zerok,
Thanks. From your results, Chevron angles and gap thickness have dramatic influence on HTC. A well designed PHE will require only a 1/3 of a less well designed PHE. Are the above HTCs based on a pressure drop limit of around 0.6bar at the cold side?
I am surprised how little I know...
zerok,
Sorry that data in 3. are all PHE overall dimensions which will be probably irrelevant to the plate dimensions you required for your using the software. Again, the manufacturers did not provide all plate dimensions, except the plate thickness.
The cold side has a high HTC and the hot...
zerok,
Thanks for trying to help. In response to your previous thread, the followings are data provided by the plate manufacturer:
1. Chevron angle: Manufacturers did not provide, pls assume the best and worst scenario.
2. Plates gap: Manufacturers did not provide, pls assume a common gap...
RMW,
The manufacturers will not provide this chevron angle.
You are correct that the above example was comparing apple to apple since the loads are different, the frame sizes are different. In the above example, it does not make sense to have same design conditions, almost same pressure...
RMW,
The PHE data from one of the manufacturer are as follows:
PHE1
Hot Cold
Flow 27012 54317 kg/h
Pressure drop 0.2 0.61 Bar
Specific Heat Capacity 4.212 4.189 kJ/kg/c
Thermal conductivity 0.678 0.664
Load...
Thanks for the reply.
I have assumed water specific heat capacity to be 4.18 through out. You are right if you were talking about differences in specific heat capacities of water at different temperatures. The differences in load is trivial, say less than 5% when compared with what the...
Your question is a bit too general. You need to be more specific on what you have done, such as establishing if the instrumentations are correct (installation, calibration etc.). At low flow, what are the operating conditions, such as steam flows, pressures, temperatures, and desuperheating...
The equation put into words: cold side Mass flow x Specific energy x temperature difference of cold side liquid = hot side mass flow x specific engy of hot side liquid x temperature difference of hot side liquid.
If you are considering Plate Type Heat Exchanger, you may like to take a look this thread:
http://www.eng-tips.com/viewthread.cfm?qid=118735&page=1
The thread did not give any specific answers but could contribute to your recall of memory:
Heat transferred Q = U x A x LMTD
where U = Overall...
"dissolved O2" is not a good indicator of air leaks. If cooling water is running normal, the only thing that could cause high back pressure is air leak.
Good luck to your search for identifying your condenser problem.
Though you said you have checked all air leaks, from my experience, its likely a vacuum leak at most unlikely locations. Check also LP feed heater flash box drain.
I am asked to propose small biomass combined heat & power plants for councillors and investors. There are already small number of power plants (in California and Hawaii) built based on the Kalina Cycle. I would appreciate any hands on operational experiences feedbacks on proposing this type of...
