Index: firmware/App/Modes/ModeGenDialysate.c
===================================================================
diff -u -r67731d57db9a620418b3b848d8f75ff204902c36 -r4b09605126f35b80406e95d079f3822c51a3ba25
--- firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision 67731d57db9a620418b3b848d8f75ff204902c36)
+++ firmware/App/Modes/ModeGenDialysate.c	(.../ModeGenDialysate.c)	(revision 4b09605126f35b80406e95d079f3822c51a3ba25)
@@ -52,6 +52,12 @@
 #define DIALYSATE_TEMP_UPPER_SAFETY_LIMIT_C             42.0F                                       ///< Dialysate upper bound safety temperature limit in C.
 #define DIALYSATE_TEMP_LOWER_SAFETY_LIMIT_C             33.0F                                       ///< Dialysate lower bound safety temperature limit in C.
 #define DIALYSATE_TEMP_CLEAR_TIMEOUT_MS                 ( 10 * MS_PER_SECOND )                      ///< Dialysate temperature clear persistence timeout.
+#define QUAD_FIRST_COEFFICIENT                          0.0006F                                     ///< First coefficient used in adjusted dialysate temperature quadratic calculation for low Qds
+#define QUAD_SECOND_COEFFICIENT                         -0.1743F                                    ///< Second coefficient used in adjusted dialysate temperature quadratic calculation for low Qds
+#define QUAD_THIRD_COEFFICIENT                          17.3F                                       ///< Third coefficient used in adjusted dialysate temperature quadratic calculation for low Qds
+#define LINEAR_SLOPE_FACTOR                             -0.0029F                                    ///< Slope factor used in adjusted dialysate temperature linear calculation for high Qds
+#define LINEAR_INTERCEPT_FACTOR                         3.47F                                       ///< Intercept factor used in adjusted dialysate temperature linear calculation for high Qds
+#define LOW_DIAL_FLOW_RATE                              150.0F                                      ///< Dialysate flow rate lesser than 150 considered to be low Qds.
 
 //Testing
 #define DELAY_BC_SWITCHING_AT_START_UP          ( 3 * MS_PER_SECOND )                               ///< Provide a balancing chamber switching start up delay to stabilize pump speed etc.,
@@ -84,6 +90,7 @@
 static DD_GEND_MODE_STATE_T handleGenDDialysateIsolatedUFState( void );
 static F32 getGenDialysateTargetTemperature( void );
 static void checkDialysateTemperature( void );
+static void calculateTargetDialysateTemp( void );
 static void publishGenDialysateModeData( void );
 
 /*********************************************************************//**
@@ -191,7 +198,8 @@
             //Previous state
             setValveState( DD_M4_VALV, VALVE_STATE_OPEN );
             // Get the target temperature from TD
-            targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+            //targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+            calculateTargetDialysateTemp();
             // Turn on the primary heater
             setHeaterTargetTemperature( D5_HEAT, getGenDialysateTargetTemperature() );
             startHeater( D5_HEAT );
@@ -217,7 +225,8 @@
             //Previous state
             setValveState( DD_M4_VALV, VALVE_STATE_OPEN );
             // Get the target temperature from TD
-            targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+            //targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+            calculateTargetDialysateTemp();
             setHeaterTargetTemperature( D5_HEAT, getGenDialysateTargetTemperature() );
             startHeater( D5_HEAT );
             setValveState( D14_VALV, VALVE_STATE_OPEN );
@@ -368,6 +377,37 @@
 
 /*********************************************************************//**
  * @brief
+ * The calculateTargetDialysateTemp function calculate the delta temperature
+ * required for dialysate temperature to meet the set temperature at dialyzer.
+ * @details \b Inputs: Qd and target temperature.
+ * @details \b Outputs: Adjusted Target temperature
+ * @return none.
+ *************************************************************************/
+static void calculateTargetDialysateTemp( void )
+{
+    // Get the dialysate flow rate from TD
+    F32 dialFlowrate = getTDDialysateFlowrate();
+    F32 deltaTemp    = 0.0F;
+
+    if ( dialFlowrate >= LOW_DIAL_FLOW_RATE )
+    {
+        //  linear releationship seen against high dialysate flowrate Vs DeltaTemp
+        //  deltaTemp = (-0.0029 * Qd) + 3.47
+        deltaTemp = ( LINEAR_SLOPE_FACTOR * dialFlowrate ) + LINEAR_INTERCEPT_FACTOR;
+    }
+    else
+    {
+        // deltaTemp = (0.0006 * Qd * Qd)-(0.1743*Qd) + 17.3
+        deltaTemp = ( QUAD_FIRST_COEFFICIENT * dialFlowrate * dialFlowrate ) +
+                    ( QUAD_SECOND_COEFFICIENT * dialFlowrate ) + QUAD_THIRD_COEFFICIENT;
+    }
+
+    // Adjust the D4 target temperature
+    targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature() + deltaTemp;
+}
+
+/*********************************************************************//**
+ * @brief
  * The handleGenDDialysateIsolatedUFState function performs the
  * Isolated ultrafiltration operations.
  * @details \b Inputs: none.
@@ -535,7 +575,11 @@
         updateBalChamberSwitchingPeriod();
 
         // Get the target temperature from TD
-        targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+        //targetHydChamberFluidTemp.data = getTDTargetDialysateTemperature();
+        calculateTargetDialysateTemp();
+        //Reset flag
+        signaltoResetAdjustedTargetTemp( D5_HEAT );
+
         // Update the target temperature for heater control
         setHeaterTargetTemperature( D5_HEAT, getGenDialysateTargetTemperature() );