ME430 Air Conditioning
Quiz # 1
Tuesday 14-10-2003
Fall Semester 031 Duration 20 minutes
Name:
ID # :
Serial #:
The dry bulb and wet bulb temperatures are measured to be 78 o
F and 65 o
F, respectively in an air duct with a volumetric flow rate of 4000 cfm. This air is cooled to 50 o
F and 90
% relative humidity.
Compute the total heat transfer rate
Compute the sensible heat transfer rate
Compute SHF
ME 430 Air conditioning
Term 031
Make up quiz
Name:
ID #
Air is cooled from 75 F db and 70 F wb until it is saturated at 55 F. Find: a. The moisture removed per lb of dry air b. The heat removed to condense the moisture. c. The sensible heat removed d. The total amount of heat removed

KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
MECHANICAL ENGINEERING DEPARTMENT
ME 430-01 AIR CONDITIONING
FIRST MAJOR EXAM
SUNDAY 2 nd
NOVEMBER, 2003.
TERM 031
STUDENT NAME:
ID #
SERIAL #
DURATION: 90 Minutes
CLOSED BOOK / CLOSED NOTES
Problem # Mark Earned Grade
Total
1
2
3
10
15
25
50
The exam has 5 pages including the cover page
%

1.
i. What is meant by: a. All Air System b. Air and Water system c. Dual Duct system, Is it recommended to be used, why? d. What is meant by heat recovery. Why are heat recovery systems recommended for use whenever possible? e. Off Design Conditions. What might occur when the load on a VAV system decreases? (A sketch on psychrometric chart can be used) ii. What is the main difference between a dual duct system and a multizone system?
2.
A meeting hall is to be maintained at 25 C db and 18 C wb. The barometric pressure is 101.3 kPa. The space has a load of 58.6 kW sensible and 58.6 kW latent. The temperature of the supply air to the space cannot be lower than 18 C db. a.
How many kg/s of air must be supplied? b.
What is the required wet bulb temperature of the supply air? c.
What is the sensible heat ratio?
3.
An auditorium has a calculated cooling load of 10 tons of which 2.5 tons is latent load. The space is to be maintained at 76 F db and 50 % RH. Ten percent by volume of the air supplied to the space is outdoor air at 100 F db and 50% RH.
The air supplied ot the space can not be less than 56 F db. Assume sea level conditions. Find: a.
The minimum amount of air supplied to the space in cfm. b.
The amounts of return air and outdoor air in cfm. c.
The conditions and volume flow rate of the air entering the cooling coil. d.
The capacity and SHF for the cooling coil.
Additional sheet for problem 3.

KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
MECHANICAL ENGINEERING DEPARTMENT
ME 430-01 Air Conditioning
SECOND MAJOR EXAM
SUNDAY 21 st
December, 2003.
TERM 031
STUDENT NAME:
ID #
SERIAL #
DURATION: 90 Minutes
CLOSED BOOK / CLOSED NOTES
Problem # Mark Earned Grade
1
2
10
12
Total
3
4
18
20
60
The exam has 5 pages including the cover page
%

Problem # 1
A constant air volume system having a filter located in location A of the figure and a filter efficiency of 70% for environmental tobacco smoke (ETS) is to be used to assist in holding the particulate level of the ETS in an occupied zone below 220
 g/m 3 . Assume that an average occupant (including smokers and nonsmokers) produces about 125
 g/min of ETS, and that 20 cfm of outdoor air per person is to be supplied. For a ventilation effectiveness of 0.65 for the space, determine the necessary rate of recirculation assuming no ETS in the incoming outdoor air.
Problem # 2
A filter system to handle 5600 cfm of air is to be designed using M-2A media and the
12x24x8 modules. The lost pressure must be 0.10 in wg. or less when the filters are clean.
How many modules are required?
Problem # 3
A system requires a flow rate of 210 gpm and a head of 120 ft.
1.
Select a pump from the figure that most closely matches the required flow rate and head, and list its shaft power and efficiency.
2.
Suppose a 7 in., 3500 rpm pump was selected for the system. At what flow rate and head would the system operate, assuming no adjustments? Find the efficiency and power.
3.
If the system of part (b) is adjusted to a flow rate of 210 gpm. What are the efficiency and power?
Problem # 4
Size the piping for the cooling tower open circuit shown in Figure. Water flow rate is
0.03 m
3
/s, and the total equivalent length of the pipe is 200 m. The pressure loss for the condenser coil is 35 kPa, and the strainer has a C vs
of 1.14x10-2 m3.s per kPa pressure loss.
What is the head requirement for the pump.
Figure

