US 12,326,274 B2
Air-conditioning system with variable subcooling
Gus Daniel Olivera, Winter Garden, FL (US)
Assigned to Addison HVAC LLC, Orlando, FL (US)
Filed by Addison HVAC LLC, Orlando, FL (US)
Filed on Jul. 12, 2024, as Appl. No. 18/771,017.
Application 18/771,017 is a continuation of application No. 17/948,071, filed on Sep. 19, 2022, granted, now 12,055,316.
Claims priority of provisional application 63/245,454, filed on Sep. 17, 2021.
Prior Publication US 2024/0369240 A1, Nov. 7, 2024
Int. Cl. F24F 3/153 (2006.01); F24F 13/30 (2006.01); F25B 41/20 (2021.01)
CPC F24F 3/153 (2013.01) [F24F 13/30 (2013.01); F25B 41/20 (2021.01); F25B 2600/25 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A dedicated outdoor air-conditioning system comprising:
an evaporator, a condenser, a compressor, a refrigerant receiver, and a control system for circulating refrigerant through the condenser and the evaporator, the evaporator having a refrigerant inlet, and the compressor having a refrigerant outlet;
an air handler that moves an air flow over the evaporator which conditions the air flow to a desired temperature and humidity prior to entering a conditioned room;
a heat exchanger coil that subcools refrigerant from a subcooling heat exchanger to the refrigerant inlet of the evaporator and wherein the subcooling heat exchanger reheats the airflow downstream of the evaporator to lower a relative humidity of the air flow;
the control system including a modulating valve for modulating a refrigerant flow through the subcooling heat exchanger, and an actuator connected to the modulating valve for moving the valve in response to a sensed air flow temperature or humidity or a sensed refrigerant temperature, humidity, or pressure,
wherein the modulating valve modulates the reception of refrigerant from the compressor and receiver and directs the flow of refrigerant toward the evaporator.
 
7. A method of operating a dedicated outdoor air-conditioning system apparatus comprising an evaporator, a condenser, a compressor, a refrigerant receiver, and refrigerant through the condenser and the evaporator, said method comprising the steps of:
operating a control system including a modulating valve to modulate the reception of refrigerant from the compressor and receiver and directing the flow of refrigerant toward the evaporator, and an actuator connected in the modulating valve for moving the valve in response to a sensed air flow temperature or humidity or a sensed refrigerant temperature, humidity, or pressure;
generating an air flow over the evaporator to cool the air flow;
subcooling refrigerant being delivered to the evaporator;
reheating the air flow downstream from the evaporator to further lower the relative humidity of the air flow; and
modulating the flow of refrigerant via the control system.