Abstract
Exergy analysis is an advanced and a fair method of performance evaluation compared to the traditional energy analysis. In this article, a review of the exergy analysis studies carried out in the field of thermal management of electric vehicles is conducted. Studies conducted on battery, electric motor, cabin and electronics have been considered. It is noted that most of the work is done on battery thermal management. The nature of the work, methods used, parameters varied and parameters evaluated are listed. It can be found that the amount of work carried out in this field is very much limited. Hence, the scope of future work is more and is described in the conclusions.
Highlights
With the advent of solar and wind energy becoming competitive with fossil fuels in matters of cost, the world is rising the standards are encouraging every country to aim at lowering CO2 emissions as well as pollution
One of the first to work on the exergy analysis of thermal management of electric vehicles (EVs) is the group of Hamut [5],[9]
Javani et al [10] have considered phase change materials for battery cooling, in addition to vapour compression system for cabin cooling. They carried out simulations involving amount of phase change material, evaporator and condenser temperature, compressor pressure and evaluated the performance of this cooling system by estimating the exergy efficiency, coefficient of performance (COP), emissions, sustainability, and optimized the cost
Summary
With the advent of solar and wind energy becoming competitive with fossil fuels in matters of cost, the world is rising the standards are encouraging every country to aim at lowering CO2 emissions as well as pollution. Many countries have set themselves an ambitious target of converting most of their road fleet from internal combustion engines to electric vehicles. This is made possible due to cheaper electric energy from renewable sources. The same applies to cooling processes which are basically heat exchange processes happening at finite temperature differences This brings about irreversibility, entropy generation and exergy loss. There have been several studies conducted on the effectiveness of cooling methods, mostly on EV batteries, followed by EV motors. They range from investigating an innovative cooling method, evaluating its effectiveness experimentally or by simulation or by both methods In all these studies, only energy analysis is carried out. A summary of the exergy studies is made and area where further study is needed is identified
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