11-80E A single-pass crossflow heat exchanger is used to cool jacket water (c, = 1.0 Btu/lbm-°F) of a diesel engine from 190°F to 140°F, using air (c, = 0.245 Btu/lbm-°F) with an inlet temperature of 90°F. Both airflow and water flow are unmixed. If the water and air mass flow rates are 92,000 lbm/h and 400,000 lbm/h, respectively, determine the log mean tem- perature difference for this heat exchanger. Air flow (unmixed) 00 Water flow (unmixed)

11-80E A single-pass crossflow heat exchanger is used to cool jacket water (c, = 1.0 Btu/lbm-°F) of a diesel engine from 190°F to 140°F, using air (c, = 0.245 Btu/lbm-°F) with an inlet temperature of 90°F. Both airflow and water flow are unmixed. If the water and air mass flow rates are 92,000 lbm/h and 400,000 lbm/h, respectively, determine the log mean tem- perature difference for this heat exchanger. Air flow (unmixed) 00 Water flow (unmixed)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

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FIGURE P11-79
11-80E A single-pass crossflow heat exchanger is used
to cool jacket water (c, = 1.0 Btu/lbm-°F) of a diesel engine
from 190°F to 140°F, using air (c, = 0.245 Btu/lbm-°F) with
an inlet temperature of 90°F. Both airflow and water flow are
unmixed. If the water and air mass flow rates are 92,000 lbm/h
and 400,000 lbm/h, respectively, determine the log mean tem-
perature difference for this heat exchanger.
D
Air flow -
(unmixed)
Water flow
(unmixed)
X
FIGURE P11-80E
11-81 A single-pass crossflow heat exchanger with both flu-
ids unmixed has water entering at 16°C and exiting at 33°C.
while oil (c,= 1.93 kJ/kg-K and p=870 kg/m) flowing at
0.19 m³/min enters at 38°C and exits at 29°C. If the surface
area of the heat exchanger is 20 m² determine the value of the
f O
1
tu
e
11
th
ex
11
the
ex
11
the
flu
the
11-
rate
flo
ids
the
11-
excl
be f
11-
In o
is no
11-
exch
cold
3

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