Abstract: “This paper shows a discussion for selection of thermodynamic operating conditions in an absorption heat transformer (AHT). An AHT is the only thermal machine that increases the source temperature using heat for does it with a negligible mechanical energy. Thermodynamic parameters for AHT are the same than for heat pumps: Coefficient of performance (COP) and Gross Temperature Lift (GTL). Those parameters are not linearly correlated. Instead GTL increases its value when COP decrease. The criterion for an optimal design is based on an objective function with COP and GTL. This paper use AHT thermodynamic data operating with Carrol – water for show the best design operating conditions.”

Keywords: Thermodynamic design, coefficient of performance, Carrol – water, thermal machines, gross temperature lift