ppetru/opensprinkler-weather
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Change radiation units to kWh

Browse Source
This commit is contained in:
Matthew Oslan
2019-06-18 10:46:51 -04:00
parent 009fa90ec8
commit f68a981257
2 changed files with 37 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
routes/adjustmentMethods/EToAdjustmentMethod.ts
View File

@@ -74,6 +74,8 @@ export function calculateETo( etoData: EToData, elevation: number, coordinates:
elevation = elevation / 3.281;
// Convert to meters per second.
const windSpeed = etoData.windSpeed / 2.237;
// Convert to megajoules.
const solarRadiation = etoData.solarRadiation * 3.6;
const avgTemp = ( maxTemp + minTemp ) / 2;
@@ -111,8 +113,6 @@ export function calculateETo( etoData: EToData, elevation: number, coordinates:
const clearSkyRadiation = ( 0.75 + 2e-5 * elevation ) * extraterrestrialRadiation;
const solarRadiation = etoData.solarRadiation;
const netShortWaveRadiation = ( 1 - 0.23 ) * solarRadiation;
const netOutgoingLongWaveRadiation = 4.903e-9 * ( Math.pow( maxTemp + 273.16, 4 ) + Math.pow( minTemp + 273.16, 4 ) ) / 2 * ( 0.34 - 0.14 * Math.sqrt( actualVaporPressure ) ) * ( 1.35 * solarRadiation / clearSkyRadiation - 0.35);
@@ -149,7 +149,7 @@ SunCalc.addTime( Math.asin( 30 / 990 ) * 180 / Math.PI, "radiationStart", "radia
* http://www.shodor.org/os411/courses/_master/tools/calculators/solarrad/
* @param cloudCoverInfo Information about the cloud coverage for several periods that span the entire day.
* @param coordinates The coordinates of the location the data is from.
* @return The total solar radiation for the day (in megajoules per square meter per day).
* @return The total solar radiation for the day (in kilowatt hours per square meter per day).
*/
export function approximateSolarRadiation(cloudCoverInfo: CloudCoverInfo[], coordinates: GeoCoordinates ): number {
return cloudCoverInfo.reduce( ( total, window: CloudCoverInfo ) => {
@@ -172,8 +172,8 @@ export function approximateSolarRadiation(cloudCoverInfo: CloudCoverInfo[], coor
const endPosition = SunCalc.getPosition( endTime.toDate(), coordinates[ 0 ], coordinates[ 1 ] );
const solarElevationAngle = ( startPosition.altitude + endPosition.altitude ) / 2;
// Calculate radiation and convert from watts to megajoules.
const clearSkyIsolation = ( 990 * Math.sin( solarElevationAngle ) - 30 ) * 0.0036 * windowLength;
// Calculate radiation and convert from watts to kilowatts.
const clearSkyIsolation = ( 990 * Math.sin( solarElevationAngle ) - 30 ) / 1000 * windowLength;
return total + clearSkyIsolation * ( 1 - 0.75 * Math.pow( window.cloudCover, 3.4 ) );
}, 0 );
@@ -212,7 +212,7 @@ export interface EToData {
minHumidity: number;
/** The maximum relative humidity over the time period (as a percentage). */
maxHumidity: number;
/** The solar radiation, accounting for cloud coverage (in megajoules per square meter per day). */
/** The solar radiation, accounting for cloud coverage (in kilowatt hours per square meter per day). */
solarRadiation: number;
/**
* The average wind speed measured at 2 meters over the time period (in miles per hour). A measurement taken at a