mode in which refrigerant is configured to flow from the discharge line to the main refrigerant flow control valve, and
a second mode in which refrigerant is configured to flow both
from the discharge line to the hot gas reheat heat exchanger and then flows to the main refrigerant flow control valve, and
from the discharge line to the main refrigerant flow control valve without flowing through the hot gas reheat heat exchanger,

the refrigerant circuit and the main and secondary refrigerant flow control valves are configured such that the refrigerant flows to the hot gas reheat heat exchanger before flowing to the outdoor heat exchanger when the main refrigerant flow control valve is in the cooling mode.