Heat Exchanger - Shell and Tube Type

Steel.

I need Medium 1 to be used in Tube Side or Shell Side.

I dont want MOC.

It's only water, so what's the problem?

Yes Both side the medium is water.

My question is

7Deg. C to 12 Deg. C to be used in tube side

OR

25Deg. C to 19 Deg. C to be used in tube side.

My product is at 25Deg. C which has to cooled to 19Deg. C

FOR the same i am using cool water of 7Deg. C which will gain heat and attain a temp. of 12 Deg. C.

It doesn't matter.

ok.

But if we plan to mount the heat exchanger vertical then the same conditions are applicable.

Well, you didn't say, did you?

Exactly. The key piece of information was missing. It doesn't matter thermally which fluid goes which side, though it might matter mechanically. It took a bit of digging to get that out, didn't it!

Agree, in your case it won't matter; what should be the detemining factor is the cleanliness of the water - place the dirtier water in the tubes because they are more easily cleaned.

Although he won't achieve heat exchange with those two fluids. How can a hot fluid be used to chill a cool one?

It doesn't add up.

The answer is put the medium 2 in tube-side: The explanation was given on 03/30/2009 at the link: http://cr4.globalspec.com/thread/35657/Fluids-in-Shell-and-Tube-Side.

This is like the old question "Which is correct English; 'The yolk of an egg is white' or 'The yolk of an egg are white'?" Answer - neither; the yolk of an egg is yellow.

Save some money, stop worrying, and use a plate & frame heat exchanger.

rjc

There are serveral points:

1) fouling resistance of these two mediums: normally high fouling fluid should be on tube side.

2) mechanical consideration: Design pressure & Design tempreture Usally put higher DP&DT on tube side.

3)exchanger oritention: horizontal or vertical?

oritention is vertical.

Dear Mr. shekhar,

Temp is not the only factor to choose shell side and tube side, it also depends on the design pressure. If ur design pressure of medium 1 is higher then it should be on tube side only because if u will consider high pressure fluid on shell side then it will increase the cost of exchanger as u have to construct a large dia shell.

t=PR/SE-0.6P

there are various other factors , based upon then u can decide which fluid on tube side and which one on shell side like corrosion, fouling, velocity, dirty fluids etc.

Hi

Counter or Parallel flow - check the NTU relationship. NTU = number of thermal units exchanged. Parallel will be closer to 0.66-0.70 and counter closer to 1.0.

why not tube in tube with removable ends ? - you can clean it quickly.

make it a split one eg 10 x tubes / side. Easy to manufacture and cheaper.

Hi,

Your primary side and secondary side temperature differences are small and nearly equal therefore nearly equal volmes will be present on both sides therefore given the modest MTD (12.5K) there appears to be a case for using a Plate Heat Exchanger (PHE) instead. You do not mention the quantity of heat to be transferred between the media but in general and given the situation I suggest that the most cost effective solution would be a PHE. As a rule of thumb the shell and tube calorifiers are popular with large delta T applications with MTDs of say 50K+and high pressure differences between the media. The higher temperature medium which would usually be cooling through the greater amount would be passed through the tubes whilst the larger volume and typically lower pressure would pass thru' the shell.

PHEs are extremely cheap and have a smaller approach temperature difference therefore benefiting the application. Conact SWEP, Spirax Sarco ,Tranter or BSS for further help and free design/sizing help.