فهرس المقالات energy حرية الوصول المقاله صفحة الملخص نص كامل 1 - Investigating the use of PCM on the performance of solar water heaters in cloudy and sunny weather by using nanoparticles in their structure to reduce energy consumption in buildings Saeed Samadzadeh Baghbani Farivar Fazelpour Hossein Ahmadi Danesh Ashtiani