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What is the most efficient and cleanest fuel that could be developed for…

- - - - Are triglycerides extracted from plants
        
        Varying levels of viscosity
        
        Non polar
        
        High heat release
        
        Can undergo hydrogenation to decrease melting point
        
        Can undergo hydrolysis, separating into fatty acids and glycerol
        
        Combustion products: CO2 + H2O
      - Biofuels
    - - Highly flammable
        
        Non polar
        
        Mostly liquid at room temp (vapourises easily)
        
        Heat release (Ethanol): ~29 kJ/g
        
        Combustion Products: CO2 + H2O
    - - Solid
        
        Variety of form factors (woodchips, solid wood etc.)
        
        Different types of softwoods & hardwoods have different thermal masses and heat release (~18 kJ/g)
        
        Readily available & requires little minimal processing
        
        Combustion products: mainly CO2 + H2O
    - - Solid
        
        Flammable
        
        Heat release: ~18-25 kJ/g
        
        Combustion Products: CO2 + H2O
    - - Variable levels of flammability
        
        Wet fibres do not burn easily
        
        Unknown heat release
        
        Can be used as wicks etc. using capillary action