An energy transfer system, a method of manufacturing thereof, and a method of increasing a thermal stability of a working fluid therein

A method of manufacturing an energy transfer system, the method comprising:

• providing a thermal circuit with a working fluid configured to perform a thermodynamic cycle and/or an energy transfer process, the thermal circuit provided with a piping system for conveying the working fluid and at least one energy transfer device, wherein the energy transfer device is configured to transfer a portion of energy from one part of the thermal circuit to another part of the thermal circuit;
• and
• providing at least a portion of the thermal circuit with a coating layer on surfaces in contact with the working fluid, wherein the coating layer includes inert material that is inert with respect to the working fluid during operation and which maintains structural integrity at a temperature above 550 K, and wherein the inert material when in a pure state/form has a thermal conductivity above 500 W/mK at room temperature.

A method of increasing a thermal stability limit temperature of a working fluid in an energy transfer system, the method including coating one or more surfaces in contact with the working fluid with a coating layer, wherein the coating layer includes an inert material which maintains structural integrity at a temperature above 550 K, and wherein the inert material when in a pure state/form has a thermal conductivity above 500 W/mK at room temperature.