1, Calculate the exergy destroyed in the internal combustion device, the generat
ID: 2030670 • Letter: 1
Question
1, Calculate the exergy destroyed in the internal combustion device, the generator and the exhaust for Problem 1a. Identify the most significant exergy destruction term. What does this information suggest as energy usage design improvement?
For the following calculations consider the dead state to be 290 K, 1bar.
1b, Calculate the second law efficiency for the internal combustion device and generator system in Problem 1a.
1c. Calculate the exergy destroyed in the internal combustion device, the generator, the heat exchanger and the exhaust for Problem 1b. Identify the most significant exergy destruction term. What does this information suggest as energy usage design improvements and does it confirm your answer to question 1 above?
1d. Calculate the second law efficiency for the internal combustion device, heat exchanger and generator system in Problem 1b. Note that the exergy increase in the water flow is considered a desired output as well as the power produced.
ANSWER TO PROBLEM BELOW
lock , -Qing ttest added in C-C wWork done tr uarbine 5Sok -70-mh-225 7.8 | W- 550 550 rtD 32257 8 o-89- 6-28 2257-8 12. (3 300 -833 -oExplanation / Answer
It has been suggested to recover the waste from the exhaust of the internal combustion device described in question 1 above using a heat exchanger. The heat exchanger is an adiabatic device, there is no heat loss to the surroundings. A heat exchanger is a device that transfers heat from a hot fluid flow to a cold fluid flow, usually without mixing them. In this case the air flow will be used to heat a flow of water, 0.00134 Kg/s , that enters the device at a temperature of 290 K. The specific heat of the water is 4,120 J/(Kg K).
The performance of the heat exchanger is described by its effectiveness which is defined as the ratio of the actual heat transfe r rate to the maximum possible heat transfer rate.
Effectiveness = = qactual/((mc)minimum(Thot, in – Tcold,in)
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