How to configure a lab overlooking tubular heat exchanger to get data

HiI

In our undergraduate engineering chemical labboratory we want to configure our DAq with lab VIEW tubular heat exchanger to get information on the temperature (flow cold fluid warms up), (the steam pressure on the side of the hull of the heat exchanger) and flow (water warms up).

Can anyone suggest thermocouples, pressure transducers, and flow meters to stay between the heat exchanger and the acquisition of data?

P.S. the heat exchanger is already equipped with a pressure gauge, thermometers and a rotameter, but we do not know how to connect these devices to data acquisition

Looks like you have enough information to choose appropriate sensors, you just need to do the research. I start looking into Omega catalogue, or give them a call - they are generally useful. I can't take the time to spec parts for you - it would be a lot of time on another project. Most pressure sensors put a signal 4-20mA or 0 - 5V, that is which you can read through an analog input on a data acquisition; measure a 4-20mA signal requires a resistance to convert voltage. Most NI DAQ boards can read a thermocouple on an analog input, but make sure that your hardware is supported reading thermocouples. For an accurate reading, use a device that has the compensation of cold welding integrated - for example, the block connection SCB-68 - and for more accurate measurements, get a Board specifically designed to measure the temperature.

For measurement of the flow, a standard, simple solution is an orifice plate. You put a transducer for differential pressure across it, seek the appropriate equations and use them to calculate the flow rate given the density of the fluid (which you will be able to calculate from the pressure and the temperature, since the steam tables are widely available). Other differential pressure devices are available as well - at a previous job, we used a double cone of McCrometer. If you call them, they spec for you - but get an approximate cost first to make sure it's in your budget.

Tags: NI Software

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