The equation, which relates Number of Transferred Units to Universal Heat Transfer, will be used to determine the Universal Heat Transfer Coefficient of the current model.
is obtained by comparing the thermal capacity rate for the coolant and air.
The Mass Flow Rate for the coolant and air are:
The Thermal Capacity Rates for the coolant and air are:
Since
and
Next, we need to calculate the Number of Transfer Units of the original radiator assembly. To do this we for , and from the , and, respectively.
| (31) |
=
| (32) |
=
Using the , the value of can be found.
| (33) |
=
We can finally solve for by substituting the values of and in to the
=
Now that we have the value of , we can use the to determine the value for , which is equal to the value of .
Solving for the unknown values of and yields the following:
Finally at this point we can solve for the value of by substituting the values for , and into the
| (38) |
| (39) |