Hello, I want to compute MFR (mass flow rate) of refrigerant... From the frequency of compressor. It can easily compute.... So please provide solution if you have...
Hello Hemantchandra,
This is rather hard to estimate. If you know the displacement of the compressor, and the density of the refrigerant upstream of the compressor, then you indeed can know the volume (and hence mass) pumped per second.
The trick is in estimating the density of the upstream refrigerant.
You could add a mass-flow sensor (I like Sensirion's SFM range) upstream, build a model of mass-flow vs. rotation rate, and use that for fixed temperature situations. But that model wouldn't be portable to other refrigerators.
It will be very difficult to estimate the MFR with frequency. Even if you know the dimensions of the compressor, MFR will vary for the same rpm with respect to intake pressure (degree of super heat). As mentioned by Mr James Garry, estimating the density of the refrigerant is a challenge. You need some sensors like Flow sensor and Pressure sensor to accurately calculate the flow rate of refrigerant.
Thank you very much Mr. James Garry and Mr. Ramesh kumar for the expert guidance... Coriolis flow meter is the accurate solution...but the cost is too much as well as not competeble in hose pipes of car air conditioning... I have also quoted for gear flow meter... but, in that case calebration issue... however, I am trying to find other way in economical experimental method... Specifications required as follows: 1) It's G 1/4" thread operating connections
2) measuring flow range: 0.17-20 Liter/Min.
3) Fluid: Refrigerant R-134a
4) Output: 4-20mA
5) Display: LCD display (Not mandatory)
6) operating pressure: 0 to 25 bar
Suggest if any other sensor except coriolis flow meter and gear flow meter... Turbine flow meter can also solve the problem, but, the calibration issue sustainibility with 25 bar pressure
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