Investigation of thermodynamic properties of alternative fluid couples forabsorption thermal systems

One of the reasons for depletion of the ozone layer of the atmosphere is th e use of materials in different industrial brands which have disintegrating effects on ozone in their compositions. It is known that thermodynamic ana lysis of the operating processes of machines and systems that use heat ener gy depends on calculations of the heat transfer processes of parts of the s ystem and choices of the thermohydrodynamic regimes and parameters. In this study, an experimental investigation is conducted on the thermal propertie s which are close to the curves of liquid and two phase boiling and condens ing of two new fluid couples for absorption cooling systems, and absorption heat pumps which are better ecologically. The obtained results are analyze d, and new equations are given. Experiments are done for methanol-LiBr and methanol-LiCl solutions with changes of pressure, changes of temperature an d concentrations of solutions in the ranges of 0.1-40 MPa, 298-498 K, 2-12% , respectively. During the experiments, extreme care is taken to keep the s olution concentration stable, and the obtained results are analyzed in diff erent thermodynamical coordinates. State equations are constructed accordin g to the values of specific volume, and the main thermodynamical properties are calculated with the use of the differential equations of thermodynamic s. Values related with these calculations are given in tables. (C) 2000 Els evier Science Ltd. All rights reserved.