A Framework For Epbt Calculation Of Roof Mounted Photovoltaic Systems
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A FRAMEWORK FOR EPBT CALCULATION OF ROOF MOUNTED PHOTOVOLTAIC SYSTEMS
Currently, most of the world’s energy is derived from fossil fuels (World Energy Resources 2013 Survey). Fossil fuels are a limited resource and might not be able to meet the future energy requirements of the world for too long (Shafiee and Topal 2009). Apart from being non-renewable, these are also significant contributors of greenhouse gases to the environment leading to air, water and land pollution (Marland and Rotty 1984). Due to the nature of these resources there is an urgent need to conserve these resources. It is also important to explore alternative energy sources for the future.To this end, multiple solutions have been proposed. One of the most…show more content… It can be anywhere in between 3 years to 30 years or even more depending on a multitude of factors.
Energy pay-back time (EPBT):
“ The Energy Pay Back Time is defined by EPBT = Einput/Esaved, where Einput is the energy input during the module life cycle (which includes the energy required for manufacturing, installation, energy use during operation, and energy needed for decommissioning) and Esaved the annual energy savings due to electricity generated by the PV module. EPBT depends on a number of factors: cell technology, type of encapsulation, frame and array support, module size & efficiency, PV system application type (autonomous or grid-connected) and, finally, PV system performance as determined by irradiation and the performance ratio. EPBT is also affected by factors that do not directly relate to the characteristics of the PV power system itself: conversion efficiency of the electricity supply system and energy requirements of materials like glass, aluminum etc. ” (Alsema 2000)
In order to determine the EPBT of a photovoltaic system, it is very important to determine the total energy that is required to manufacture, install, transport and dispose the system as well as energy required for any other purpose during the life cycle of the system.
A typical PV system consists of different components. The components of a PV system can be classified into two categories:
1. The Panel: This consists of the panel
2. Balance of system (BOS):