Tagged Questions
0
votes
1answer
48 views
Time constant of ice melt
I'm familiar with problems of "how much ice can you melt given some amount of energy", but I'm writing to get some clarification on the time constant of this event. This question might be somewhat ...
12
votes
6answers
866 views
Does an empty refrigerator require more power to stay cold than a full one?
Given that everything else is equal (model of fridge, temperature settings, external temperature, altitude), over a given duration of having the door closed, does it require more electricity to cool ...
0
votes
2answers
66 views
Is it possible to “add cold” or to “add heat” to systems?
Amanda just poured herself a cup of hot coffee to get her day started.
She took her first sip and nearly burned her tongue. Since she didn't
have much time to sit and wait for it to cool down, ...
6
votes
2answers
148 views
When should I take wine out of the fridge - transient heat transfer problem
I am hosting a dinner tonight for which I'll be serving white wine (Riesling to be more specific). Generally white wine is best served chilled (not COLD!) at around ...
0
votes
1answer
124 views
Ideal gas temperature and pressure gradients?
Consider an ideal gas in a $d\times d\times L$ box with the $L$ dimension in the $x$-direction. Suppose that the opposite $d\times d$ sides of the box are held at temperatures $T_1$ and $T_2$ with ...
0
votes
0answers
33 views
Thermal Physic ($\lambda$) and ($C_p$) calculation for multilayer wall [closed]
I would like to know, how could I calculate the Thermal conductivity ($\lambda$) and heat specific ($C_p$) of Multilayer wall? (I have a wall with 9 layers which are included wood and air)
8
votes
4answers
749 views
What happens when you heat vodka in a microwave?
Since ethanol has a lower dielectric constant than water would the water heat up and boil before the ethanol? Would the water transfer heat to the ethanol and, since ethanol has a lower boiling point, ...
2
votes
0answers
32 views
In a non-degenerate plasma, why are e-e collision negligible compared to e-ion for thermal conduction?
I'm trying to make some order of magnitude estimates of heat transfer in stars - to better understand 1) why conduction is said to be negligible (for non-degenerate matter) and 2) when convection ...
1
vote
1answer
137 views
Does a Peltier Thermoelectric layer make a good regulator for LN2 heat-sink interfacing
I understand that when cooling water with LN2 directly (through pipes for example), that it can be too effective, freezing the water (and blocking the pipe).
From what I read, regulation of the heat ...
1
vote
3answers
353 views
Maximum efficiency for a counter-current heat exchanger (double flux controlled motorized ventilation)
I am not sure if I can explain the question correctly because I don't know the name of this mechanism in English.
This is my explanation attempt: In a house, a tube is expelling the air from the ...
3
votes
2answers
534 views
Why is oil a poor conductor of heat?
Why is oil a poor conductor of heat? Does it help in insulation?
3
votes
4answers
522 views
Why water inside a vessel placed in a body of boiling water does not boil?
Imagine a plastic sac filled with water placed in a pan of boiling water. I wonder why the water inside the sac does not boil. The temperature of the water inside the sac should be the same as that of ...
5
votes
3answers
2k views
Are specific heat and thermal conductivity related?
Are there any logical relationship between specific heat capacity and thermal conductivity ?
I was wondering about this when I was reading an article on whether to choose cast iron or aluminium ...
3
votes
2answers
211 views
What devices could be taken round dwellings to measure the thermal conductivities of buildings in situ?
Your lateral thinking and knowledge of lab kit could help us solve a tricky measuring problem in building-physics.
One of the problems we get in modelling the heat demands of buildings, is getting an ...
