US 11,656,005 B2
CO2 cooling system and method for operating same
Marc-André Lesmerises, Trois-Rivières (CA); and Tommy Dolbec, Batiscan (CA)
Assigned to GESTION MARC-ANDRÉ LESMERISES INC., Trois-Rivières (CA)
Filed by Marc-André Lesmerises, Trois-Rivières (CA)
Filed on Apr. 29, 2016, as Appl. No. 15/143,203.
Claims priority of provisional application 62/154,982, filed on Apr. 30, 2015.
Prior Publication US 2016/0320098 A1, Nov. 3, 2016
Int. Cl. F25B 9/10 (2006.01); F25B 9/00 (2006.01); F25C 3/02 (2006.01); F25B 5/02 (2006.01); F25B 43/00 (2006.01); F25B 43/02 (2006.01); F25B 49/02 (2006.01); F25B 41/20 (2021.01); F25B 41/00 (2021.01); F25B 6/02 (2006.01)
CPC F25B 9/008 (2013.01) [F25B 5/02 (2013.01); F25B 9/10 (2013.01); F25B 41/20 (2021.01); F25B 43/00 (2013.01); F25B 43/006 (2013.01); F25B 43/02 (2013.01); F25B 49/02 (2013.01); F25C 3/02 (2013.01); F25B 6/02 (2013.01); F25B 41/00 (2013.01); F25B 2309/061 (2013.01); F25B 2339/047 (2013.01); F25B 2400/075 (2013.01); F25B 2500/07 (2013.01); F25B 2600/2511 (2013.01); F25B 2700/191 (2013.01); F25B 2700/21 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A CO2 cooling system, comprising:
a compression stage in which CO2 refrigerant is compressed;
a cooling stage in which the compressed CO2 refrigerant releases heat;
a CO2 liquid receiver receiving CO2 refrigerant from the cooling stage;
an evaporation stage in which the CO2 refrigerant, having released heat in the cooling stage, absorbs heat, wherein the evaporation stage comprises a first evaporation sector and a second evaporation sector;
a CO2 accumulator receiving CO2 refrigerant exiting the evaporation stage, wherein a first portion of the CO2 refrigerant from the CO2 accumulator is directed to the compression stage;
a first metering device mounted downstream of the CO2 liquid receiver and upstream of the first evaporation sector, wherein the first metering device is an expansion valve feeding CO2 refrigerant from the CO2 liquid receiver into the first evaporation sector;
a second metering device mounted downstream of the CO2 accumulator and upstream of the second evaporation sector, wherein the second metering device is a pump pumping a second portion of the CO2 refrigerant from the CO2 accumulator into the second evaporation sector;
a first transfer line transferring a first portion of the CO2 refrigerant from the cooling stage to the first metering device; and
a second transfer line transferring a second portion of the CO2 refrigerant from the cooling stage to the CO2 accumulator and then from the CO2 accumulator to the second metering device;
wherein the CO2 liquid receiver and the CO2 accumulator are separate reservoirs;
wherein the first metering device and the second metering device are operated independently from one another, CO2 pressure in the first evaporation sector being different than CO2 pressure in the second evaporation sector;
wherein the CO2 refrigerant is circulatable in a closed-loop circuit;
wherein the evaporation stage comprises a circuit of pipes extending under an ice-playing surface with the circuit of pipes including at least one first pipe line corresponding to the first evaporation sector and at least one second pipe line corresponding to the second evaporation sector; and
wherein the first pipe line extends below a central section of the ice-playing surface and the second pipe line extends below an outer section of the ice-playing surface.