2 a i ii b i a thin walled concentric tube heat exchanger has a unifor
A thin-walled concentric tube heat exchanger has a uniform overall heat transfer
coefficient, and operates under the following conditions in Table 1.
Mass flow Specific heat
Table 1: Heat exchanger conditions for question 2a.
Calculate the maximum possible heat transfer rate between the fluids,
describing fully the assumptions you must make.
Calculate the hot outlet temperature, assuming the heat exchanger operates in
the mode that maximises the heat transfer rate.
Write a chemical equation for the complete combustion of 1 kmol of cetane
(C16H34) in air assuming stoichiometric conditions. Take air to be 79%
nitrogen and 21% oxygen by volume.
5 kilomoles of pentane (CsH12) are burned completely in pure oxygen under
stoichiometric conditions with temperature and pressure being constantly
maintained at standard conditions of 25°C and 105 Pa respectively. Calculate
how much energy is available for external heating.
Enthalpies of formation are available in Table 2 and you may take the
chemical equation for the combustion of pentane to be
C5H12 +80₂5 CO₂ + 6H₂0
Enthalpy of Formation [kJ.kmol ¹]
Table 2: Enthalpy values for question 2b.
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