11 Jan 2025, 14:08
@bertderkleine sagte: DD(r,T) = r/100 * SDD(T)
Division durch 100 vergessen?
Mathematik in Blockly - was übersehe ich?
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Hallo,
ich versuche gerade, den Taupunkt mit einem Blockly Script zu berechnen.Die Formeln dafür sind folgende:
Bezeichnungen: r = relative Luftfeuchte T = Temperatur in °C TD = Taupunkttemperatur in °C DD = Dampfdruck in hPa SDD = Sättigungsdampfdruck in hPa Parameter: a = 7.5, b = 237.3 für T >= 0 a = 7.6, b = 240.7 für T < 0 über Wasser (Taupunkt) Formeln: SDD(T) = 6.1078 * 10^((a*T)/(b+T)) DD(r,T) = r/100 * SDD(T) r(T,TD) = 100 * SDD(TD) / SDD(T) TD(r,T) = b*v/(a-v) mit v(r,T) = log10(DD(r,T)/6.1078)und ich habe das im Blockly folgendermassen umgesetzt:
Leider kommt da ein konstanter falscher Wert raus.
Ich vergleiche das einfach mit einer Berechnung in Excel.Ich mutmasse, ich mache irgendwas im Blockly falsch.
Jemand eine Idee, was genau?
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@bertderkleine sagte: DD(r,T) = r/100 * SDD(T)
Division durch 100 vergessen?
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@paul53
Hm. Ich habe einen DP mit einem Wert von z.B. 85%, während die Formel m.E. davon ausgeht, dass da eine Angabe "85" stünde.
Daher habe ich bisher noch nicht zusätzlich mit /100 hantiert. -
@bertderkleine sagte: Wert von z.B. 85%
Dann muss mit 0,85 multipliziert werden. Der Dampfdruck kann nicht höher sein als der Sättigungsdampfdruck.
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@paul53
Danke Dir für den Anstoss. Es lag tatsächlich an dieser 100er Sache.Irgendwie deutet das Blockly den DP, der in Objekten als 85% angezeigt wird als 85 und daher braucht es in der Formel dann auch die /100.
In meinem Excel muss ich die /100 weglassen, wenn ich 85% (also 0,85) reinfüttere. Da darf ich die /100 nur nutzen, wenn ich wirklich 85 reinschiebe.
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@bertderkleine sagte in Mathematik in Blockly - was übersehe ich?:
Irgendwie deutet das Blockly den DP, der in Objekten als 85% angezeigt wird als 85
natürlich!
der Wert ist 85, egal ob dahinter Gramm, Kilometer oder %steht -
@bertderkleine sagte in Mathematik in Blockly - was übersehe ich?:
der in Objekten als 85% angezeigt
Weil das ja auch nur die Anzeige ist.
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Magst du vom. Fertigen blockly mal ein Export einstellen?
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Hier bitte:
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type="math_rndfixed" id="xY9-+o53nTWYE`PV!(K:"> <field name="n">2</field> <value name="x"> <shadow type="math_number" id="5o~4bRrx(^NK-!jZ%2,R"> <field name="NUM">3.1234</field> </shadow> <block type="variables_get" id="u7J)@W[vp4x`nKq!fJju"> <field name="VAR" id="L8Cs7E?B?X]eu~q}*h;c">AF</field> </block> </value> </block> </value> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </next> </block> </statement> </block> </next> </block> </xml> -
Homoran Global Moderator Administrators last edited by Homoran 12 Jan 2025, 08:40 12 Jan 2025, 08:39
@bertderkleine sagte in Mathematik in Blockly - was übersehe ich?:
erfüllt aber auch den Zweck:
naja, kommt auf dden Zweck an.
Diese Ausgabe kann man aber nicht mehr nach Blockly wandeln um sie dort anzupassen. -
Codierknecht Developer Most Active last edited by Codierknecht 12 Jan 2025, 16:48 12 Jan 2025, 16:48
@bertderkleine
Bitte XML nur zusätzlich (im Spoiler) mitliefern. Nicht jeder mag das erstmal importieren, um zu sehen was da Sache ist.Blockly bitte primär immer als Screenshot.
-
@codierknecht
Hat er doch oder? Den Code hat er mir auf Nachfrage gesendet. -
@david-g sagte in Mathematik in Blockly - was übersehe ich?:
Hat er doch oder? Den Code hat er mir auf Nachfrage gesendet.
@David-G @BertDerKleine
Sorry, glatt übersehen
Asche auf mein Haupt.
