PhD Thesis - Energy Systems Research Unit - University of Strathclyde

weak solution branch calculated using equation (3.20) (from Florides et al. [35]).- (3.20)Equations and assumptions used to find Q gRecall from equation (3.7) that:The specific enthalpy of point 4, h 4 , the strong solution at the exit of the generator isagain found using equation (3.16); h 3 , is calculated as shown in equation (3.21).- (3.21)The specific enthalpy (in kJ/kg) of point 2, h 2 , the weak solution at the exit of thepump is calculated using equation (3.22) – h 1 plus the pressure difference across thepump divided by the density of the solution (Florides et al. [35]).- (3.22)The algorithm describing the operation of the component is shown in Appendix ‘E’.3.3.5 Model calibrationA three-stage model calibration process is used to obtain the data needed to run themodel. Stage 1 and stage 2 develop the chiller ‘performance map’, whilst stage 3identifies the dynamic characteristics. Specifically, in:Stage 1 - Expressions for the high and low operating pressures are derived as115