US 12,215,884 B2
Energy efficient heat pump systems and methods
Andrew Leroy Hjortland, Stoughton, WI (US); and Jeremy Ryan Smith, Park City, KS (US)
Assigned to TYCO FIRE & SECURITY GMBH, Neuhausen am Rheinfall (CH)
Filed by Johnson Controls Tyco IP Holdings LLP, Milwaukee, WI (US)
Filed on Nov. 7, 2023, as Appl. No. 18/503,980.
Claims priority of provisional application 63/423,388, filed on Nov. 7, 2022.
Prior Publication US 2024/0151424 A1, May 9, 2024
Int. Cl. F24F 11/84 (2018.01)
CPC F24F 11/84 (2018.01) 20 Claims
OG exemplary drawing
 
1. An energy efficient heat pump for a heating, ventilation, and air conditioning (HVAC) system, comprising:
a working fluid circuit;
a first conduit of the working fluid circuit, wherein the first conduit extends between a first heat exchanger and a second heat exchanger of the working fluid circuit;
a compressor disposed along the working fluid circuit, wherein the compressor is configured to direct a working fluid along the working fluid circuit, and the compressor comprises a suction port, a first injection port, and a second injection port;
an injection conduit extending from the first conduit to the first injection port and the second injection port of the compressor, wherein the injection conduit comprises an expansion device, and the injection conduit is configured to direct a portion of the working fluid from the working fluid circuit, through the expansion device, and to the first injection port and the second injection port of the compressor to inject the portion of the working fluid into the compressor;
a first sensor configured to detect an ambient temperature; and
a controller communicatively coupled to the first sensor and to the expansion device, wherein the controller is configured to:
receive feedback from the first sensor indicative of the ambient temperature;
compare the ambient temperature to a set point temperature;
in response to a first determination that the ambient temperature is equal to or greater than the set point temperature, adjust the expansion device toward an open position; and
in response to a second determination that the ambient temperature is less than the set point temperature, adjust the expansion device toward a closed position.