Device for safely performing an anti-clockwise thermodynamic Clausius-Rankine cycle process by means of a flammable working fluid, which is heavier than air in a gaseous state under atmospheric conditions and is conducted in a closed, hermetically sealed working fluid circuit, having - at least one compressor for working fluid, - at least one expansion device for working fluid, - at least two heat exchangers (3, 5) for working fluid, each with at least two connections (7, 8, 9, 10) for heat transfer fluids, - a closed and pressure-tight housing, - which comprises all devices connected to the closed working fluid circuit and can comprise further devices, characterised in that the pressure-tight housing is lined with an adsorbent, which is able to adsorb working fluid, and the device also has the following characteristics - at least one further sorption device, by means of which all the working fluid can be adsorbed under normal conditions, - at least one refrigerant discharge safety device, - an external vessel and an external connection between the pressure-tight housing and the external vessel, by means of which the further external vessel is connected directly to the pressure-tight housing, - wherein the further sorption device - consists of a trough in the base of the vessel, which is filled with an adsorbent, - or consists of moulded pads or moulded bodies, which are filled with adsorbent or consist of the latter and which are fitted into the cavities of the pressure-tight housing, - or is formed by a sorption vessel filled with adsorbent within the housing, - or is formed by a sorption vessel filled with adsorbent outside the housing, - or combinations thereof, and a safety device for discharging working fluid into the inside of the pressure-tight vessel is provided within the working fluid circuit. - at least one compressor for working fluid, - at least one expansion device for working fluid, - at least two heat exchangers (3, 5) for working fluid, each with at least two connections (7, 8, 9, 10) for heat transfer fluids, - a closed and pressure-tight housing, - which comprises all devices connected to the closed working fluid circuit and can comprise further devices, characterised in that the pressure-tight housing is lined with an adsorbent, which is able to adsorb working fluid, and the device also has the following characteristics - which comprises all devices connected to the closed working fluid circuit and can comprise further devices, - at least one further sorption device, by means of which all the working fluid can be adsorbed under normal conditions, - at least one refrigerant discharge safety device, - an external vessel and an external connection between the pressure-tight housing and the external vessel, by means of which the further external vessel is connected directly to the pressure-tight housing, - wherein the further sorption device - consists of a trough in the base of the vessel, which is filled with an adsorbent, - or consists of moulded pads or moulded bodies, which are filled with adsorbent or consist of the latter and which are fitted into the cavities of the pressure-tight housing, - or is formed by a sorption vessel filled with adsorbent within the housing, - or is formed by a sorption vessel filled with adsorbent outside the housing, - or combinations thereof, and a safety device for discharging working fluid into the inside of the pressure-tight vessel is provided within the working fluid circuit. - consists of a trough in the base of the vessel, which is filled with an adsorbent, - or consists of moulded pads or moulded bodies, which are filled with adsorbent or consist of the latter and which are fitted into the cavities of the pressure-tight housing, - or is formed by a sorption vessel filled with adsorbent within the housing, - or is formed by a sorption vessel filled with adsorbent outside the housing, - or combinations thereof,