# Questions tagged [cooling]

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### Would water flow in the following system? [closed]

Would water flow in the following system?
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### Newton's law of cooling , divergence of heatflux

The thermal diffusion eq is according to my book, Where J is heat flux, C is heat capacity per unit volume. The, to the Newton's cooling law, and what I don't understand here is, the first eq part ...
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### Why can't we do this to reach absolute zero?

I have seen the argument that one cannot reach absolute zero in a finite number of steps. For instance on Wikipedia, it states It is impossible by any procedure, no matter how idealized, to reduce ...
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1 vote
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### What determines the black hole accretion rate?

There is clearly a natural timescale to accrete matter around a black hole given by the balance of pressure and gravity, known as the Eddington luminosity. However, as I understand it, this is really ...
• 1,188
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### Isochoric gas process taking heat from surrounding environment

this is a $pV$-diagram of Stirling cooler: A => B and C => D processes are isothermal, co temperature in D is same as temperature after cooling on high temperature side. Although, temperature ...
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### How long does it take, and how much heat, to raise the temperature of air in a box?

I am seeking to crudely model a house with a window as a perfectly insulated box with a hole (which only allows radiative heat). My question is to find how the temperature of air in the box changes ...
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### Does it make sense to discuss entropy change at different time frames?

The classic cup of tea cooling problem, why does it not violate the 2nd law of thermodynamics. The classic answer would be that the increase in the entropy of the surrounding is greater than the ...
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### Is their any convention for measuring cooling in a material?

Im dealing with laser heating and cooling, in this area you have a lengths that are accepted measures such as an absorption depth and Diffusion length. https://www.pveducation.org/pvcdrom/pn-...
1 vote
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### Doppler cooling Ethanol

Is it possible to use laser cooling to cool Ethanol in it's gas phase? I've seen research on IR diode cooling when you reverse the electrodes but laser cooling was/has always been limited to atoms and ...
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### Is my modification of Newtons Law of Cooling an infraction?

I'm working on temperature prediction and therefore also cooling. I stumbled upon Newton's Law of Cooling (NLC) and I do like its simplicity, but I'm not so happy about the condition that the ...
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### Why does steam exiting a pressure cooker valve feel cool to the touch?

I made the surprising discovery that steam escaping a pressure cooker through a screw-valve on top of the pot feels relatively cool: I can comfortably place my hand on the steam without getting burnt....
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### Accuracy of Newton's law of cooling

I've made an experiment to verify Newtn's law of cooling, but while doing the analysis, my results don't fit accurately with the data collected (303 data using a sensor). According with my initial ...
1 vote
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### Thermoelectric cooler's Qmax cites maximum heat transfer — how is it so close to rated wattage considering TEC's low efficiency?

Some background regarding my question: I'm thinking if making some sort of TEC-based ice cream maker. Considering the combined specific heat capacities, I calculated (possibly incorrectly) the value ...
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### Is it possible to cool down air with warm water?

Is there some condition in wich the water evaporation can cool down the air even if the water is hotter than the air?
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### Why is it hard to cool a mini-PC to room temperature?

I have this passively cooled mini-PC that froze every few days. After a lot of investigation I realized that it was overheating (running android studio and such) so I bought a fan, an arduino nano and ...
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1 vote
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### Heat dissipation in space - how do they do that?

Consider a space aircraft. During its propulsion, I believe a lot of heat is transmitted to the aircraft by simple contact with the motor. But in space, there is no air to cool the aircraft. The only ...
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### Can cooled gasses be bubbled up through water to cool it?

I'm working with a pressure vessel that is cooled to a reasonably cool temperature. Since it is cooled at pressure when the air exits the pressurized system the gas expands and thus cools a great deal ...
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### Energy-optimal beer cooling

Suppose that I am going to host a big party one month from now, and I have various liters of cold beverages that will need to be refrigerated by the time of the party. I have a fridge at home (which ...
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### What is the Festina Lente Regime?

I am studying BEC formation without evaporative cooling, so realized only thrpugh optical means. One of the problems to face is "photon reabsorption": an atom absorbs a photon of the laser ...
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1 vote
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### Air conditioner on rainy day [closed]

I got a new LG 1.5 ton AC(Air conditioner) . It's summer time here and the temperature reaches approx 40 degree Celsius at peak time. And it's working quite satisfactorily. But in the last two weeks ...
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### Can a fan in a room cool down objects?

Does a fan cool objects? I have a ceiling fan in my office which really helps to keeps the room cool. Does it also cool down vitamins in a plastic bottle with a screw on top? My office can get very ...
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### Initial and final pressures for the Joule-Kelvin expansion?

The Joule-Kelvin (or Joule-Thomson) expansion is an isenthalpic expansion in which the reduction of a gas' pressure from $P_{i}$ to $P_{f}$ results in a change in Temperature. It results in ...
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### Temperature drop along silicone tube

I would like to ask your help to calculate the temperature drop of a fluid (at a specific conductivity) that flows in a silicone tube at different rates. This is a real case and I expect to perform ...
3k views

### Open window in hot room, how fast will temperature equalize? [closed]

I am currently sitting in a warm room. I just opened a window to the outdoors, where it is cooler. Middle school science says the warm air should move toward the cool air, which should (in theory) ...
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