Optimal design for dual-stage high temperature heat pump by heat exchange area simulation

Adopts the COP as optimized object, takes the heating capability, water velocities and pressure drops in the condenser and evaporator, discharge temperature of compressor as constraint conditions, presents an optimal design method, including optimal design for total area of the condenser and evaporator, optimal design for area ratio of the condenser and evaporator, and optimal design for matched area of the regenerator. Designs the heat exchange area with the established numerical simulation design system. The results show that the optimized calculation is an effective solution for the mismatch of single components. With constant heating performance, optimal design indicates an obvious effect with an 8.6% decrease on total area of exchangers and a 35.5% decrease on total number of evaporating heat exchange tubes.