Hot answers tagged

43 votes

Why not put servers in a refrigerator?

A refrigerator is basically a heat pump designed to achieve a temperature close to 0 °C. There are a couple of problems here: Most refrigerators are way too weak to effectively tackle the heat output ...
  • 431
18 votes
Accepted

How are passive houses made in very hot regions (like Saudi Arabia)?

A yahkchal is an example of a type of passively cooled building in Iran They utilise a combination of passive evaporative cooling and thick thermally insulating walls in order to keep the interior ...
  • 1,168
18 votes
Accepted

Why not put servers in a refrigerator?

We do. It's just an up-sized (i.e. more powerful) version of a refrigerator known as an air conditioning unit. Essentially all server rooms and most spaces where PCs are located (speaking for the U.S.,...
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12 votes

Why not put servers in a refrigerator?

refrigerator boxes tend to generate condensate There are specifications for acceptable relative humidity (RH) for servers. Air conditioning in server rooms will maintain RH within the allowed limits ...
11 votes

Why not put servers in a refrigerator?

Here's a webpage from a random guy who put a light bulb in his refrigerator to see what would happen, and took careful data to monitor it. Results: The next experiment was to put a 60-watt ...
10 votes
Accepted

How to design a house to be cooled passively?

In dry/arid areas a wind catcher tower in conjunction with a qanat is a great way to keep buildings cool. The underground water stays cool and cools the air passing over it that is drawn in through ...
  • 5,960
9 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Insulation, shade, the use of low thermal conductivity materials and utilising any cool breeze at any time of the day are going to be key to passively cooling buildings in a hot climate. Different ...
  • 9,527
8 votes
Accepted

Cooling tower for nuclear power plants

The hyperbolic shape of cooling tower is preferred as this shape is stronger against wind pressure. Consequently, the concrete wall thickness can be reduced and optimised. from 1.5m at the base of the ...
  • 96
7 votes
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How to remove heat from an IP66 enclosure?

Considering the three methods of moving heat: Convection - To keep the IP66 rating of the enclosure, you can't add any holes for exhaust fans. Radiation - At the temperatures that you are talking ...
  • 10.7k
7 votes
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Radiators in series or parallel?

The efficiency of any radiator (heat exchanger) is a function of the temperature difference between the two fluids in question. All else being equal, a heat exchanger with a greater temperature ...
  • 6,759
6 votes
Accepted

Do heat pipes work in any orientation?

Orientation does often matter. As Carl's answer mentions, the liquid can get from the condenser to the hot interface via capillary action, but most common heat pipes are designed assuming gravity ...
  • 11.3k
5 votes

Why is minimum pressure specified on a PSU water cooling circuit?

You did not specify what materials you are working with and neither the dimensions. I made some assumptions. First of all, the coolant circuit is likely driven by a pump. Therefore you need to know ...
  • 1,704
5 votes
Accepted

How does the shape of CPU/GPU fan blades affect their performance and loudness?

Hopefully some helpful observations: Both fans have the same power rating Blade size differs I would have thought given the power rating this would equate to the smaller blades having a faster rpm, ...
  • 308
5 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Diurnal swings, i.e. temperature differences between day and night, are also an important consideration in hot climates. If the temperature at night drops to something acceptable, you can use night ...
  • 377
5 votes
Accepted

How much does an evaporative cooler cool down a room

The capacity of an evaporative cooler depends on the relative humidity. The lowest theoretical temperature that the cooler can reach is the wet bulb temperature. The wikipedia article has some ...
  • 377
5 votes

Why not put servers in a refrigerator?

They've been doing that with computers for 30+ years. Back when computers were the size of refrigerators. They use to get a regular air conditioner. Build a platform for the computer to stand on. ...
  • 51
4 votes

How are passive houses made in very hot regions (like Saudi Arabia)?

Farther from the equator, a passive house is mainly a very well insulated house with good exposure to solar lighting for passive solar heating. However in hot climate, one has to rethink completely ...
  • 631
4 votes
Accepted

How do you actually control the cooling level of AC?

The temperature of evaporated refrigerant gas is constant as a property of refrigerant material. And usually it is considerably below the thermostat setting in the controlled space. The design of the ...
  • 21.2k
4 votes
Accepted

How small can coolers get?

A Peltier cooler would fit the requirements you set out. They can be compact enough to fit the 'wristwatch sized' requirement and use electrical power to achieve the cooling effect. You do still ...
  • 15.1k
4 votes
Accepted

What are heat sink options for a circulating-water cooling vest?

What you first need to establish is your temperatures. Body temp min and max; ambient min and max. Select the worst case. Then take some guesses as to how much heat you have to pump. Is the vest ...
  • 7,499
4 votes
Accepted

Why is minimum pressure specified on a PSU water cooling circuit?

The pressure requirement could also be to raise the temperature at which the water boils. The boiling point of water depends on the pressure it's at; higher pressure raises the boiling point, as the ...
  • 2,989
4 votes
Accepted

Should an auxiliary cooling fan blow air or draw it?

The air coming out of the fan will be highly turbulent, wheras the air being sucked into the fan is less so. Hence blowing at the target will increase heat transfer. On the other hand, if you are ...
  • 206
4 votes

Why not put servers in a refrigerator?

The price-to-effect ratio for heat pumps is just not there for any large scale applications. Especially since air or watercooling is far less complex, and therefore a lot, lot cheaper. Dust is ...
  • 140
4 votes

High Fan Speed Not Cooling As Expected (PWM, Arduino)

Most likely the fan is getting into the stall regime and the flow then drops or the exhaust port is causing a pressure drop that the fan cannot overcome after a given speed.
  • 14.2k
3 votes
Accepted

What happens to silicone gaskets (siloxane rubber) in presence of ethylene glycol?

Based on the available data it looks like it will perform well: efunda.com - (4) Good, both for static and dynamic seals pspglobal.com - 1 = Recommended Temperature and additives may change this, ...
  • 7,499
3 votes

How does the shape of CPU/GPU fan blades affect their performance and loudness?

Factors determining fan airflow (heat reduction): Blade pitch. Blade shape and size. Motor power and RPM. In your case 3 is the same, 1 and 2 in the "newer version are bigger", so it will cool ...
  • 137
3 votes

How to remove heat from an IP66 enclosure?

Just out of curiosity, if the enclosure is sealed what will an oxigen sensor measure. I would conduct the heat outwards via a metal structure. But cosidering the heat your sensor generates, I would ...
  • 427
3 votes

How to remove heat from an IP66 enclosure?

Since your enclosure is IP66 you can pour a steady stream of water over it to absorb and carry the heat away.
  • 5,960
3 votes

Should an auxiliary cooling fan blow air or draw it?

I think it would depend on the enclosure. In an open environment, it would be better to blow cool air at the target. For closed cases, it seems more common to blow hot air out if there are not fans in ...
  • 131
3 votes

Should an auxiliary cooling fan blow air or draw it?

There is a big difference in the resulting flow during blowing and suction. Blowing creates a reasonably well directed jet of air, while suction pulls air from all around. Therefore blowing is better ...
  • 31

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