ECE309 INTRODUCTION TO THERMODYNAMICS & HEAT TRANSFER 16 June 2004 Midterm Examination R. Culham
This is a 90 minute, closed-book examination. You are permitted to use one 8.5 in. 11 in. crib sheet (
ECE309 Introduction to Thermodynamics and Heat Transfer
Tutorial # 11
Radiation Heat Transfer
Problem 1 Two parallel disks of diameter D=0.6m separated by L=0.4m are located
directly on top of each ot
Forced Convection
ECE309 Introduction to Thermodynamics and Heat Transfer
Tutorial 9
Question
A truck, pulling a refrigerated trailer, travels at 105
km/hr. Solar radiation heats the roof of the truck
ECE309 Introduction to Thermodynamics and Heat Transfer
Tutorial # 7
Steady State Conduction
Problem 1
Consider a naked person standing in a room at 20C with an exposed
surface area of 1.7m2. The deep
ECE309
Thermodynamics & Heat Transfer
Quiz #1:
Name:
ID #:
Problem: An amusement park at the bottom of Niagara Falls wants to install a
water turbine to produce 100 kW of power. Water (assumed to be i
ECE309
Thermodynamics & Heat Transfer
Name:
Quiz #3:
ID #:
=1
2.
1
cm
H=
?
W
L=18 cm
Problem: A 12.1 cm wide and 18 cm high vertical
hot surface in 25 C air is to be cooled by an
aluminum heat sink (k
ECE 309
Introduction to Thermodynamics and Heat Transfer
Tutorial # 2
Properties of Pure Substances
Problem 1
Complete the following table for substance water:
a.
b.
c.
d.
P [kPa]
500
500
1400
T [oC]
ECE309
Thermodynamics & Heat Transfer
Name:
Quiz #2:
ID #:
The composite wall of an oven consists of three materials, two of which are of known thermal conductivity, kA = 20 W/m K and kC = 50 W/m K, a
ECE309 Introduction to Thermodynamics and Heat Transfer
Tutorial #3
First Law of Thermodynamics: Closed Systems
Problem 3-73 A 0.3-m3 tank contains oxygen initially at 100kPa and 27C. A paddle
wheel w
Thermodynamics and Heat transfer ECE 309 Tutorial 5# The Second law of Thermodynamics Problem 1 A gas turbine has an efficiency of 17 percent and develops a
power output of 6000 kW . Determine the fue
ECE 309
Introduction to Thermodynamics and Heat Transfer
Tutorial # 6
Entropy
Problem 1
Air is compressed steadily by a 5-kW compressor from 100 kPa and 17oC to 600 kPa and
167oC at a rate of 1.6 kg/m
ECE 309
Introduction to Thermodynamics and Heat Transfer
Tutorial # 10
Natural Convection
Problem Consider a 15 cm 20 cm printed circuit board (PCB) that has electronic
components on one side. The boa
ECE 309
Heat Transfer & Thermodynamics
Tutorial # 8
Transient Heat Conduction
_
Problem 1: A long aluminium cylinder 50 mm in diameter [k=215 W/(mC), = 2700 kg/m3 ,
Cp = 0.9 kJ/(kgC), and = 8.4 10-5 m
ECE-309
Heat Transfer & Thermodynamics
Tutorial # 12
Radiation heat transfer-exchanged between surfaces
Problem 1: A furnace cavity, which is in the form of a cylinder of 75 -mm diameter and 150-mm
le