PhD Thesis - Energy Systems Research Unit - University of Strathclyde

general form of equation (3.16) [33].- (3.16)In the case of h 1 , the temperature is T 1 and the solution concentration is X 1 . On theother hand, assuming again that the expansion process in the expansion valve iscompletely adiabatic, h 6 is equal to h 5 . T 5 which is used to find h 5 is in this casecalculated using equation (3.17). T 5 is assumed to be slightly lower than the midpointtemperature between the generator and the absorber [17]. ƞ is the recovery heatexchanger efficiency.- (3.17)The specific enthalpy (in kJ/kg) at Point 7, h 7 , the exit point of the refrigerant fromthe generator assumed to be superheated at temperature T 7 and pressure p high , iscalculated using equation (3.18) (from Florides et al. [35]).- (3.18)In equation (3.18) T 8 is the saturation temperature at the high cycle pressure p high ,whilst T 7 is calculated using equation (3.19); the mean temperature of the solutionflows in and out of the generator [17].- (3.19)c weak is the specific heat (in kJ/kgK) of the lithium bromide-water solution inside the114