US 11,739,992 B2
Air conditioning system with solar-powered subcooling system
Ammar M. Bahman, Safat (KW); Osama Mohamed Ibrahim, Safat (KW); and Sara Barghash, Safat (KW)
Assigned to KUWAIT UNIVERSITY, Safat (KW)
Filed by KUWAIT UNIVERSITY, Safat (KW)
Filed on Mar. 3, 2021, as Appl. No. 17/191,638.
Prior Publication US 2022/0282893 A1, Sep. 8, 2022
Int. Cl. F25B 27/00 (2006.01); F25B 5/02 (2006.01); F25B 40/02 (2006.01); F24F 5/00 (2006.01)
CPC F25B 27/005 (2013.01) [F25B 5/02 (2013.01); F25B 40/02 (2013.01); F24F 2005/0064 (2013.01); F25B 2600/024 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An air conditioning system with a solar-powered subcooling system, comprising:
a main air conditioning system having:
an evaporator;
a compressor;
a condenser;
an expansion valve;
a conduit connecting the evaporator, the compressor, the condenser, and the expansion valve in that order to form a main air conditioning cycle; and
a main air conditioning system refrigerant circulating through the main air conditioning conduit;
a subcooling system having:
a compressor;
a condenser;
an expansion valve;
a conduit connecting the compressor, the condenser, and the expansion valve in that order to form a subcooling cycle;
at least one rechargeable battery connected to the compressor;
a solar photovoltaic panel connected to the at least one rechargeable battery, whereby the subcooling system is powered without additional drain on a main utility system; and
a subcooling system refrigerant circulating through the subcooling conduit; and
a heat exchanger connecting the subcooling system to the main air conditioning system, the heat exchanger having:
a first coil disposed in the main air conditioning conduit between the main air conditioning system condenser and the main air conditioning system expansion valve; and
a second coil disposed in the subcooling conduit between the subcooling system expansion valve and the subcooling system compressor so that the subcooling system further cools the main air conditioning system refrigerant,
wherein said main air conditioning system refrigerant has a refrigerant capacity of 5 tons,
wherein said main air conditioning system refrigerant comprises R-410A,
wherein said main air conditioning system compressor is adapted for receiving electrical power from an a.c. power mains,
wherein said subcooling system compressor is configured for operation on 24 volts d.c.,
wherein said at least one rechargeable comprises a plurality of 12V batteries connected in series, and
wherein said at least one rechargeable battery comprises a first plurality of 12V batteries connected in series and a second plurality of 12V batteries connected in parallel with the first plurality to supply additional current as needed.