Problem 4.10
In a heat exchanger for two different fluids, power expenditure per heating surface area is to be
calculated. Fluids flow through the channels of the heat exchanger. Hydraulic diameter of the
channel is 0.0241 m.
a. For air at an average temp
A.G. Yazcolu
ME 421 Fall 2006
Problem 9.2
Air enters the core of a finned-tube (aluminum) HEX of the type shown in Fig. 9.4 at 2 atm and
150oC. The air mass flow rate is 10 kg/s and flows perpendicular to the tubes. The core is 0.5 m
long with a 0.30 m2 f
Problem 9.9
An air-to-water compact heat exchanger is to be designed to serve as an intercooler in a gas
turbine plant. Geometrical details of the proposed surface (surface 9.29-0.737-S-R) for the air side
is given in Fig. 9.8 and in Table 9.1. Hot air at
armfield
LAMINAR FLOW TABLE
C10
issue 11
The Armfield Laminar Flow Table has been designed to simulate ideal fluid flow and
give clear visualisation of the flow patterns created using water as the working fluid.
This enables a comprehensive investigation
SEMBOLLER
Ac
cp
CF
di
do
De
Dh
Di
f
hi
ho
ID
k
L
mc
mh
Nu
OD
OS
Q
Pr
Re
Rfi
Rfo
Rft
t
Tb
Tc
Th
U
ua
ui
p
Pa
Pi
T
Tlm,cf
Is deitiricisinde akkann getii kesit alan (m2)
Sabit basntaki spesifik s (J/kg. K)
Temizlik faktr
ksmdaki borunun i ap (m)
ksmdaki bo
Problem 4.8
Assume that the tube bundle arrangement given in Problem 3.11 is the core of a heat
exchanger. Calculate the pressure drop caused by the tubes for in-line and staggered
arrangements, and compare the two pressure drops and the two pumping power
Problem 4.9
In a crossflow heat exchanger with in-line tubes, air flows across a bundle of tubes at
5oC and is heated to 32 oC. The inlet velocity of air is 15 m/s. Dimensions of tubes are:
do=25 mm, Xt=Xl=50 mm. There are 20 rows in the flow direction an
F.MH.FAK. MAKNA MH. BL.
MM342 MAKNA DNAM 1. VZE SORU ZMLER
Cevap 1.
a)
F = ma = 0
v = 0
a=0
Statik denge
v = sbt Dinamik denge
b) DAlembert Prensibi: Bir sisteme etkiyen atalet kuvvetleri d kuvvetler ile birlikte dnldnde
cisim btn bu kuvvetlerin etkisi
MM498 THERMAL SYSTEM DESIGN
HOMEWORK #3
(Due on April 27 2011)
1) Data about the cost of high pressure PVC pipe are given below. Fit this data to a curve in the form of
Cp=C1Dn (Find C1 and n).
Nominal diameter in Cost per meter ($/m)
inches
4
2.48
8
6.53
MM498 ISIL SSTEM TASARIMI PROJE KONULARI
1) Atk suyun ssn kullanan amar makinesi tasarm
2) Ev tipi buzdolab iin kondenser tasarm
3) Ev tipi buzdolab soutma sisteminin simlasyonu
4) Gne enerjisi ile stlan havuz tasarm
5) Teras buzlanmasn nleme sistemi tasa
GAZ UNIVERSITY
Faculty of Engineering and Architecture
Mechanical Engineering Department
MM 498E THERMAL SYSTEM DESIGN
FORMULLER
Modified Bernoulli equation
Roughness number
Total pipe cost
Ro
p1 g c V12
pg
V2
fL V 2
V2
z1 2 c 2 z 2
K
g
2g
g
2g
Dh 2 g
Problem 9.1
Air at 1 atm and 400 K and with a velocity of 10 m/s flows across the compact heat exchanger
shown in Fig. 9.6 A, and exits with a mean temperature of 300 K. The core is 0.6 m long.
Calculate the total frictional pressure drop between the air