Non-conventional thermodynamic converters for low temperature geothermal applications

Non-conventional thermodynamic converters suitable for low temperature geothermal applications have been considered in the present paper. The first type, called a thermogravimetric system, TG, runs with a direct cycle: this is capable of transforming thermodynamic energy into mechanical-electric energy. The second type, called a thermogravimetric heat pump, TGHP, works with an inverse cycle. The values of the cycle extreme temperatures make a TGHP appear more promising than a thermogravimetric system and therefore it has been analysed in more detail.