diff --git a/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java b/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
index d0dd22fbc6293b0a5d1ddd341838cdc0102fd184..6127dc68951966c0d19730d05b3bb84c9b9ea094 100644
--- a/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
+++ b/tree-water-demand/src/main/java/de/hft/stuttgart/water/TreeWaterDemand.java
@@ -95,8 +95,8 @@ public class TreeWaterDemand {
 				// convert to MJ/h - 1 W = 0.0036 MJ/h
 				incomingRadiation *= 0.0036;
 				double windSpeed = Double.parseDouble(row[windSpeedIndex]);
-				double saturationVaporPressure = e0(temp);
-				double actualVaporPressure = ea(saturationVaporPressure, humidity);
+				double saturationVaporPressure = saturationVaporPressure(temp);
+				double actualVaporPressure = actualVaporPressure(saturationVaporPressure, humidity);
 				int dayOfYear = counter.getDayOfYear();
 				double hourOfDay = counter.getHour() + 0.5;
 				double et0 = et0(temp, actualVaporPressure, incomingRadiation, height, windSpeed, humidity, dayOfYear,
@@ -111,8 +111,6 @@ public class TreeWaterDemand {
 				bw.write(String.format(";%.3f", et0u));
 
 				et0s.add(et0);
-				// System.out.println("et0: " + et0);
-				// System.out.println("etia: " + etia);
 				et0us.add(et0u);
 				counter = counter.plusHours(1);
 				bw.write("\n");
@@ -136,9 +134,8 @@ public class TreeWaterDemand {
 			demands.add(etia);
 		}
 
-		System.out
-				.println(
-						"Summe aller ETIa: " + demands.stream().collect(Collectors.summingDouble(Double::doubleValue)));
+		System.out.println(
+				"Summe aller ETIa: " + demands.stream().collect(Collectors.summingDouble(Double::doubleValue)));
 
 	}
 
@@ -155,22 +152,22 @@ public class TreeWaterDemand {
 
 	private static double et0(double temperature, double actualVaporPressure, double shortWaveRadiation, double height,
 			double windSpeed, double humidity, int dayOfYear, double hourOfDay, double lz, double lm) {
-		double nominalRadiation = rn(temperature, actualVaporPressure, shortWaveRadiation, height, dayOfYear, hourOfDay,
+		double netRadiation = rn(temperature, actualVaporPressure, shortWaveRadiation, height, dayOfYear, hourOfDay,
 				lz, lm);
 		double gamma = gamma(height);
-		double saturationVaporPressure = e0(temperature);
+		double saturationVaporPressure = saturationVaporPressure(temperature);
 		double delta = delta(temperature, saturationVaporPressure);
-		double g = g(nominalRadiation, shortWaveRadiation > 0);
-		double n = 0.408 * delta * (nominalRadiation - g)
+		double g = g(netRadiation, shortWaveRadiation > 0);
+		double n = 0.408 * delta * (netRadiation - g)
 				+ gamma * (37 / (temperature + 273)) * windSpeed * (saturationVaporPressure - actualVaporPressure);
 		return n / (delta + gamma * (1 + 0.34 * windSpeed));
 	}
 
-	private static double ea(double saturationVaporPressure, double humidity) {
+	private static double actualVaporPressure(double saturationVaporPressure, double humidity) {
 		return saturationVaporPressure * humidity / 100;
 	}
 
-	private static double e0(double temperature) {
+	private static double saturationVaporPressure(double temperature) {
 		return 0.6108 * Math.exp((17.27 * temperature) / (temperature + 237.3));
 	}
 
@@ -179,11 +176,11 @@ public class TreeWaterDemand {
 		return 0.665 * 0.001 * pressure;
 	}
 
-	private static double g(double nominalRadiation, boolean daylight) {
+	private static double g(double netRadiation, boolean daylight) {
 		if (daylight) {
-			return 0.1 * nominalRadiation;
+			return 0.1 * netRadiation;
 		} else {
-			return 0.5 * nominalRadiation;
+			return 0.5 * netRadiation;
 		}
 	}