Economic performance evaluation of the wind supercharging solar chimney power plant combining desalination and waste heat after parameter optimization

In this paper, the economic analysis model of solar chimney power plant combining seawater desalination and waste heat (SCPPDW) and wind supercharging solar chimney power plant combining seawater desalination and waste heat (WSCPPDW) was established. Based on net present value (NPV) method, the economic performance of two systems and that of WSCPPDW after optimization were studied. It was found that the addition of wind supercharging device increased the net income (NET) and NPV by 42.8% and 102.5%, respectively. With the increase of time, the annual NET of two systems increased, and the annual NPV firstly increased and then decreased. The annual NET and NPV of WSCPPDW were always larger than those of SCPPDW, which were negative in the first four years, but those of WSCPPDW were only negative in the first year. After sequentially optimizing the turbine rotational speed, nozzle length, chimney outlet radius and mixing section length, the power and freshwater output of WSCPPDW were improved by 455.8% and 11.7%, respectively. And the total net income (TNET) and total net present value (TNPV) were increased by 183.4% and 442.8%, respectively. The declining inflection point of annual NPV was brought forward by 10 years compared to that of initial WSCPPDW.