Changeset 372 for trunk/eml/pressure_changers/pump.mso

Timestamp:

Sep 21, 2007, 7:17:36 PM (16 years ago)

Author:

Argimiro Resende Secchi

Message:

Adding pressure drop variable (Pdrop) and pressure ratio (Pratio) in some models. Need to do the same for other models.

File:

• trunk/eml/pressure_changers/pump.mso (modified) (3 diffs)

trunk/eml/pressure_changers/pump.mso

@@ -54 +54 @@
         BPower    as power                      (Brief = "Brake Power");
         EPower    as power                      (Brief = "Eletrical Potency");
-        Pdiff     as press_delta        (Brief = "Pressure Increase", DisplayUnit='kPa');
-        Pratio    as positive           (Brief = "Pressure Ratio");     
+        Pratio    as positive           (Brief = "Pressure Ratio", Symbol ="P_{ratio}");        
+        Pdrop     as press_delta        (Brief = "Pressure Drop", DisplayUnit = 'kPa', Symbol ="\Delta P");
         Head      as head                       (Brief = "Head Developed"); 
         Head_is   as head                       (Brief = "Isoentripic Head"); 
@@ -90 +90 @@
         vm = PP.LiquidVolume(Inlet.T,Inlet.P,Inlet.z);
         
-        #Mass and Energy Balance and Pump Equations     
-        "Calculate Outlet Stream Pressure"
-        Outlet.P = Inlet.P + Pdiff;
-        
-        "Pratio Definition"
+        "Pressure Ratio"
         Outlet.P = Inlet.P * Pratio;
-        
+
+        "Pressure Drop"
+        Outlet.P  = Inlet.P - Pdrop;
+
         "Calculate Isentropic Head"
-        Head_is = Pdiff * Mwm/rho;
+        Head_is = -Pdrop * Mwm/rho;
 
         "Calculate Real Head"
@@ -116 +115 @@
         
         "Calculate Outlet Temperature"
-        (Outlet.T - Inlet.T) * Cp = (Outlet.h - Inlet.h) -  Pdiff * Mwm / rho * (1 - Beta * Inlet.T);
+        (Outlet.T - Inlet.T) * Cp = (Outlet.h - Inlet.h) + Pdrop * Mwm / rho * (1 - Beta * Inlet.T);
         
         "Molar Balance"