US 11,965,672 B2
Water source heat pump dual functioning condensing coil
Marcos Locke, Baldwinsville, NY (US); and Benny DiMarco, Clay, NY (US)
Assigned to DAIKIN APPLIED AMERICAS INC., Minneapolis, MN (US)
Filed by Daikin Applied Americas Inc., Minneapolis, MN (US)
Filed on Jun. 6, 2022, as Appl. No. 17/833,447.
Application 17/833,447 is a continuation of application No. 16/146,001, filed on Sep. 28, 2018, granted, now 11,378,290.
Claims priority of provisional application 62/569,188, filed on Oct. 6, 2017.
Prior Publication US 2022/0299215 A1, Sep. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F24F 3/153 (2006.01); F25B 13/00 (2006.01); F25B 30/02 (2006.01); F25B 30/06 (2006.01); F25B 49/02 (2006.01)
CPC F24F 3/153 (2013.01) [F25B 13/00 (2013.01); F25B 30/02 (2013.01); F25B 30/06 (2013.01); F25B 49/02 (2013.01); F25B 2313/004 (2013.01); F25B 2313/009 (2013.01); F25B 2313/02731 (2013.01); F25B 2313/02741 (2013.01); F25B 2600/2517 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A heat pump system comprising:
a compressor, the compressor delivering compressed refrigerant to a discharge line and receiving a refrigerant from a suction line;
a usage side heat exchanger;
a heat source side 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 heat source side heat exchanger, to the expansion valve and then to the usage side 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 usage side heat exchanger, to the expansion valve and then to the heat source side heat exchanger;
a hot gas reheat heat exchanger connected in the refrigerant circuit;
a fan disposed to direct an airflow across the usage side 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
at least one 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,
a second mode in which at least some refrigerant is configured to flow from the discharge line to the hot gas reheat heat exchanger and then flows to the main refrigerant flow control valve, and
a third 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 being configured such that refrigerant flows to the usage side heat exchanger and the hot gas reheat heat exchanger when the main refrigerant flow control valve is in the heating mode, and
the refrigerant circuit and the main and secondary refrigerant flow control valves being configured such that the refrigerant flows to the hot gas reheat heat exchanger before flowing to the heat source side heat exchanger when the main refrigerant flow control valve is in the cooling mode.
 
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.
 
13. A heat pump system comprising:
a compressor, the compressor delivering compressed refrigerant to a discharge line and receiving a refrigerant from a suction line;
a usage side heat exchanger;
a heat source side 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 heat source side heat exchanger, to the expansion valve and then to the usage side 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 usage side heat exchanger, to the expansion valve and then to the heat source side heat exchanger;
a hot gas reheat heat exchanger connected in the refrigerant circuit;
a fan disposed to direct an airflow across the usage side 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
at least one 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,
a second mode in which at least some refrigerant is configured to flow from the discharge line to the hot gas reheat heat exchanger and then flows to the main refrigerant flow control valve, and
a third 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 being configured such that refrigerant flows to the usage side heat exchanger when the main refrigerant flow control valve is in the heating mode, and
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 heat source side heat exchanger when the main refrigerant flow control valve is in the cooling mode.