Measuring the Temperature of Water Flowing Through a Pipe 1

[gustavosilvano]

Hello everyone.

I have a pyrometer and I want to measure the difference of temperature between the water that goes inside a machine and the water that get outside of it.

They're flowing through different pipes, so my idea is to measure the surface temperature of both pipes and with that get the delta T.

Can I do it using only a pyrometer? If not, is it possible to do it without buying a new instrument?

Best regards.

Gustavo

 

[1gibson]

Once, or continuously? Piece of black tape on the pipe and an infrared thermometer can do it once.

 

[IRstuff]

The radiometric surface temperature is a function of internal water temperature, pipe thermal conductivity, surface emissivity, and the heat transfer from the surface. Unless you know all the variables, you'd be much better off with sticking a regular thermometer in the water

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[SnTMan]

"pyrometer" means what?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[racookpe1978]

As IRStuff indicated, insert two thermowells with two regular thermocoupling indicators in the two pipes. Too many unknowns changing too often otherwise.

Also, your TC inserted into the water will measure a change in water temperature much faster than a sensor trying to measure the temperature on the outside of the pipe.

 

[Compositepro]

For a temporary measurement, a thermocouple on the outside of the pipe, wrapped with some fabric for insulation, should work fine.

 

[chicopee]

I would use thermocouples and conductive paste in a similar fashion to controls used on refrigeration equipment.

 

[LittleInch]

Depends how accurate you need to be.

If indeed a "pyrometer" is some sort of hand held IR gun then I would insulate the two pipes for say 500-1000mm as close to the machine as you can and then cut a small hole in it to get your surface measurement. Then create a plug to insert in the hole between each measurement.

If you can withstand 5% accuracy then you should be OK.



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[chicopee]

The type of pyrometer that I used when I worked in research was a hand held instrument which had to have intimate contact with the surface on which the temperature was to be measured. Not a very accurate way to measure surface temperatures however study the use of thermocouples used on refrigeration equipment in order to control the temperature of the refrigerant within the evaporator.