PHE Inspection

"All plate heat exchangers look similar on the outside. The difference lies on the inside, in the details of the plate design and the sealing technologies used. Hence, when evaluating a plate heat exchanger, it is very important not only to explore the details of the product being supplied, but also to analyze the level of research and development carried out by the manufacturer and the post-commissioning service and spare parts availability.

An important aspect to take into account when evaluating a heat exchanger are the forms of corrugation within the heat exchanger. There are two types: intermating and chevron corrugations. In general, greater heat transfer enhancement is produced from chevrons for a given increase in pressure drop and are more commonly used than intermating corrugations."

You must know the proper gasket material for the fluid and temperature you are working with...Additionally you must understand the design of the plates in the particular heat exchanger you are using, as the design will directly impact the rate of heat transfer...With this information you can determine the flow rate necessary for proper processing...

http://en.wikipedia.org/wiki/Plate_heat_exchanger

Thank U mr,Solar,

what fluid can i determine of flow rate, is coolant fluid or fluid be cooled??

in heat transfer equation Q = UA∆Tm, where U is the overall heat transfer coefficient, "A" is the total plate area, and "∆Tm" is the temperature difference.SO, have'nt influence of flow rate in there..please explain, it hard to me for know ;-D

As fluid goes through it, it will change its temperature. The flowrate and the temperature are interdependent, Captain.

∆Tm is the log-mean temperature difference between the four ports on the exchanger.

Don't forget

Q = m * cp * ΔT (m should be mass rate, cp is specific heat)

Assuming no change of state

In PHE the most important area for inspection is the flatness of plates, NDT of plates before assembly, support groove of gasket in all the gasketting area, perfect fitting of gasket with proper adhesive. During stacking of plates, care shall be taken to avoid damaging any edge of the gaskets.

These practicale care gives quite good results with the PHEs.

Good morning ALL, :-D,

and thank U for all of your response,it is so nice for me and i will do that, hehe...