EXCEEDING MAXIMUM FLOW RATE
EXCEEDING MAXIMUM FLOW RATE
(OP)
ok so I have a plate to plate heat exchanger,
http://www.mcmaster.com/#35115k62/=wzpg0d
it lists the flow capacity at 6gpm. my question is what happens if i try using a 30l/min pump to push fluid through it? I guess for that matter what happens if you try to exceed the flow rate on a pipe in general?
http://www.mcmaster.com/#35115k62/=wzpg0d
it lists the flow capacity at 6gpm. my question is what happens if i try using a 30l/min pump to push fluid through it? I guess for that matter what happens if you try to exceed the flow rate on a pipe in general?





RE: EXCEEDING MAXIMUM FLOW RATE
It all depends on how the entire circuit looks like. If you can share a sketch, we can comment further.
Dejan IVANOVIC
Process Engineer, MSChE
RE: EXCEEDING MAXIMUM FLOW RATE
For the heat exchanger, it seems that it is made of stainless steel, so you probably will not have an erosion problem at your flow rate. The heat exchanger made not have enough heat transfer area to meet the guaranteed heat transfer performance requirements because the water is moving through too quickly.
RE: EXCEEDING MAXIMUM FLOW RATE
http://www.iwakiamerica.com/literature/md_wmd/IALT...
basically fluid coming into the pump and going through the heat exchanger then out again.
Here is a comparison heat exchanger that also can remove about 75000BTU/H and shows a 3psi pressure drop at 7.5gpm (28 l/min) (page 2).
http://www.brazetek.com/docs/pdf/brazed-plate-heat...
So now If I am trying to push fluid through at 40 l/min and the heat exchanger is rated for say 6gpm (23 l/min), what will happen??
RE: EXCEEDING MAXIMUM FLOW RATE
Dejan IVANOVIC
Process Engineer, MSChE
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
Pressure drop is proportional to the flow squared.
Dejan IVANOVIC
Process Engineer, MSChE
RE: EXCEEDING MAXIMUM FLOW RATE
∆T (F) = Change in temperatures between inlet and outlet of the fluid
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
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Mike Halloran
Pembroke Pines, FL, USA
RE: EXCEEDING MAXIMUM FLOW RATE
If the arrangement results in a air trap inside the HX on the cooling water side, then the pressure drop at 6gpm would be some higher unknown value. In order to setup the HX properly, you also need to know how the cooling water flows through the passes in this HX.
Which nozzles are used for cooling water, and which is inlet and outlet ?
What about the refrigerant glycol side ? That side will also need to be fully liquid primed. Do you not need to increase flow of glycol refrigerant glycol in tandem with cooling water flow ? In any case, the cooling duty will not be 2x that of the original design cooling duty, since the UA value for this HX is fixed.
If you increase flow from 22 litres/min to 44 litres/min on the CW side for this plate HX cooler, then exit cooling water will not be as cold as for the 22 litres / min case.
RE: EXCEEDING MAXIMUM FLOW RATE
RE: EXCEEDING MAXIMUM FLOW RATE
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Mike Halloran
Pembroke Pines, FL, USA