Physics Help Forum Modelling 2phased expansion valve
 User Name Remember Me? Password

 Advanced Thermodynamics Advanced Thermodynamics Physics Help Forum

 Jun 1st 2018, 01:01 PM #1 Junior Member   Join Date: Jun 2018 Location: Amsterdam Posts: 1 Modelling 2phased expansion valve Hello, I am currently trying to model a 2phased expansion valve in Simscape (matlab - simulink). They already have a Variable Local Restriction for a 2Phased model (https://nl.mathworks.com/help/physmo...riction2p.html) which I would like to use for my model. This Variable Local Restriction can calculate the Pressure drop of the Orifice according to its Throat Area. This is what I am also interested in to control.... If I determine what the desired pressure drop is then I would like to calculate the needed throat area to send as control signal to the Variable Local Restriction. However to calculate the Throat Area I will need to rewrite the Pressure Drop Eq (Capture1.png) and I will need to know the v_R (specific volume of the restricted area). I believe this value should come from the energy balance Eq (Capture2.png), but I only know the values of the A and B port (pressure, temperature, internal energy, specific volume, etc...). I don't know the pressure, internal energy or specific volume of the restricted area... So my question is, does any one know how the determine the Specific Volume of the Restricted Area of an Orifice when the Pressure and Temperature of the inlet and outlet are known? Attached Thumbnails

 Tags 2phased, expansion, modelling, orifice, specific volume, valve

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post fambros85 Thermodynamics and Fluid Mechanics 3 Feb 7th 2016 11:14 AM sonyantony Thermodynamics and Fluid Mechanics 0 Oct 5th 2015 10:49 PM skinns Energy and Work 0 Sep 6th 2015 04:49 PM jagi0018 Thermodynamics and Fluid Mechanics 0 Nov 19th 2014 12:19 PM summer Advanced Thermodynamics 1 Mar 31st 2014 05:16 AM