*Proceeding Paper* **Experimental Investigation of Impact of Cool Roof Coating on Bifacial and Monofacial Photovoltaic Modules †**

**Khalid Mahmood \*, Abid Hussain, Muhammad Arslan and Bilal Tariq**

Department of Mechanical Engineering, University of Engineering and Technology Taxila, Taxila 47050, Pakistan; abid.hussain@uettaxila.edu.pk (A.H.); m.arslan5330@gmail.com (M.A.); thebilaltariq@gmail.com (B.T.)

**\*** Correspondence: 96khalidghumman@gmail.com

† Presented at the Third International Conference on Advances in Mechanical Engineering 2023 (ICAME-23), Islamabad, Pakistan, 24 August 2023.

**Abstract:** Cool roof coatings are being applied on rooftops to reflect solar irradiance back into the atmosphere. Bifacial photovoltaic modules can receive solar irradiance from the front and rear side. The purpose of this study is to investigate the impact of reflected irradiance caused by cool roof coating (CRC) on the performance of bifacial photovoltaic (bPV) modules and monofacial photovoltaic (mPV) modules. According to the experiments, cool roof coating is an efficient way to increase the output and efficiency of solar modules. Experimental results show that for cool roof coating based on TiO2 and FC resin with an average albedo of 0.63, the peak power output of the bifacial photovoltaic module is increased by 3.29% and its highest peak power efficiency is 18.1%. A peak power bifacial gain of 15.6% is seen. Due to a 1.3 ◦C decrease in temperature, the monofacial photovoltaic module power output also increased by 0.24%.

**Keywords:** bifacial photovoltaic module (bPV); monofacial photovoltaic module (mPV); cool roof coating; albedo; bifacial gain; efficiency of photovoltaic module
