diff --git a/src/specificClass.js b/src/specificClass.js
index 7653a41..ef679e9 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -1,6 +1,6 @@
 const EventEmitter = require('events');
-const {loadCurve,logger,configUtils,configManager,state, nrmse, MeasurementContainer, predict, interpolation , childRegistrationUtils} = require('generalFunctions');
-const { name } = require('../../generalFunctions/src/convert/lodash/lodash._shimkeys');
+const {loadCurve,gravity,logger,configUtils,configManager,state, nrmse, MeasurementContainer, predict, interpolation , childRegistrationUtils,coolprop} = require('generalFunctions');
+const pressure = require('../../generalFunctions/src/convert/definitions/pressure');
 
 class Machine {
 
@@ -84,9 +84,21 @@ class Machine {
       this._updateState();
     });
 
+
+    //perform init for certain values
+    this._init();
+
     this.child = {}; // object to hold child information so we know on what to subscribe
     this.childRegistrationUtils = new childRegistrationUtils(this); // Child registration utility
 
+
+  }
+
+  _init(){
+    //assume standard temperature is 20degrees
+    this.measurements.type('temperature').variant('measured').position('atEquipment').value(15).unit('C');
+    //assume standard atm pressure is at sea level
+    this.measurements.type('atmPressure').variant('measured').position('atEquipment').value(101325).unit('Pa');
   }
 
   _updateState(){
@@ -670,15 +682,36 @@ _callMeasurementHandler(measurementType, value, position, context) {
     return { cPower, cFlow };
   }
 
-  calcEfficiency(power, flow, variant) {
+  calcEfficiency(power,flow,variant) {
+
+    const pressureDiff = this.measurements.type('pressure').variant('measured').difference('Pa');
+    const g = gravity.getStandardGravity();
+    const temp = this.measurements.type('temperature').variant('measured').position('atEquipment').getCurrentValue('K');
+    const atmPressure = this.measurements.type('atmPressure').variant('measured').position('atEquipment').getCurrentValue('Pa');    
+    const rho = coolprop.PropsSI('D', 'T', temp, 'P', atmPressure, 'WasteWater');
+    
+
+    this.logger.debug(`temp: ${temp} atmPressure : ${atmPressure} rho : ${rho} pressureDiff: ${pressureDiff?.value || 0}`);
+    const flowM3s = this.measurements.type('flow').variant('predicted').position('atEquipment').getCurrentValue('m3/s');
+    const powerWatt = this.measurements.type('power').variant('predicted').position('atEquipment').getCurrentValue('W');
+    this.logger.debug(`Flow : ${flowM3s} power: ${powerWatt}`);
 
     if (power != 0 && flow != 0) {
-      // Calculate efficiency after measurements update
-      this.measurements.type("efficiency").variant(variant).position('atEquipment').value((flow / power));
-    } else {
-      this.measurements.type("efficiency").variant(variant).position('atEquipment').value(null);
-    }
+      const specificFlow = flow / power;
+      const specificEnergyConsumption = power / flow;
 
+      this.measurements.type("efficiency").variant(variant).position('atEquipment').value(specificFlow);
+      this.measurements.type("specificEnergyConsumption").variant(variant).position('atEquipment').value(specificEnergyConsumption);
+    
+      if(pressureDiff?.value != null && flowM3s != null && powerWatt != null){
+        const meterPerBar = pressureDiff.value / rho * g;
+        const nHydraulicEfficiency = rho * g * flowM3s * (pressureDiff.value * meterPerBar ) / powerWatt;
+        this.measurements.type("nHydraulicEfficiency").variant(variant).position('atEquipment').value(nHydraulicEfficiency);
+      }
+    
+    } 
+
+    //change this to nhydrefficiency ? 
     return this.measurements.type("efficiency").variant(variant).position('atEquipment').getCurrentValue();
 
   }
@@ -768,8 +801,8 @@ _callMeasurementHandler(measurementType, value, position, context) {
 module.exports = Machine;
 
 /*-------------------               Testing               -------------------*/
-/*
 
+/*
 curve = require('C:/Users/zn375/.node-red/public/fallbackData.json');
 
 //import a child