Changeset 152

Timestamp:

Feb 6, 2007, 3:57:49 PM (15 years ago)

Author:

nubinha

Message:

Change in valve equations

File:

• trunk/eml/pressure_changers/valve.mso (modified) (4 diffs)

trunk/eml/pressure_changers/valve.mso

@@ -54 +54 @@
         
         SET
-        rho60F = 999.2  * "kg/m^3";
+        rho60F = 999.02 * "kg/m^3";
         
         EQUATIONS
@@ -105 +105 @@
 Model valve_parabolic as valve_basic
 
-        PARAMETERS
-        n               as positive (Brief = "Constant", Lower = 1.4, Upper = 2.6);
-
-        VARIABLES
-        x               as fraction (Brief = "Opening");
-        
-        EQUATIONS
-        
-        "Opening Equation"
-        fc = x^n;
+        
+        VARIABLES
+        x               as fraction (Brief = "Opening");
+        
+        EQUATIONS
+        
+        "Opening Equation"
+        fc = x^2;
 
 end
@@ -120 +118 @@
 Model valve_equal as valve_basic
 
-        PARAMETERS
-        a               as Real (Brief = "Constant", Default = 100);
-
-        VARIABLES
-        x               as fraction (Brief = "Opening");
-
-        EQUATIONS
-        
-        "Opening Equation"
-        fc = a^(x-1);
+        
+        VARIABLES
+        x               as fraction (Brief = "Opening");
+
+        EQUATIONS
+        
+        "Opening Equation"
+        fc = x^2/(2-x^4)^(1/2);
 
 end
@@ -135 +131 @@
 Model valve_quick as valve_basic
 
-        PARAMETERS
-        a               as positive     (Brief = "Constant", Default = 0.05);
-        n               as positive (Brief = "Constant", Default = 5);
-
-        VARIABLES
-        x               as fraction (Brief = "Opening");
-
-        EQUATIONS
-        
-        "Opening Equation"
-        fc = (1-(a*(1-x)-(a-1)*(1-x)^n));
+        
+        VARIABLES
+        x               as fraction (Brief = "Opening");
+
+        EQUATIONS
+        
+        "Opening Equation"
+        fc = 10*x/sqrt(1+99*x^2);
 
 end