To efficiently utilize waste heat from ships exhaust gases and engine cooling water, an organic Rankine cyclevapor compression refrigeration (ORCVCR) system was employed for airconditioning and a thermodynamic model was developed. Six working fluids of R123, R134a, R245fa, R600, R600a and R290 were selected and compared in order to identify suitable working fluids which may yield high system efficiencies. The calculated results show that R600a is the most appropriate working fluid not only for ORC but also for VCR and ORC/VCR. Heat source temperature and condensation temperature have important influences on system performance. Hot water temperature can be controlled and adjusted by changing mass flow of hot water, thereby optimizing the system performance. To ensure condensation temperature and attain the optimal overall performance, system performance, power consumption, heat exchanger area and system investment should be comprehensive considered.
Key words
ships waste heat /
air-conditioning /
organic Rankine cycle-vapor compression /
working fluids selection /
expander
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