CPC F25B 41/26 (2021.01) [F25B 13/00 (2013.01)] | 19 Claims |
1. An HVAC system for conditioning air in a space, comprising:
a compressor to circulate a refrigerant through a refrigerant circuit;
a source heat exchanger operable as a condenser for exchanging heat with a source fluid;
a first source heat exchanger bypass circuit comprising a first bi-directional valve;
a second source heat exchanger bypass circuit comprising a second bi-directional valve positioned downstream of the compressor;
a load heat exchanger operable as an evaporator for cooling the air in the space;
a desuperheater heat exchanger operable as a condenser for heating water, wherein the desuperheater heat exchanger is positioned downstream of the compressor;
a desuperheater bypass circuit comprising a third bi-directional valve positioned downstream of the compressor;
a 3-way valve disposed along the refrigerant circuit and positioned downstream of the third bi-directional valve and between the desuperheater heat exchanger and the source heat exchanger, the 3-way valve including a first port configured to receive the refrigerant from the desuperheater heat exchanger, a second port configured to receive the refrigerant from the third bi-directional valve or to direct the refrigerant to the first bi-directional valve, and a third port configured to direct the refrigerant to the source heat exchanger, wherein the 3-way valve is configured to selectively receive the refrigerant from either the desuperheater heat exchanger or from the third bi-directional valve and to selectively direct the refrigerant to either the source heat exchanger or to the first bi-directional valve;
an expansion valve positioned between the source heat exchanger and the load heat exchanger;
wherein the first bi-directional valve is configured to direct the refrigerant from the 3-way valve to the expansion valve to bypass the source heat exchanger;
wherein the second bi-directional valve modulates exchange of heat in the load heat exchanger and controls flashing of the refrigerant entering the source heat exchanger; and
a controller comprising a processor and memory on which one or more software programs are stored, the controller configured to control operation of the compressor, the 3-way valve, the first, second, and third bi-directional valves, the expansion valve, a first variable speed pump for circulating the water through the desuperheater heat exchanger, and a second variable speed pump for circulating the source fluid through the source heat exchanger.
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