Results 1 to 50 of 82
Threaded View
-
28-09-2009, 10:44 AM #11
Re: Air-driven evaporators - stability issues
desA your coming up with some dramatic new revelations in heat transfer and fluid flow!
First is it possible you can explain the two axis on your graph, as they are calculated you should also include the original formulae. You have previously introduced the alpha and beta coefficients but are they the same in the plot you have posted.
I have not come across a curve like this but have seen heat transfer coefficients change during changes in the flow regime, these are almost parrallel but offset and can cause jumps in the evap condition. These curves are always sloping in the same direction leading to stabliity assuming all alse is industry standard. The flow can jump from one line to another but they always have a positive slope.
Many years ago there was a paper that purported a mythical negative pressure slope where an increase in flow reduced the pressure drop, an interesting concept but it has never been shown in experimental data.
You also mention that evaps are non linear in their behaviour, well condensers, compressors, pressure drops in pipes and TXV's are all non linear but it does not mean they can't be modelled or understood.
Looking forward to graph details.
Chef
Similar Threads
-
1 Tev 2 Evaporators
By Renato RR in forum Technical DiscussionsReplies: 14Last Post: 18-11-2009, 02:58 PM -
Thumb rule for belt driven compressor - Power loss
By smpsmp45 in forum NH3Replies: 4Last Post: 27-09-2007, 09:26 AM -
multiple evaporators
By billthomas in forum Technical SpeculationsReplies: 27Last Post: 06-06-2007, 07:13 PM -
Flooded & Pump Evaporators
By MrReds in forum FundamentalsReplies: 2Last Post: 24-01-2007, 06:29 PM -
Liquid line for multi evaporators
By Kevin Yeo in forum Supermarket RefrigerationReplies: 1Last Post: 29-12-2005, 02:29 PM