Refrigerant cycle unit

A refrigerant cycle unit comprising a utilizing side heat exchanger arranged to be capable of heat exchanging with a space to be air-conditioned, a heat source side heat exchanger arranged outside the space to be air-conditioned, and a compressor for compressing and delivering a refrigerant, and using carbon dioxide as the refrigerant and pressure on high pressure side becoming possibly supercritical pressure,

• wherein an internal heat exchanger is provided for heat exchanging the refrigerant discharged from the utilizing side heat exchanger and the refrigerant discharged from the heat source side heat exchanger,
• a heating mode can be performed in which the refrigerant delivered from the compressor is caused to flow into the utilizing side heat exchanger so as to give off heat, and after the refrigerant which has given off the heat in the utilizing side heat exchanger has been decompressed, the refrigerant is caused to flow into the heat source side heat exchanger so as to absorb heat and to be returned to the compressor, and
• a cooling mode can be performed in which the refrigerant delivered from the compressor is caused to flow into the heat source side heat exchanger so as to give off heat, and after the refrigerant which has given off the heat in the heat source side heat exchanger has been decompressed, the refrigerant is caused to flow into the utilizing side heat exchanger so as to absorb heat and to be returned to the compressor, and
• wherein the heat exchanged amount of the refrigerant in the internal heat exchanger in the cooling mode is greater than the heat exchanged amount in the heating mode.