ME 354 Tutorial, Week#3
Application of the Second Law to an Open System
Two alternative systems are under consideration for bringing a stream of
air from 17C to 52C at an essentially constant pressure of 100 kPa.
System 1: The air temperature is increased
Homework Problems 4 Rankine Cycle
1) Consider a simple Rankine cycle using steam as the working fluid. Steam enters the turbine
at 10 MPa and 500C. The condenser operates at 10 kPa. Show the cycle on a T-s diagram.
Determine (a) the quality of the steam a
Homework Problems 7 Reacting Gas Mixtures
1) One kmol of ethane (C2H6) is burned with air. An analysis of the products shows that the
combustion was complete and that 2 kmol of O2 remains. Determine the air-fuel ratio and the
percent theoretical air used
Homework Problems 8 Psychrometrics
1) A sealed tank contains a gas mixture consisting of 21 kg of dry air and 0.3 kg of water vapour
at 30C and a total pressure of 100 kPa. Calculate the absolute humidity, the relative humidity
and the enthalpy of the mix
Homework Problems 2 Exergy
1) A well-insulated piston-cylinder assembly contains 30 liters of air at T1 = 27C and P1 = 120
kPa. The air is heated for 5 minutes using a 50 W resistance heater while the pressure is held
constant. How much exergy is destroye
Homework Problems 5 Gas Cycles
1) An ideal Otto cycle operates with r = 8. The compression stroke begins with T1 = 27C and P1
= 95 kPa. Combustion is represented by the addition of 750 kJ/kg of heat to the air in a
constant volume process. Determine (a) t
Homework Problems 3 Refrigeration
1) A refrigerator operates on an ideal vapour-compression cycle between 0.12 and 0.7 MPa. The
mass flow rate of refrigerant (R-134a) is 0.05 kg/sec. Calculate (a) the rate of heat removal
from the cold space (b) the rate
Homework Problems 6 Gas Mixtures
1) A gas mixture consists of 5 kg of O2, 8 kg of N2 and 10 kg of CO2. Determine the mass
fraction and mole fraction of each component. Also calculate the average molar mass and gas
constant of the mixture.
2) A gas mixture
Homework Problems 1 Review
1) Write the general 1st and 2nd law balances for a control mass. What do reversible, adiabatic,
isentropic, and steady processes do to these balances? Do this again for a control volume.
2) On a T-s diagram (Fig A-9), identify
ME 354 Tutorial, Week#8 IC Engines
The compression ratio in an air-standard Otto cycle is 10. At the
beginning of the compression stroke the pressure is 0.1 MPa and the
temperature is 15C. The heat transfer to the air per cycle is 1800 kJ/kg.
Determine:
a
ME 354 Tutorial, Week#2 Ideal Gas
Consider a rigid, insulated tank with a movable piston. Initially side A
contains 25kg of air at 250C and 500kPa, while side B contains 5kg of
air at 70C and 50kPa. The piston then moves to a new position where
the pressu
ME 354 Tutorial, Week#5 Refrigeration Cycle
A large refrigeration plant is to be maintained at -15oC, and it requires refrigeration at a
rate of 100 kW. The condenser of the plant is to be cooled by liquid water, which
experiences a temperature rise of 8o
ME 354 Tutorial, Week#11
Non-Reacting Mixtures Psychrometrics Applied to a Cooling Tower
Water exiting the condenser of a power plant at 45C enters a cooling tower with
a mass flow rate of 15000 kg/s. A stream of cooled water is returned to the
condenser
ME 354
THERMODYNAMICS 2
MIDTERM EXAMINATION
February 13, 2012
11:30 am - 1:30 pm
Instructor: R. Culham
Name:
Student ID Number:
Instructions
1. This is a 2 hour, closed-book examination.
2. Answer all questions in the space provided. If additional space i
ME 354
THERMODYNAMICS 2
MIDTERM EXAMINATION
February 14, 2011
5:30 pm - 7:30 pm
Instructor: R. Culham
Name:
Student ID Number:
Instructions
1. This is a 2 hour, closed-book examination.
2. Answer all questions in the space provided. If additional space is
ME 354 Tutorial, Week#13
Reacting Mixtures
Question 1:
Determine the mole fractions of the products of combustion when octane,
C8H18, is burned with 200% theoretical air. Also, determine the air-fuel
ratio and the dew-point temperature of the products if
ME 354 Tutorial #8
Non-Reacting Mixtures Ideal Gas Mixtures
An insulated tank that contains 1kg of O2 at 15C and 300kPa is connected to a
2m3 un-insulated tank that contains N2 at 50C and 500kPa. The valve
connecting the two tanks is opened, and the two g
ME 354 Tutorial, Week #10
Jet-Propulsion Cycle
A turbojet is flying with a velocity of 320 m/s at an altitude of 9150m,
where the ambient conditions are 32 kPa and -32C. The pressure ratio
across the compressor is 12, and the temperature at the turbine in
ME 354 THERMODYNAMICS - 2 08 April 2004 Final Examination R. Culham
This is a three-hour, closed-book examination. You are permitted to use one 8.5 in. 11 in. crib sheet. (both sides) and the Property Tables and Figures from Thermodynamics: An Engineerin
ME 354 Tutorial, Week#5 Rankine Cycle
Consider a coal-fired steam power plant that produces 300MW of electric power. The
power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5
MPa and 450oC and a condenser pressure of 25 k
ME 354 Tutorial, Week#4 Exergy: Control Mass Analysis
An insulated piston-cylinder device contains 2L of saturated liquid water at a pressure of
150 kPa - which is constant throughout the process. An electric resistance heater inside
the cylinder is turne