System for heat utilization, comprising: a heat source; and a cooling device for discharging heat from the heat source; wherein the cooling device comprises: a heat exchanger / radiator for transferring heat to a surrounding medium, wherein in particular the radiator is an air cooler and the surrounding medium is air; and a thermodynamic cycle device, in particular an ORC device, having a working medium, an evaporator for evaporating the working medium by transferring heat of the heat source to the working medium, an expansion device for generating mechanical energy, and a condenser for condensing the working medium expanded in the expansion device; wherein the cooling device comprises a condenser coolant circuit for discharging heat from the condenser of the thermodynamic cycle device via the heat exchanger / radiator; and wherein the cooling device further comprises a heat source coolant circuit, wherein a first branch of the heat source coolant circuit passes through the evaporator for transferring heat to the working fluid; characterized in that the heat source coolant circuit in the flow direction of a cooling fluid upstream of the evaporator comprises a first branch-off into a second branch of the heat source coolant circuit for bypassing the evaporator and a merging of the second branch with the first branch downstream of the evaporator, the second branch comprising a first valve, preferably a controlled valve. a heat source; and a cooling device for discharging heat from the heat source; wherein the cooling device comprises: a heat exchanger / radiator for transferring heat to a surrounding medium, wherein in particular the radiator is an air cooler and the surrounding medium is air; and a thermodynamic cycle device, in particular an ORC device, having a working medium, an evaporator for evaporating the working medium by transferring heat of the heat source to the working medium, an expansion device for generating mechanical energy, and a condenser for condensing the working medium expanded in the expansion device; a heat exchanger / radiator for transferring heat to a surrounding medium, wherein in particular the radiator is an air cooler and the surrounding medium is air; and a thermodynamic cycle device, in particular an ORC device, having a working medium, an evaporator for evaporating the working medium by transferring heat of the heat source to the working medium, an expansion device for generating mechanical energy, and a condenser for condensing the working medium expanded in the expansion device; wherein the cooling device comprises a condenser coolant circuit for discharging heat from the condenser of the thermodynamic cycle device via the heat exchanger / radiator; and wherein the cooling device further comprises a heat source coolant circuit, wherein a first branch of the heat source coolant circuit passes through the evaporator for transferring heat to the working fluid; characterized in that the heat source coolant circuit in the flow direction of a cooling fluid upstream of the evaporator comprises a first branch-off into a second branch of the heat source coolant circuit for bypassing the evaporator and a merging of the second branch with the first branch downstream of the evaporator, the second branch comprising a first valve, preferably a controlled valve.