**6. Conclusion**

Using the SCPC system provides many advantages for indoor environments and achieves energy saving for cooling inside indoor room environments of hot arid regions. It is concluded that the airflow rate through a solar chimney system is greatly affected by the pressure difference between openings caused by temperature across the chimney surface. The results indicate that using the SCPC system reduced indoor temperature to be within the 90% acceptable comfort range. The SCPC system is considered a passive cooling air conditioning system that achieves a significant reduction of indoor temperature between 6 and 7 K based on the condition of the wet pad. The findings from the experimental and numerical calculations were in good agreement. Installation of the solar chimney parts and building the short wind tower are based on the available and conventional materials in the Egyptian market. The results of this research will be used to develop a new cooling system for low energy consumption (only 18 W for the water pump). The new cooling system is made of local materials and provides fresh cooled air with good indoor air quality. The materials of the system have high durability and made from normal glass, aluminum plate and standard brick for the tower. These materials are available at the local market and need simple modification in the ceiling structure of the upper flat. The system structure and materials need no specific manufacturing technology. The operation cost for the system is very low as it depends on solar radiation only. The 0.1-m thick evaporation pad in the tower can be changed nearly every 5 years with simple cleaning required every summer. This new cooling system can be integrated in the housing projects (National Housing Authority) of low-income people in new and existing cities. Adopting this system makes a significant improvement in building energy conservation.

#### **Acknowledgements**

The research leading to these results has received funding from Science and Technology Development Fund (Ministry of Higher Education and Scientific Research), project no. 10255—National Challenges Program. The author gives special thanks to the engineers in the ITT unit of Assiut University for their help and using thermal camera.
