Patent ID: 9464828
Filing Date: 2016-10-11
CPC Classification: F25B

Claim Text:
1. A natural coolant refrigerating plant comprising: a motor-driven compressor with a first compression stage and a second compression stage, at least one container for containing a food product to be processed; at least one jacket associated with the at least one container for at least one chosen from heating and cooling the food product to be processed, a first circuit for cooling the food product to be processed; a second circuit for heating the food product to be processed; the first circuit and the second circuit each having an inlet connected together to receive coolant from an outlet of the second compression stage; the first circuit and the second circuit each having an outlet connected to the at least one cooling jacket to supply coolant to the at least one cooling jacket; at least one valve positioned between the at least one cooling jacket and the outlets of the first circuit and second circuit for selectively connecting the first circuit to the at least one cooling jacket for cooling the food product to be processed and the second circuit to the at least one cooling jacket for heating the food product to be processed; an intercooler located upstream of the second compression stage, a gas-cooler located downstream of an outlet from the second compression stage and forming part of the first circuit; a first branch connecting an outlet of the gas-cooler with an inlet of the first compression stage of the motor-driven compressor for recovering a predetermined quantity of coolant; a first branch valve positioned in the first branch for controlling flow of coolant in the first branch; a controller controlling the first branch valve to 1) block coolant flow through the first branch when the at least one valve is controlled to selectively connect the first circuit to the at least one cooling jacket for cooling the food product to be processed and to 2) flow coolant through the first branch when the at least one valve is controlled to selectively connect the second circuit to the at least one cooling jacket for heating the food product to be processed.