Refrigerating Circuit And Method Of Selectively Cooling Or Defrosting An Evaporator Thereof

Refrigerating circuit comprising a compressor, a condenser/gas cooler, an expansion device, an evaporator, and refrigerant conduits circulating a refrigerant therethrough,

• wherein the evaporator comprises refrigerant piping comprising a plurality of substantially horizontal layers each layer comprising a plurality of pipes the pipes being substantially perpendicular to an air flow direction from an air inlet region to an air outlet region of the evaporator,
• wherein a pipe selected from the group of the second pipe to the last but one pipe in the bottom layer forms the entry pipe of the evaporator,
• wherein the entry pipe is connectable with the expansion device to provide a refrigerating mode,
• wherein the entry pipe is connectable with a hot gas conduit to provide a defrosting mode for the evaporator, and
• wherein a first section of the refrigerant piping of the evaporator comprises the entry pipe and the pipes on the bottom layer that are downstream of the entry pipe with regard to the air flow direction.

Method of selectively cooling or defrosting an evaporator of a refrigerating circuit, the method comprising:

• compressing a refrigerant,
• flowing the refrigerant through a gas cooler/condenser and an expansion device, when cooling is selected, or flowing the refrigerant through a hot gas by-pass conduit, when defrosting is selected,
• flowing the refrigerant through refrigerant piping of the evaporator, the refrigerant piping comprising a plurality of substantially horizontal layers each layer comprising a plurality of pipes, and
• flowing air through the evaporator with the air flow direction being substantially perpendicular to the orientation of the pipes,
• wherein the refrigerant enters the refrigerant piping of the evaporator at a pipe of the group from the second pipe to the last but one pipe in the bottom layer, and
• wherein the refrigerant flows through a first section of the refrigerant piping of the evaporator comprising the entry pipe and the pipes on the bottom layer that are downstream of the entry pipe with regard to the air flow direction.