Radiator Signature
Engine
heat rejection @ peak power w/auto trans.
|
5400
BTU/min
|
Ambient
temperature
|
100
 F Grade with trailer |
Air
temperature into radiator
|
100F (no heat pick up)
|
Air
temperature out of radiator (fan blast)
|
194 F AC fan and radiator
will be retained for short term radiator out temperature rise
|
Coolant
temperature into radiator (top tank)
|
245 F Grade with trailer
|
Coolant
temperature out of radiator (bottom tank)
|
223 F
|
Radiator
type
|
Cross
flow, tube and spacer, brazed
|
Radiator
dimensions and aspect ratio
|
28’’w
x 20’’h core x 0.80 deep. AR=28/20=1.4
|
Radiator
frontal area
|
3.9
ft2
|
Fins
per inch and spacer height
|
21
FPI, louvered, 0.340’’ spacer height
|
Material
|
Al,
tubes, fins & tube sheets, 50% glass filled nylon tanks
|
Required
front end air flow
|
280
lbs/min into radiator=3889 ft3/min
|
Air
velocity across radiator
|
1029
ft/min
|
Radiator
effectiveness
|
65%
based on air side
|
LMTD,
log mean temperature difference
|
82 F (assume cross flow
air and coolant)
|
Pump
coolant flow @ 4320 pump RPM
|
325
lbs/min
|
Coolant
velocity through individual tubes
|
6.1
ft/sec
|
Uo
overall heat transfer coefficient
|
35BTU/F
|
Inside
heat transfer coefficient
|
1231 BTU/F
|
Outside
heat transfer coefficient
|
44 BTU/F
|
Air
side pressure drop
|
0.65’’
water
|
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