Heating Performance Study on a Passive Solar Heater Muhammad Y. Naz, Shaharin A. Sulaiman, Tahir Mahmood, Muhammad I. Hussain, Abdul Ghaffar, Yasir Jamil and Muddasser Inayat MATEC Web Conf., 131 (2017) 02012 Published online: 25 October 2017 DOI: 10.1051/matecconf/201713102012