Study of Operation Conditions Including a Refrigerant Composition Heat

Zeotrope refrigerant mixtures have been proposed and used for energy saving. Matching the temperature glide of the refrigerant to the temperature change of the heat sink and source, while simultaneously reducing the pressure difference seen by the compressor will result in significantly improved efficiency. A new cycle based on a mixture cascade combined with a rectifier column has recently been introduced to realize this feature. So far this cycle has been studied only with limited cycle calculations and with only one binary refrigerant mixture. To confirm the feasibility of the concept and its full potential, more detailed cycle simulations shall be performed. The refrigerant mixture composition with respect to components and concentrations will be varied and operating conditions will be modified. The design of a breadboard system to be used in a later phase will be completed.