What is the adiabatic flame temperature (aft) of a stoichiometric acetylene (c2h2)-o2 flame? what is the heat of reaction? what assumptions go into the aft calculation? assume constant specific heats at 298 k.

Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method