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EEPQ 2245 Tutorial One New

This document contains a tutorial for the Chemical Process Energy Balances course, presenting four problems related to energy calculations in chemical processes. The problems involve calculating power output from a gasoline engine, changes in kinetic energy of air in a pipe, energy changes in methane flow, and specific enthalpy of helium. Each problem requires application of thermodynamic principles and ideal gas behavior.

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8 views1 page

EEPQ 2245 Tutorial One New

This document contains a tutorial for the Chemical Process Energy Balances course, presenting four problems related to energy calculations in chemical processes. The problems involve calculating power output from a gasoline engine, changes in kinetic energy of air in a pipe, energy changes in methane flow, and specific enthalpy of helium. Each problem requires application of thermodynamic principles and ideal gas behavior.

Uploaded by

reagannjeri
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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DEPARTMENT OF CHEMICAL AND PROCESS ENGINEERING

EMCQ 2245/EMCI 2246: Chemical Process Energy Balances

TUTORIAL NO. 1

Problem 1.1

A certain gasoline engine has an efficiency of 30%; that is, it converts into useful work 30% of the
heat generated by burning a fuel. If the engine consumes 0.80L/h of a gasoline with a heating
value of 3.5×104 kJ/L, how much power does it provide? Express the answer both in kW and
horsepower.

Problem 1.2

Air at 300°C and 130 kPa flows through a horizontal 7-cm ID pipe at a velocity of 42.0 m/s.

(a) Calculate rate of change in Kinetic Energy in J/s, assuming ideal gas behavior.
(b) If the air is heated to 400°C at constant pressure, what is the rate of change in kinetic
energy (J/s) from 300 oC to 400 oC?

Problem 1.3

Methane enters a 3-cm ID pipe at 30°C and 10 bar with an average velocity of 5.00 m/s and
emerges at a point 200 m lower than the inlet at 30°C and 9 bar. Calculate ∆𝐸̇𝑘 and ∆𝐸̇𝑝 (W)
assuming that the methane behaves as an ideal gas.

Problem 1.4

The specific internal energy of helium at 300K and 1 atm is 3800 J/mol, and the specific molar
volume at the same temperature and pressure is 24.63 L/mol. Calculate the specific enthalpy of
helium at this temperature and pressure, and the rate at which enthalpy is transported by a
stream of helium at 300 K and 1 atm with a molar flow rate of 250 kmol/h.

Dr. Bilha Eshton,

2025

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