ME430 Air Conditioning
Quiz # 2
Tuesday 16-12-2003
Student name
ID #
Time: 20 minutes
A smoking area in a factory is designed for 75 people. Design a filter and air-circulation system whereby the outdoor air rate can be reduced to 15 cfm/person. Outdoor and recirculated air should be mixed before filtering. Outdoor air contaminants are negligible.
The filter media must have a gravimetric efficiency of about 80 % in the 0-5x10
-3
mm particle range, and the pressure loss must not exceed 0.10 in. water Refer to Table 4-6.
ME430
Make up quiz
Name
ID #
What is the lost pressure for an 18*18 in duct discharging into a large plenum? The flow rate is 4500 cfm, and the duct expansion ratio Ao/A1 is 4.0. a.
Assume an abrupt entrance b.
Assume a 20 degree transition exists at the entrance to the plenum.
ME430 Air Conditioning
Quiz # 3
January 3, 2004
Name
ID#
Serial #
A circular metal duct 20 ft in length has abrupt contraction at the inlet and abrupt expansion at the exit. Both have area ratio of 0.6. The duct has a diameter of 10 inch with a flow rate of 600 cfm. Estimate the loss in total pressure for the duct including the contraction and expansion.

KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS
MECHANICAL ENGINEERING DEPARTMENT
ME 430-01 Air Conditioning
FINAL EXAM
WEDNESDAY, January 07, 2004
STUDENT NAME:
ID #
TERM 031
SERIAL #
DURATION: 2½ HOURS
OPEN BOOK EXAM
Problem # Mark Earned Grade
1 20
Total
2
3
4
20
20
20
80
The exam has 5 pages including the cover page
%

Problem # 1
An auditorium has a calculated cooling load of 410 kW with SHF = 0.756. The space is maintained at 25 o
C db and

= 50 %. Outdoor air isat 38 o
C and

= 50 %. Ten percent
(by mass) of the air supplied to the space is outdoor air. Air to be supplied to the space at not less than 18 o
C. Assume sea level pressure.
Calculate the minimum amount of air supplied to the space in m 3 /s
Calculate the volume flow rate of return air, exhaust air and outdoor air.
Find the condition and volume flow rate of the air entering the cooling coil
Find the capacity, apparatus dew point, bypass factor and SHF of the cooling coil.
Problem # 2 a.
A smoking area in a factory is designed for 75 persons. Design a filter system whereby the outdoor air rate can be reduced to 15 cfm/person. Outdoor air and re- circulated air should be mixed before filtering. Outdoor air contaminants are negligible. The filter media must have a gravimetric efficiency of 80 %in the 0-
5*10 -3 mm particle range and the pressure loss should not exceed 0.10 in. water.
First find the recommended outdoor air requirement per person. b.
The condensers for a centrifugal chiller plant require 200 gpm with water entering at 85F and leaving at 100 F; the outdoor ambient air wet bulb temperature is 76F.
1.
Select a suitable cooling tower
2.
Compute the cooling range, approach and the tower capacity.
Problem 3
Size the pipe for the water circuit shown in figure. The pipe is of type L copper. The lengths given are total equivalent lengths excluding the coil and control valves. Select a pump for this system. Note that the longest run is 123451.

Problem # 4
Compute the loss n total pressure for each run of the duct system shown in figure. The ducts are of round cross section. Turns and fittings are shown.
Assume abrupt entrance, pleated elbows and 45 o branch. Use equivalent length method.