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  1. #1
    Join Date
    Mar 2016
    Location
    IRAN
    Posts
    182
    Rep Power
    9

    Pressure = Function of (T)

    Dear Friends,
    By some application such as refrigerant slider [photo at below] we can obtain pressure of refrigerant when we have temperature of it (and vice versa) in saturation area.
    Also same as this, In drive of electronic expansion valves we have same as this matter and drive by measuring suction pressure can realize evp. Temperature and finally obtain superheat.

    Definitely these applications and devices use a formula and function such as :
    Pressure = Function of (T).

    Suppose I want to program a SIMENS MINI PLC that measure pressure of suction and suction temp. then by using a function can understand evp. Temperature and then obtain superheat to open or close electronic expansion valve.

    Definitely these devices or softwares do not use table, They use a formula to obtain temperature or pressure on saturation area.

    I need this formula or function for different refrigerants. Have you ever seen these formulas on any sources ?

    photo_2018-05-12_21-47-23.jpg



    Sincerely yours.
    Last edited by A.Mortezania; 12-05-2018 at 06:25 PM.

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