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  1. askerix

    wireless flow measurement. GPRS

    Thank you for the response. It´s more than 2000 foot. More like 2000 miles, therfore I would like to use something like GPRS
  2. askerix

    wireless flow measurement. GPRS

    What do you guys use to get a live wireless flow measurement? I need to have a live monitoring of the mass/volume flow of some CNG so that the caretaker can monitor the flow from internet. It would be preferable to send signals with gprs and messure flow and temperature with a vortex device...
  3. askerix

    compressed biogas expansion temperature drop heating

    It varies a bit, but I guess it is appropriate to assume that there is 2% Co2 and 1%N2. No water, very small amounts of ammonia and CO. the flow is quite small; about 105nm3/h. nonemetric it´s like 66 scfh ?
  4. askerix

    compressed biogas expansion temperature drop heating

    The pressure regulator works like most pressure regulators, where the fluid is doing work on a spring. Why do my general isentropic equations differ with 40K from "the rule of thumb"? Do I have to use CFD-analysis of each regulator to get the exact temperature drop? However, thank you for...
  5. askerix

    compressed biogas expansion temperature drop heating

    I have been given the task of making an installation expanding biogas(97% CH4) from 200 down to 4 bar. Is it sufficient to calculate the temperature drop with the standard isentropic equation V1/V2=(P1/P2)^k-1/k? I´m in doubt because I once heard that CNG(ca 94%CH4) drops approximately 1...
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