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Δh 0.0003T 2 1.8038T 42.152 (4.10) (4.11) (4.12) Δh 0.0001T 2 exh 1.0048T exh N2 Δh 0.0001T 2 exh 22.907 0.918T 24.316 H2O exh exh exh O2 Using equations (4.9-4.12) and the exhaust temperature from Table 4-1 of 429.22°C, the change in enthalpy for CO2, H2O, N2, and O2 are 398.74 kJ kg-1, 787.34 kJ kg-1, 427.39 kJ kg-1, and 388.13 kJ kg-1, respectively. The total exhaust heat transfer was then found as follows: Q m m MF Δh MF Δh MF Δh MF Δh (4.13) exh fuel air CO2 CO2 H2O H2O N2 N2 O2 O2 Using the values calculated previously, the total exhaust heat loss for the representative point is 6.73 kW. 4.1.5 Unburned Hydrocarbons Combustion is never 100% efficient in an engine and some fuel energy is always lost through unburned fuel exiting the exhaust. This unburned fuel can be measured using a 5-gas analyzer with the result reported as total hydrocarbon (THC) present. The THC measurement is dependent on the hydrocarbon used to calibrate the equipment. The 5-gas analyzer at the EECL was calibrated using methane (CH4), so the reported quantity of hydrocarbons present in the exhaust must be converted to the appropriate fuel to accurately calculate the energy lost. The rate of energy loss in the exhaust due to uncombusted fuel is calculated as follows: E 12mfuel LHVfuel CTHC (4.14) THC CCC THC CO CO2 The 12 in the numerator refers to the number of carbon atoms in typical a diesel fuel molecule, m is the mass flow rate of diesel fuel, LHV is the lower heating value of diesel fuel (43.2 MJ fuel fuel kg-1), MW fuel is the molecular weight of diesel fuel (167.31 kg kmol-1), C is the CO CO 63PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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