THERMODYNAMIC PROPERTIES OF LITHIUM-BROMIDE/WATER SOLUTIONS WITH APPLICATION TO AN ABSORPTION TEMPERATURE BOOSTING HEAT PUMP (GIBBS FREE ENERGY).

摘要

This investigation concerns the thermodynamic properties of LiBr/H(,2)O solutions relevant to absorption chillers and heat pumps.; At the outset of the present study, efforts to quantify the thermodynamic performance of absorption cycles were hindered by a lack of consistent enthalpy and entropy data on the absorption pair, LiBr/H(,2)O. Accordingly, the principal objective of this investigation is the generation of an analytic Gibbs free energy expression for LiBr/H(,2)O from which accurate values of thermodynamic properties can be readily calculated. The Gibbs free energy expression involves 37 constants and accurately reproduces density, specific heat and vapor pressure values as well as enthalpy and entropy values. The versatility of the Gibbs free energy expression in calculating consistent and accurate thermodynamic properties over the entire range of the independent variables relevant to absorption system analysis makes it a significant new tool in the analysis of absorption systems.; The Gibbs free energy expression is utilized to calculate the thermodynamic property values required for first and second law analyses of the components of an innovative absorption cycle known as a temperature boosting heat pump cycle. These analyses provide both a quantitative evaluation of the sources of irreversibility and a refined understanding of the practical potential of the cycle. The cycle analysis reported upon is believed to be the first in which the absorption temperature booster cycle components have been analysed comprehensively using both the first and second laws.