Raya University
College of engineering and technology
Department of mechanical engineering
4th Year (Thermal stream)
Project 1 (30%)
Air distribution duct design
Block in Raya University has four rooms each room requires the following conditioned air to
maintain the rooms in comfort zone. The sketch and volume flow rate is given below.
ROOM 1
ROOM 2
Mechanical Room
ROOM 3
ROOM 4
Room 1 =0.2407 m3 /s , Room 2 =0.1577 m3 /s . Room 3 =0.2158 m3 /s. Room 4 =0.1826 m3 /s
Using those inputs and reasonable assumptions design the duct work (duct length, duct loss and
elbow loss)
Prepared by: Mebrahtu k.
Submission date
July 18/11/2015EC
Project 2 (40%)
Shell and Tube heat exchanger
1. Design shell and tube heat exchanger for the cooling of 100 computers. This is done through a
heat exchanger whereby liquid propylene flows through the supercomputer circuit. Heat is
rejected by the computers to the propylene. The propylene is then cooled using chilled water
through a designed heat exchanger. The aim of this project is to design a heat exchanger fit to
serve the specifications provided. The flow rate of liquid propylene from each super computer is
given to be 40kg/hr while the flow rate of cooling water available to the heat exchanger is 10 000
kg/hr. Liquid propylene exits the supercomputers at a temperature of 27°C it is then cooled
through the heat exchanger to a temperature of 15°C where it is recycled to the supercomputers.
The cooling water is maintained at 5°C as entrance temperature to the heat exchanger.
2. 20000kg/h of kerosene leaves the base of kerosene side-stripping column at 200 oc
and is to be cooled to 90 oc by exchange with 70000kg/h light crude oil coming from
storage at 40 oc. The kerosene inters the heat exchanger at a pressure of 5 bar and the crude oil at
6.5 bar. Pressures drop of 0.8bar the maximum permissible on both the streams, including
nozzle losses. Assuming a pressure drop of 0.1bar for shell inlet and outlets and similarly for
tube inlet and outlet nozzles. Allowance should be made for fouling by including a fouling factor
of 0.00035(Wm -2k-1)-1 for the crude stream and 0.0002(Wm -2k-1)-1 for the kerosene stream.