Interests in clean energy technologies have been growing in recent years especially for transportation, portable equipments as well as stationary power applications. Among the clean technology that gained high attention and investment to date is fuel cell, as a fuel cells is known to be able to produce electricity from a wide selection of fuels such as biogas, natural gas, propane, methanol, hydrogen as well as diesel. In order to contribute to the development of this particular clean energy, we review types of fuel cell particularly in transportation application to date and discuss the challenges for sustainable Fuel Cells Vehicles (FCVs) in future development. In this review paper, we also reviewed the development of FCVs of PEM and SOFC based, specifically. Although much progress has been done for PEM based vehicles thus far, the gas contamination is still a known bottleneck. As for SOFC, there is a lot more room to be improved in order to adopt this type of fuel cell in vehicle such as long time start-up time, insulation and heat dispersion. Nonetheless, SOFC has attained significant interests because it have zero emissions of pollutants to the environment and have high efficiency. Also, having high temperature operation offers many advantages, such as flexibility of using various fuels, high electrochemical reaction rate, and tolerance for impurities. In addition, using ceramics as its electrolyte can reduces the cost of manufacturing.

This study aims to investigate the feasibility of using a feedwater heaters system with coal-fired power plant. Furthermore, the influence evaluation of the different coal consumption on the coal-fired power plants in terms of power output and thermal efficiency improvements. As well, this study focuses on the effect of different feedwater heaters' numbers which caused the highest exergy destruction of the coal-fired power plants. For different values of the coal consumption, a parametric study was conducted to determine the efficiency of the coal-fired power plant. The results show that, when the coal consumption increases the power output will increases too. The slight decreases in the efficiencies are due to the small differences in how the mass flow rates of different streams increase. The exergy destruction was increased by about 16% when the consumption of fuel increases by 40 kg/s. It was observed that operating the coal-fired power plant at high coal consumption leads to reduce the effective ness of the feedwater heaters and increases the power output.