2011 International Conference on Alternative Energy in Developing Countries and Emerging Economies
- 131 -
n
number of channels
Nu Nusselt number
Pr
Prandtl number,
/
p
Pr C k
P
Q
heat transfer rate (kW)
q''
heat flux (kW/m
2
)
Re
Reynolds number,
/
Re Gd
P
T
temperature (˚C)
U
overall heat transfer coefficient (W/m K)
Subscripts
avg
average
exp
experimental
in
inlet
l
local
out
outlet
rec
rectangular
s
surface
w
water
A variety of studies can be found in the literature for
the investigations of single-phase heat transfer
characteristics in minichannels and microchannels. In this
work, the heating plate at the top-side is used to supply
heat flux to the cold water side or multiport minichannel
side. Therefore, the results from this work are quite
different from the previous works. The other main finding
from this work is the comparison of the experimental
results with the classical method.
Flow Meter
Condensing unit
Water Pump
Cold water tank
Test section
Valve
Valve
Valve
220V
20
๐
C
temp
35
๐
C
temp
Testo logger
220 VAC
Data logger
Computer
Control board
5 A
35 V
on
off
DC pawer supply
Fig. 1. Schematic diagram of the experimental apparatus.
