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
19
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.,...
- 306
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 ...
- 361
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 ...
- 211
5
votes
How can I vaporize metals?
The easiest way to vaporize a metal is to create a filament of the metal. Heat the filament in the vacuum to its sublimation (vaporization) temperature. Alternatively, when the metal cannot be shaped ...
- 2,878
5
votes
Accepted
Screw type associated with COM port/DB-9
4 - 40 UNC ASME/ANSI (US customary units rather than Imperial)
Thread Specifications
The final two digits are the number of turns per inch, so the pitch is 0.025" (US: 25 mils, UK: 25 thou).
- 361
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
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
3
votes
How to introduce the CONSTITUTIVE equation into structure mechanics
The balance of linear momentum is
$$
\nabla \cdot \boldsymbol{\sigma} + \rho \mathbf{b} = \rho \mathbf{a}
$$
where $\boldsymbol{\sigma}$ is the Cauchy stress, $\rho$ is the mass density, $\mathbf{b}$...
- 1,443
3
votes
Byte organized and Word organized memory using memory modules
If you notice, you need 20 bits to access the 1Mb byte modules.
But your processor is word aligned. So 2 1Mb byte modules form a 2Mb word module. The key to understanding how it works is the ...
- 2,467
3
votes
Computer engineers -- do computers use varying amounts of power?
Yes, a computer uses varying amount of power. Yes a 3D printer uses a varying amount of power. In fact all electrical devices do vary based on load.
Both motors and processors use more energy when ...
- 3,597
3
votes
Accepted
Can you perceive similar kind of "humanizing" of technology in other fields of engineering than computer science?
An important factor is that computing inherently has a numbers of layers of abstraction and function between the end user and the actual functionality. To some extent this is a from of automation in ...
- 15.2k
3
votes
Use two passive CPU coolers on one single CPU?
Well, I would think that two smaller ones rigged up in an "amateurish" fashion (apologies, but that's we both are, right) are going to be worse than just one (sufficiently large) properly mounted ...
- 241
3
votes
Explanation of network interdiction in layman terms
The first paragraph from your second reference seems pretty clear. The first sentence states that
Network interdiction is the monitoring or halting of an adversary’s activity on a network.
...
- 6,386
3
votes
What is the significance of a processors bit capacity?
There are several components in a microprocessor that may all have their individual size: data bus, address bus, registers, and ALU (arithmetic logic unit). Modern CPUs also have caches, memory ...
- 679
3
votes
Accepted
Are pixels not squares and more like rectangles?
Looks like a square to me - are you sure you selected the pixel checkmark, and also unchecked the "Maintain aspect ratio" box before typing in your second '500'?
- 7,726
3
votes
Accepted
Microscope Camera Windows NT
(Without knowing the model) Short answer is no.
In general older cameras (and even some newer ones) tended to use very customised communication protocols and drivers. Also the transition from Windows ...
- 24.3k
2
votes
Computer engineering: Physical time clock timing
Most computers / computing devices will have a real time clock (RTC) built in. This is normally included in the processor or motherboard chip set rather than as a separate part. It will be designed ...
- 766
2
votes
What can I use to calculate distance?
There are a couple of solutions available. You will have to decide a budget and the required accuracy to settle for one.
1) Laser distance sensor - These will give you pretty accurate measurements ...
- 171
2
votes
Accepted
BTech or BSc engineering
I think Bachelor of Technology (B-Tech) is mostly a designation used by Indian Institute of Technology (IIT) and National Institute of Technology (NIT). This write up describes
Bachelor of ...
- 7,125
2
votes
What is the significance of a processors bit capacity?
A 64 bit processor has a datapath and memory address width of 64 bit. The integer size is also 64 bits. In addition the registers, address bus and data bus is 64 bits wide.
Likewise in a 32 bit ...
- 7,125
2
votes
Accepted
Why laptop keyboard has so many bus lines?
The keyboard contains many switches (100 in my keyboard at this moment) and the simplest solution for a keyboard assembly that contains no decoding circuitry would be for each switch to have its own ...
- 14.3k
2
votes
Accepted
What is the mechanism of transition in applications of finite state automata?
A synchronous system with a clock is not necessary. The transition between states can be triggered asynchronously by inputs to the system (e.g. someone pushes a button to operate an automatic door). ...
- 12.5k
2
votes
Relation between residual stress and von mises stress calculated by FEA in comercial software
The Von Mises Stress and the residual stress are not the same thing.
To get the residual stress, do another time step where all the applied loads are zero. If there is material nonlinearity (...
- 12.5k
2
votes
How to find the smallest change in voltage
I order to solve this problem there one needs to understand the following
ADC range which is the maximum and minimum ADC input. For this problem the range is 3.2V, -3.2V.
ADC resolution which is the ...
- 7,125
2
votes
Accepted
How exactly do noise canceling headphones work?
Briefly they take the waveform of the ambient noise then produce the inverse waveform which is then generated. The two waveforms effectively cancel out leaving a much quieter ambient sound level.
The ...
- 15.5k
2
votes
Accepted
How is the most basic display driven?
Pretty much every display is multiplexed. Typically each column is turned on (pulled to positive supply, for example) in turn and the rows for the pixels to be turned on in that column are switched to ...
- 10.3k
2
votes
What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?
Ultra sound sensors could be used, you know the general size of all available container sizes and the material it is made of create a lookup table for such empty containers returning sounds. sound ...
- 131
2
votes
Microscope Camera Windows NT
I googled and found this site. read their instructions on installation carefully and do not download junkware if any is packed with your zip file.
AxioCam driver
- 22.1k
2
votes
Why not put servers in a refrigerator?
To address the problem from a more abstract, physical point of view:
The problem with servers is that they produce heat. This heat has to be deduced somehow. If it isn’t, the server will heat up more ...
- 123
Only top scored, non community-wiki answers of a minimum length are eligible