Man, your spelling is worse than minestill_stirrin wrote:This is examplified by Jacksonbrown's quote:s
That equation is only looking at the flow of heat in one in one direction. It doesn't really mater what the distillate temp is. Your right that it is a bit more complicated with phase changes and stuff when you can pull a heap of heat out of a fluid and it doesn't change temp but for what we're talking about I think that equation is fit for purpose IMO.still_stirrin wrote:Ideal efficiency is when the heat removed equals the heat introduced, or more appropriately the heat (flow) in the vapors is transfered to the coolant. This is examplified by Jacksonbrown's quote:
Therefore, the efficiency of the heat exchanger approaches 100% (ideal HEX). Note - in this equation, we're assuming the product outlet temperature is equal to the water inlet temperature.
Shouldn't that be a a larger deltaT requires less surface area? going back to my comment about making the smallest condenser.still_stirrin wrote: If there is a great difference between the water inlet temperature and the vapor inlet temperature, it may require more contact surface area to conduct the heat all out so that the product outlet temperature approaches the water inlet temperature.
Fact is, an efficient heat exchanger is one that exchanges heat efficiently. Plain and simple. Just because a lot of people interpret the term incorrectly doesn't make them right.
Correct and incorrect shouldn't really be up for a HD vote.
There are quite a few engineering terms that pop up here that are used in completely the wrong context but they seem to gain steam and become fixed.