The invention delivers a solution, which is an energetically and ecologically better method, along with the required device for separating carbon dioxide from the exhaust fumes of combustion engines, based on thermodynamic arrangements. To do so, the gas mass, which is fed to and exhausted from the engine is conditioned in such a way that it is possible to lower the exhaust conditions enough for 〖CO〗_2 condensation. The conditioning is done in regards to temperature and pressure. Doing so causes the carbon dioxide to change its aggregate state to liquid, which makes separation and storing of 〖CO〗_2 possible. The energy for this process is taken out of the engine exhaust and from the engine power. The energy exchange is done with heat exchangers. An additional medium is used as heat storage, while the enthalpy of this medium can be used for recovery processes.
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