Economical Optimization for Double-stage LiBr Absorption Heat Pumps

The internal parameters of double-stage absorption heat pump, such as evaporator temperature T0, condenser temperature Tk, absorber temperature Ta, the concentration difference of second-stage generatorΔξ2, the solution heat exchangers efficiency ηand so on, affects on its coefficient of performance and total heat transfer area. Due to analyze the effects of multi-factorial internal parameters, thermodynamic models and heat transfer models were built for three types of absorption heat pumps and orthogonal arrays were used to reduce the required simulation number. Life cycle cost (LCC) was introduced to find out the optimal designs. This study reveals that the order of LCCs variation as the temperature parameters change is T0, Ta, Tr, Thg and Tk. For the two parallel-flow types of absorption heat pumps the optimalΔξ2 is about 6%. Compare with all the simulation results, the lowest LCC is 736.2×104 RMB.