Dehumidifier
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
\(\LaTeX\)
No explanation / solution video to this exercise has yet been created.
Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
A dehumidifier is essentially a ``refrigerator with an open door". The humid air is pulled in by a fan and guided to a cold coil where the temperature is less than the dew po and some of the air's water condenses. After this water is extracted the air is warmed back to its original temperature and sent o the room. In a well-designed dehumidifier the heat is exchanged between the incoming and outgoing air. This way the heat that is removed by the refrigerator coil mostly comes from the condensation of water vapor to liquid. Estimate how much water is removed in one hour by an ideal humidifier if the temperature of the room is TCelsius the water condenses at TCelsius and the dehumidifier does work at the rate of pqW of electrical power.
Solution:
The efficency of performance of an ideal dehumidifier working at these temperatures is varepsilon_textscriptsize KS fracT_LT_H-T_L . since we use the low temperature. The power at which heat is taken from the warm air in the ideal case is P_L varepsilon_textscriptsize KS P pqW. In one hour the heat Q_L P_L t pq.eJ can be taken from the air. This enough to condensate m fracQ_LL_v fracpq.eJpq.eJpkgK pq.kg i.e. around pql.
A dehumidifier is essentially a ``refrigerator with an open door". The humid air is pulled in by a fan and guided to a cold coil where the temperature is less than the dew po and some of the air's water condenses. After this water is extracted the air is warmed back to its original temperature and sent o the room. In a well-designed dehumidifier the heat is exchanged between the incoming and outgoing air. This way the heat that is removed by the refrigerator coil mostly comes from the condensation of water vapor to liquid. Estimate how much water is removed in one hour by an ideal humidifier if the temperature of the room is TCelsius the water condenses at TCelsius and the dehumidifier does work at the rate of pqW of electrical power.
Solution:
The efficency of performance of an ideal dehumidifier working at these temperatures is varepsilon_textscriptsize KS fracT_LT_H-T_L . since we use the low temperature. The power at which heat is taken from the warm air in the ideal case is P_L varepsilon_textscriptsize KS P pqW. In one hour the heat Q_L P_L t pq.eJ can be taken from the air. This enough to condensate m fracQ_LL_v fracpq.eJpq.eJpkgK pq.kg i.e. around pql.
Meta Information
Exercise:
A dehumidifier is essentially a ``refrigerator with an open door". The humid air is pulled in by a fan and guided to a cold coil where the temperature is less than the dew po and some of the air's water condenses. After this water is extracted the air is warmed back to its original temperature and sent o the room. In a well-designed dehumidifier the heat is exchanged between the incoming and outgoing air. This way the heat that is removed by the refrigerator coil mostly comes from the condensation of water vapor to liquid. Estimate how much water is removed in one hour by an ideal humidifier if the temperature of the room is TCelsius the water condenses at TCelsius and the dehumidifier does work at the rate of pqW of electrical power.
Solution:
The efficency of performance of an ideal dehumidifier working at these temperatures is varepsilon_textscriptsize KS fracT_LT_H-T_L . since we use the low temperature. The power at which heat is taken from the warm air in the ideal case is P_L varepsilon_textscriptsize KS P pqW. In one hour the heat Q_L P_L t pq.eJ can be taken from the air. This enough to condensate m fracQ_LL_v fracpq.eJpq.eJpkgK pq.kg i.e. around pql.
A dehumidifier is essentially a ``refrigerator with an open door". The humid air is pulled in by a fan and guided to a cold coil where the temperature is less than the dew po and some of the air's water condenses. After this water is extracted the air is warmed back to its original temperature and sent o the room. In a well-designed dehumidifier the heat is exchanged between the incoming and outgoing air. This way the heat that is removed by the refrigerator coil mostly comes from the condensation of water vapor to liquid. Estimate how much water is removed in one hour by an ideal humidifier if the temperature of the room is TCelsius the water condenses at TCelsius and the dehumidifier does work at the rate of pqW of electrical power.
Solution:
The efficency of performance of an ideal dehumidifier working at these temperatures is varepsilon_textscriptsize KS fracT_LT_H-T_L . since we use the low temperature. The power at which heat is taken from the warm air in the ideal case is P_L varepsilon_textscriptsize KS P pqW. In one hour the heat Q_L P_L t pq.eJ can be taken from the air. This enough to condensate m fracQ_LL_v fracpq.eJpq.eJpkgK pq.kg i.e. around pql.
Contained in these collections: