Different variants of the exhaust process - the adiabatic one, with the supply of heat to the gas discharged from an adiabatic capacity, and the exhaust from a nonadiabatic capacity, and in addition, the effect of the volume of the final heat exchanger on cold production during the exhaust process - are considered. A particular case of variation of parameters in open thermodynamic systems in the course of an exhaust was investigated. An adiabatic discharge from a constant-volume capacity was considered and formulas were obtained for calculating the mass of the gas and temperature depending on pressure. Apart from that, discharge from a capacity with heat supply to the capacity and to a heat exchange which may be installed after the said capacity, was investigated.