any theory presented in the preceding background or the following detailed description identical or similar components on the figures are provided with the same reference number fig1 schematically depicts a refrigerant circuit 1 for arrangement in a motor vehicle not shown a refrigerant circulates in the refrigerant circuit 1 so that a heat flow qw can be absorbed from an internal space and a heat flow qk can be released to the environment the refrigerant is compressed in a gaseous state in a compressor 2 the compressor 2 can be driven in a manner not depicted for example by means of an endless belt coupled with an internal combustion engine while the refrigerant is being compressed in the compressor 2 the pressure of the refrigerant increases and the refrigerant becomes warm in the process the heat can be released to the environment via the heat flow qk in a capacitor 3 in the capacitor 3 the refrigerant is liquefied during release of the heat flow qk an output 4 of the capacitor 3 is joined in a fluid carrying manner with an input of a collection tank 5 the refrigerant can accumulate in the collection tank 5 until it gets into a coaxial line section 7 by way of a connection 6.