The amount of energy usage per person has shown to increase with every year. With increase in population and depletion of non-renewable sources of energy, there is a growing need for the development of energy harvesters using renewable sources of energy. This paper aims to set a base study to address the problem of lack of energy harvesters using a lesser known renewable source of energy-rain. This paper presents a theoretical rooftop model that has been subjected to a mix of wind-water fluid simulate conditions of a rainy weather and the test data were recorded. ANSYS analysis has been performed with the fluid velocity being set at 20 m/s, 30 m/s, 40 m/s and 50 m/s which strikes the roof of a building kept at 0°, 45° and 60°. The objectives of this paper is to determine the amount of voltage that can be generated from pressure developed by the fluid striking the model surface. The pressure values, obtained from ANSYS simulation, were then used to show that the method is viable to be applied on piezoelectric cells to generate electricity from rain and wind hence the study can be used to develop a sustainable model using rain as a renewable source of energy. Low level voltage can be generated from rain striking on piezoelectric material.

Currently there is a demand for clean renewable sources of energy. Very few developments have been done to harvest energy from natural phenomenon such as rain drops. The objective of this paper is to identify the pressure that can be developed from rain drops hitting the surface of a piezoelectric cell and the respective voltage that can be generated from it. This paper presents a model that has been developed to harvest the kinetic energy of rain using piezoelectric devices. The roof of the model was kept at 45° and subjected to load test and water pressure test to simulate conditions of a rainy weather and the test data were recorded. ANSYS analysis has also been performed with the fluid velocity being set at 20 m/s, 30 m/s, 40 m/s and 50 m/s which strikes the roof of a building kept at 0°, 45° and 60°. The analytical results were compared to the model experimental results for validating the process. Experimental results from the prototype recorded that a maximum of 18.7 Volts of electrical energy can be generated. This study proves that the harvesting small energy from rain is significant as a secondary source of green energy that could compliment to the green energy system.