HW #4:
3.13 Complete Table 3-3 using the program PSYCH for (a) sea
level, (b) 5000 ft elevation; (c) compare parts (a) and (b)
Table 3-3 Psychrometric Properties
Dry
Bulb,F
Wet
Bulb,F
85
75
60
Humidity Enthalpy Relative
Mass
Ratio
i,
Humidity,% Density
W,
MECH4640
Aircraft Performance, Stability
and Control
5.
Equation of Motion
-Lecture 5-
2
Topics
Coordinate systems and their
transformations
Kinematic equations
Force equations
Moment equations
General EOM
-Lecture 5-
3
Coordinate System (CS)
Chord l
MOIST AIR PROPERTIES &
CONDITIONING PROCESSES
Psychrometrics
The surrounding air is a
mixture of dry air and
water vapor moist air;
Psychrometrics is a
subject of studying how
moist air behaves when
it is cooled or heated;
It is a tool to analyze
typic
Refrigeration
& Heat Pumps
T.S. Zhao, 2004
Introduction
T.S. Zhao, 2004
Refrigerator and Heat Pump
The objective of a refrigerator is to remove heat (QL) from the cold medium;
the objective of a heat pump is to supply heat (QH) to a warm medium.
Introdu
MECH4640
Aircraft Performance, Stability
and Control
Number of Students
N N 0e t
dN
1
N
t
N 0e
dt
Increase
Exponential function describes the
fraction of students that do not come to
the class anymore after a class.
To increase :
Soft way: interestin
General Introduction of Air
Conditioning Systems
Prof. T. S. Zhao
Dept. of Mechanical Engineering
HKUST
T.S. Zhao, 2004
Objectives
List environmental conditions that an air
conditioning system may control;
Describe where air conditioning is used;
Sketch
MECH4640
Aircraft Performance, Stability
and Control
6.
Static Stability
-Lecture 5-
2
Topics
Motivation and concept of Stability
Trim
Control Surfaces
Longitudinal Stability
Lateral Stability
The implication for aircraft design
-Lecture 5-
3
"The balanci
HW2
Additional Problem
Estimate the daily electricity cost ( in HK$) of 7 chillers at HKUST. Refrigeration
capacity of each chiller is 3517 kW and assume COP=3.7.
Solution:
The power input for each chiller
= Refrigeration capacity/ COP=3517/3.7=950.54 [kW
1. An aircraft is flying at 100 m/s at the altitude of 5 km on a standard day. Find the air speed at a
point on the wing where the static pressure is 0.055 MPa.
Solutions:
For aircraft fly at a certain altitude,
12
P C
2
At an attitude of 5km, refer to t
The flowing question problems are about a business jet with the following specifications:
W = 110 kN, S = 56 m2, CD0=0.02, K = 0.06, CLmax= 0.9 (no flaps) and 1.2 (flaps fully
deployed).
The drag polar equation CD=CD0 + K(CL)2 is applicable in any conditi
MECH4640
Aircraft Performance, Stability
and Control
Midterm Review
2
Briefing about midterm exam:
4 Multiple choices (15% each)
1 problem with 4 questions (10% each)
3
1. Speed problem:
1.1: What is airspeed?, What about headwind or tailwind
1.2: The uni
Tutorial2
NIEYuan
Rm1213,23588808
Taylorexpansion
f (x) =
n =0
f (n) (a)
(x a) n
n!
canhelpustosimplifytheresults
Airspeedfrompitotstaticsystem
1
p 3.5
1
V 2 = 3.5 p
p + 1 1
2
1
3.5
p
Soifwewanttoknowwhatthevalueofis,we
+ 1
p
set:
1
3.5
f (x) = (x
Topic 1
Engineering LawTopic 1Supplementary notes on
Corporate Law
Types of Business Organizations
1.
Unincorporated organizations
2.
Incorporated organizations
Unincorporated
Legal status
No of members
Liabilities
Succession
Raise of capital
Ownership of
The flowing question problems are about a kg executive jet with the following specifications:
Total mass = 4536 kg, S = 18.5 m2, CD0=0.02, K = 0.05, CLmax= 1.2,
The sea-level thrust T = 9 kN
The drag polar equation CD=CD0 + K(CL)2 is applicable in any con