Wärmepumpe
About points...
We associate a certain number of points with each exercise.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
About difficulty...
We associate a certain difficulty with each exercise.
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
Question
Solution
Short
Video
\(\LaTeX\)
Need help? Yes, please!
The following quantities appear in the problem:
Temperatur \(T\) / Arbeit \(W\) / Wärme \(Q\) / Verhältnis / Anteil \(\eta\) / Leistungszahl \(\epsilon\) /
The following formulas must be used to solve the exercise:
\(\eta = \dfrac{a}{A} \quad \) \(\varepsilon = \dfrac{T_H}{T_H-T_L} \quad \) \(\epsilon = \frac{Q_H}{W} \quad \) \(\epsilon = \frac{Q_H}{Q_H-Q_L} \quad \) \(Q_H = Q_L + W \quad \)
No explanation / solution video for this exercise has yet been created.
But there is a video to a similar exercise:
In case your browser prevents YouTube embedding: https://youtu.be/5TfiStO7qnk
But there is a video to a similar exercise:
Exercise:
Der Kompressor einer Wärmepumpe benötigt pqW bei einer Heizleistung von pq.kW und einer Zieltemperatur von TCelsius. Die reale Leistungszahl betrage % der idealen. Welche Umgebungstemperatur wird im Idealfall benötigt?
Solution:
Die reale Leistungszahl ist eta fracPP_textscriptsize zug Das sind % der idealen Leistungszahl; diese ist folglich: eta_C fraceta. . Die Umgebungstemperatur müsste demnach im Idealfall T_k fracvarepsilon-varepsilon T_w pq.K pqCelsius betragen.
Der Kompressor einer Wärmepumpe benötigt pqW bei einer Heizleistung von pq.kW und einer Zieltemperatur von TCelsius. Die reale Leistungszahl betrage % der idealen. Welche Umgebungstemperatur wird im Idealfall benötigt?
Solution:
Die reale Leistungszahl ist eta fracPP_textscriptsize zug Das sind % der idealen Leistungszahl; diese ist folglich: eta_C fraceta. . Die Umgebungstemperatur müsste demnach im Idealfall T_k fracvarepsilon-varepsilon T_w pq.K pqCelsius betragen.
Meta Information
Exercise:
Der Kompressor einer Wärmepumpe benötigt pqW bei einer Heizleistung von pq.kW und einer Zieltemperatur von TCelsius. Die reale Leistungszahl betrage % der idealen. Welche Umgebungstemperatur wird im Idealfall benötigt?
Solution:
Die reale Leistungszahl ist eta fracPP_textscriptsize zug Das sind % der idealen Leistungszahl; diese ist folglich: eta_C fraceta. . Die Umgebungstemperatur müsste demnach im Idealfall T_k fracvarepsilon-varepsilon T_w pq.K pqCelsius betragen.
Der Kompressor einer Wärmepumpe benötigt pqW bei einer Heizleistung von pq.kW und einer Zieltemperatur von TCelsius. Die reale Leistungszahl betrage % der idealen. Welche Umgebungstemperatur wird im Idealfall benötigt?
Solution:
Die reale Leistungszahl ist eta fracPP_textscriptsize zug Das sind % der idealen Leistungszahl; diese ist folglich: eta_C fraceta. . Die Umgebungstemperatur müsste demnach im Idealfall T_k fracvarepsilon-varepsilon T_w pq.K pqCelsius betragen.
Contained in these collections
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Wärmepumpe am Grundwasser by TeXercises
| Title | Matched on |
|---|---|
| Wärmepumpe | title |
| Wärmepumpe | title |
| Warme Temperatur bei Wärmepumpe | tags |
| Elektrische Energie für Wärmepumpe | tags |
| Reale vs. bestmögliche Leistungszahl | tags |
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| Title | Matched on |
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| Wärmepumpe | title |
| Wärmepumpe | title |
| Warme Temperatur bei Wärmepumpe | tags |
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| Reale vs. bestmögliche Leistungszahl | tags |
| Kältemaschine QL [kWh] | tags |
| Kalte Temperatur bei Wärmepumpe | tags |
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| Kühlschrank im Restaurant | tags |
| Reale Leistungszahlen von Kältemaschinen | tags |
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| Wärmeentzug von Kältemaschine | tags |
| Leistungszahl von Wärmepumpe verschlechtern | tags |