Nakatafu ☆
VaporConditions : Vepor related calculation library / 水蒸気関係の各種計算用ライブラリ Library for Calculate some vapor related values from Temperature, Relative Humidity and Air Pressure 温度、相対湿度、大気圧から水蒸気関係のいくつかの値を計算します。 The formulas are based on 計算式は以下を参考にしています。 http://www.mistral.co.jp/kestrel-japan/MistralHumiRatio.pdf http://www.kanomax.co.jp/img_data/file_731_1417598330.pdf
Dependents: Condensation_Monitor BLE_Condensation_Monitor
Diff: VaporConditon.cpp
- Revision:
- 0:11570780a596
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/VaporConditon.cpp Thu Apr 30 16:47:28 2015 +0000
@@ -0,0 +1,52 @@
+/**
+ * VaporConditions Vepor related calculation library
+ *
+ * @author Takafumi Naka
+ * @version 1.0
+ * @date 30-Apr-2015
+ *
+ * Library for Calculate some vapor related values from Temperature, Relative Humidity and Air Pressure
+ * The formulas are based on
+ * http://www.mistral.co.jp/kestrel-japan/MistralHumiRatio.pdf
+ * http://www.kanomax.co.jp/img_data/file_731_1417598330.pdf
+ */
+
+#include "mbed.h"
+#include "math.h"
+#include "VaporCondition.h"
+
+// Saturated Vapor Pressure (hPa) //
+float VaporCondition::Pvsat()
+{
+ return (6.11*pow(10,7.5*t/(t+237.3)));
+}
+
+// Vapor Pressure (hPa) //
+float VaporCondition::Pv()
+{
+ return (Pvsat()*h/100.);
+}
+
+// Humidity Ratio (g/kg) //
+float VaporCondition::Rh()
+{
+ return (6.22*Pv()*100/p);
+}
+
+// Dew Point Temperature //
+float VaporCondition::Tdp()
+{
+ float y,y2,y3,y4;
+ y = log(Pv()*100/611.213);
+ y2 = y*y;
+ y3 = y2*y;
+ y4 = y2*y2;
+ if ( y>=0 )
+ {
+ return (13.715 * y+ 8.4262e-1 * y2 +1.9048e-2 * y3 +7.8158e-3 * y4);
+ }
+ else
+ {
+ return (13.7204 * y +7.36631e-1 * y2 +3.32136e-2 * y3 +7.78591e-3 * y4);
+ }
+}
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