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value, the secondary coolant pump was turned on to allow the secondary cooling system temperature to rise. As the HTF temperature reached within 10°C of the target temperature, the secondary cooling system fan was activated. Finally, the HTF target temperature was achieved by adjusting the HTF flow rate, secondary coolant flow rate, and the heat exchanger bypass. These adjustments were also used to fine tune the temperature difference across the engine to approximately 10°C. The oil system took significantly longer to reach operating temperature than the cooling system. Rather than adjusting the oil system to reach a set temperature, adjustments were made to ensure 275.8 kPa of oil pressure and a minimum temperature increase across the engine of at least 10°C. The logging of experimental data was initiated only after the relevant temperatures had stabilized to steady state. To assist in the determination of steady state, two minute averages of the key temperatures were displayed on the host VI. The real-time temperatures were compared to these values, and steady state was assumed when the differences between the real time and average temperatures were sufficiently small (< 0.1°C). Once steady state was reached, occasional adjustments to the cooling system were required to prevent the HTF temperature from drifting more than 1°C from the target temperature. These small adjustments were typically made using the heat exchanger bypass valve. Data logging was activated after steady state was reached and adequate temperature differences across the engine were verified. Data was logged at a rate of 2 Hz for the period of time in minutes that was entered into the VI. The length of the data logging period was determined from the estimated fuel usage at the given load condition. Accurate fuel flow calculations using the starting and ending fuel weights required a long enough run to reduce the error in the difference of the weights to approximately 1%. Initially, a scale with an accuracy of ±0.02 kg was used to 54PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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