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
Revision 0:11570780a596, committed 2015-04-30
- Comitter:
- takafuminaka
- Date:
- Thu Apr 30 16:47:28 2015 +0000
- Commit message:
- Initiali Release
Changed in this revision
VaporCondition.h | Show annotated file Show diff for this revision Revisions of this file |
VaporConditon.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/VaporCondition.h Thu Apr 30 16:47:28 2015 +0000 @@ -0,0 +1,39 @@ +/** + * 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 + */ + +#ifndef Vapor_Condition_H +#define Vapor_Condition_H + +#include "mbed.h" +#include "math.h" + +class VaporCondition +{ +public: + float t; // Temperature (degC) // + float h; // Relative Humidity (%) // + float p; // Air Pressure (hPa) // + + /* Saturated vapor pressure */ + float Pvsat(void); + float Pv(void); + float Rh(void); + float Tdp(void); + +private: +}; + + +#endif // Vapor_Condition_H + + \ No newline at end of file
--- /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); + } +} \ No newline at end of file