Simulation of a solar driven aqua-ammonia absorption refrigeration system Part 1: mathematical description and system optimization

Performance improvement of absorption heat transformer

“…In this work, the equations derived by Ziegler, Trepp and Shultz [25][26][27] for aquaammonia mixtures using the Gibbs free energy functions in both the liquid and gas phases (in) are used. The specific volume, enthalpy and entropy are expressed as a function of the Gibbs free energy, respectively, as follows:…”

Effect of irreversibilities on performance of an absorption heat transformer used to increase solar pond’s temperature

“…where the values of A and B are defined as follows: In this work, the equations derived by Ziegler and Trepp and Shultz [21,22,23] for aqua-ammonia mixtures for the Gibbs free energy functions in both the liquid and gas phases in are used. The specific volume, enthalpy and entropy are expressed as a function of the Gibbs free energy, respectively, as follows:…”

Performance parameters of an ejector-absorption heat transformer

“…where the values of A and B are defined as follows: In this study, the equations, derived by Ziegler and co-workers [27][28][29] for aquaammonia mixtures depend on the Gibbs free-energy functions in both the liquid and gas phases, are used. The specific volume, enthalpy and entropy are expressed as functions of the Gibbs free energy, respectively, as follows:…”