HVAC · Heat-Transfer · Problem 17
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HVAC · Heat-Transfer · Problem 17
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Problem: Cold water initially at 55 degrees is heated to 120 degrees to make potable hot water using a parallel flow, shell and tube heating stanger.
Given: 500 GPM delta T it's the product of the volume flow rate and the delta T that determine how much he is actually being...
Approach: So this is the path that the cold water takes it starts off at 55 and then it heats up considerably 220 and then the LTHW which...
Key formula: formula for log mean temperature difference you can write L M T D or you can write delta T sub L M equals delta T A m...
Calc: Remember it's 500 GPM delta T it's the product of the volume flow rate and the delta T that determine how much he is actually b...
Result: So 105 minus 10 in the numerator and the denominator of the units will cancel L M 105 over 10 it's a 0.06 and that difference equals 40.4.
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