- A refrigeration apparatus comprising: - a main refrigerant circuit including a positive displacement compressor, a condenser, an expansion valve, and an evaporator, through which a refrigerant circulates successively in a closed loop circulation; - a lubrication refrigerant line connected to the main refrigerant circuit between the condenser and the expansion valve or to the condenser, in which circulates a portion of the refrigerant of the main refrigerant circuit and connected to the compressor for lubrication of said compressor with the refrigerant; wherein the refrigeration apparatus comprises: - at least one lubrication refrigerant storing cavity connected to the lubrication refrigerant line, the lubrication refrigerant storing cavity being configured to store liquid refrigerant for lubrication of the compressor said at least one lubrication refrigerant storing cavity being provided within the compressor, and being in fluid connection with at least a compression chamber of the compressor; characterized in that it further comprises: - at least one cooling device provided within the compressor and configured to cool down the refrigerant stored in said at least one lubrication refrigerant storing cavity prior to a starting operation of the refrigeration apparatus wherein the at least one lubrication refrigerant storing cavity comprises a duct connecting the at least one cavity to a hole of a housing of the compressor, said hole being in fluid connection with the lubrication refrigerant line, and wherein the at least one cooling device comprises at least one thermoelectric cooler which is provided around the duct with a cold side located in the duct or forming a portion of the duct, and a hot side mounted in the housing opposite from the duct, and wherein the refrigeration apparatus comprises several lubrication refrigerant storing cavities distributed within the compressor, at least one of said lubrication refrigerant storing cavities being in connection with the compression chamber, and at least one of said lubrication refrigerant storing cavities being in connection with bearing chambers (51, 55) within the compressor. - a main refrigerant circuit including a positive displacement compressor, a condenser, an expansion valve, and an evaporator, through which a refrigerant circulates successively in a closed loop circulation; - a lubrication refrigerant line connected to the main refrigerant circuit between the condenser and the expansion valve or to the condenser, in which circulates a portion of the refrigerant of the main refrigerant circuit and connected to the compressor for lubrication of said compressor with the refrigerant; - at least one lubrication refrigerant storing cavity connected to the lubrication refrigerant line, the lubrication refrigerant storing cavity being configured to store liquid refrigerant for lubrication of the compressor said at least one lubrication refrigerant storing cavity being provided within the compressor, and being in fluid connection with at least a compression chamber of the compressor; characterized in that it further comprises: - at least one cooling device provided within the compressor and configured to cool down the refrigerant stored in said at least one lubrication refrigerant storing cavity prior to a starting operation of the refrigeration apparatus wherein the at least one lubrication refrigerant storing cavity comprises a duct connecting the at least one cavity to a hole of a housing of the compressor, said hole being in fluid connection with the lubrication refrigerant line, and wherein the at least one cooling device comprises at least one thermoelectric cooler which is provided around the duct with a cold side located in the duct or forming a portion of the duct, and a hot side mounted in the housing opposite from the duct, and wherein the refrigeration apparatus comprises several lubrication refrigerant storing cavities distributed within the compressor, at least one of said lubrication refrigerant storing cavities being in connection with the compression chamber, and at least one of said lubrication refrigerant storing cavities being in connection with bearing chambers (51, 55) within the compressor. - at least one cooling device provided within the compressor and configured to cool down the refrigerant stored in said at least one lubrication refrigerant storing cavity prior to a starting operation of the refrigeration apparatus wherein the at least one lubrication refrigerant storing cavity comprises a duct connecting the at least one cavity to a hole of a housing of the compressor, said hole being in fluid connection with the lubrication refrigerant line, and wherein the at least one cooling device comprises at least one thermoelectric cooler which is provided around the duct with a cold side located in the duct or forming a portion of the duct, and a hot side mounted in the housing opposite from the duct, and wherein the refrigeration apparatus comprises several lubrication refrigerant storing cavities distributed within the compressor, at least one of said lubrication refrigerant storing cavities being in connection with the compression chamber, and at least one of said lubrication refrigerant storing cavities being in connection with bearing chambers (51, 55) within the compressor.