Questions tagged [cooling]

Questions regarding Cooling electronics. Varies based on needs, can include Fans, Heatsinks, proper ventilation, Peltiers, or PCB design and mounting. Could also refer to Cooling applications, like freezers in industry. Repair questions for Cooling applications will most likely be closed if outside the Scope of the Site and FAQ. Try DIY.StackExchange.com for those.

Filter by
Sorted by
Tagged with
-1
votes
1answer
60 views

Cooling in fridges and air conditioners [closed]

I am wondering how do fridges and air conditioners cool things. I know the theoretical stuff like gas laws but our teacher could not explain how actually the cooling is achieved (All I know is a ...
1
vote
1answer
7k views

Could I create Peltier cooling module from iron and copper?

I want to create a tiny, easy to maintain one-purpose distilation unit. It's supposed to distilate expensive tetrachlorethylene to clean it from whatever is dissolved in it. There are millions of ...
0
votes
1answer
308 views

Can convection draw cold air INTO a PC case?

So imagine I'm mounting my nettop-style PC behind my monitor. Its CPU is passively cooled via heatsink. Now the side facing up should have vents so the warm air can escape the case but shoud the side ...
1
vote
1answer
711 views

Thermoelectric couple heating on both sides [duplicate]

In college my physics professor showed us a thermoelectric couple powering a fan. He also explained how if you apply a current it cools one side and heats the other side. I have been working on a ...
7
votes
2answers
5k views

How does power dissipation for surface mount components work?

I know that with usual through hole components we can attach heatsinks etc. But how does it work with surface mount components? Is having a copper plate around the component the way to go? How do we ...
2
votes
1answer
153 views

Heating and Chilling ICs instantly from 200C to 0C? Does it damage the silicon inside?

I soldered VCXO oscillator and suddenly tried to cool it down with a cooler spray. Do you think that sudden cooling and heating damages the chip. The heating and cooling were well within the spec ...
3
votes
1answer
134 views

Regime of unsteady flow over heat sink

For my master thesis I'm simulating the cooling of an 2.5D microchip (2 dies next to each other on an interposer (slice of silicium with interconnections)). So I want to calculate the flow over the ...
1
vote
1answer
1k views

LED PCB bulb - how much cooling do they need, what is their maximum temperature

I am building a SAD (Seasonal Affective Disorder) light box - its a super bright light. The specs of the LEDs I am using: ...
5
votes
2answers
951 views

Experience with thermal glues/adhesives?

I'm planning on using a thermal adhesive to bond an LED pcb to an aluminum enclosure. The enclosure is meant to serve as a heat sink and wick away any heat generated by the LED board. The aluminum ...
4
votes
1answer
795 views

Which side should I place a TO-220 transistor on a heat sink?

On TO-220 heat sinks, there are usually two sides, on which the transistor fits easily. One side is more narrow, surrounding the transistor. The other side is more open. Which of these sides is ...
2
votes
4answers
15k views

Peltier Unit Not Working

Recently I ordered a Peltier unit online and received it yesterday. Naturally, I was very excited to play with it. When I first turned it on, One side got hot, an another very cold. I had read that I ...
11
votes
3answers
4k views

How to cool down DIP devices?

I have AD811 in my application that works just fine but as it is working in +/-15 v supply at around 14.5 mA, it's power is around one third of watts. It is hot when touched. I checked if this is a ...
1
vote
1answer
360 views

Thermal paste residue very difficult to clean

I'm trying to remove thermal paste residue from the die of my Radeon GPU with q-tips and isopropanol. The CPU was fine, but the GPU is extremely stubborn. It looks worn and dirty regardless of how ...
4
votes
1answer
857 views

Does the Arduino have any specific cooling requirements?

If I were to encase my Arduino in a sealed case with no ventilation, would this be an issue? What about if I were to pot the Arduino in epoxy, would that pose a cooling issue?
5
votes
3answers
4k views

What properties vary with the number of blades on a BLDC fan?

In general, what properties vary with the number of blades on a axial BLDC fan when physical and electrical dimensions are the same (e.g.: rated at approximately 12V and 0.15A and 60mm Ø)? So far I'...
3
votes
3answers
3k views

Can a soapbox-sized device dissipate 10-15W of heat? If yes, how?

Some time ago, I built a soapbox-sized battery testing device. One of its functions was to discharge batteries at a specified current, and it handled most of the common battery sizes well, but its ...
2
votes
2answers
2k views

What dielectric liquids can be used as coolants?

I've seen some interesting videos of people putting their computers in containers with sunflower oil, where they continue to work normal. Are there any other dielectric liquids that can be used to ...
4
votes
3answers
910 views

Calculate the effects of cooling fans on a system?

If I have a home-audio receiver that draws a given amount of power (lets say 200W), and its passively cooled reaching a temperature differential of 50F over ambient, how can I calculate how much ...
9
votes
2answers
666 views

Pour-and-drain conformal coating as an alternative to potting

Is there a standard process to pour conformal coating, similar to potting, but then drain the excess? The benefit of draining the excess is to reduce weight and get better cooling. From my limited ...
6
votes
2answers
7k views

How to find a fitting cooler/heatsink for a Mosfet?

How do I find a fitting passive cooler/heatsink for a TO-220 Mosfet? What parameters do I have to search for?
0
votes
1answer
280 views

Computer in oil inside refrigerator [closed]

I have a computer outside its case. All the components are attached and working properly, the problem is that fans dont seem to do a good enough cooling when demanding programs such as high end games ...
9
votes
4answers
7k views

How do I make an opamp comparator work in schmitt-trigger mode?

I want to control a small 12V case fan. I will set values of R1, R2 and R3 so that the fan will work above temperatures 40oC. I understand that in these kind of systems, there will be an indecisive ...
4
votes
2answers
3k views

Heat Transfer of Aluminum Plate with LEDs

I'm building an LED grow light for an, um, indoor vegetable garden, and I'm trying to figure out what dimensions I can get away with for the aluminum sheeting I'm going to use for the mounting plate. ...
0
votes
1answer
117 views

What device should I buy to cool liquids in a container [closed]

Basically I have a large Evaporative Cooler (one of those fans that you can put water in the bottom of). It has a really large container so it can last a day or two. The problem is once the water gets ...
22
votes
3answers
679 views

How do you build a machine in a solid block?

I'm aware that a number of mass produced electronics are embedded in a solid thermal resin of some form. How reasonable is that for the home hacker? What materials are used? How do you do it? Are ...
3
votes
2answers
748 views

Shunt resistor specifications do not contain thermal resistance data. How come?

I'm looking at the specifications of an ohmite shunt resistor: http://www.ohmite.com/catalog/pdf/10_series.pdf It is a 0.005 ohm resistor, rated at 2,3,5 and 7 Watts (4 different parts in the same ...
9
votes
4answers
3k views

How to cool electronics when the air is always hot

I'm in the process of planning an experiment that involves placing some electrical equipment in a mine for a year or more. Where the equipment will be placed in the mine (770m in depth,) the amient ...
7
votes
4answers
6k views

Effective MOSFET cooling

We need to drive a motor with around 40 Amps. The mosfet has an Rdson of about 7 mohms at 90 degrees Celsius. That is a whopping 11.2Watts of heat generated on the poor mosfet. We are very space ...
0
votes
3answers
157 views

cooling devices

i'm using a peltier device to cool my equipment but it seems not to be effective cause it dissipates too much heat. do you know any other effective cooling device which is very small like peltier. or ...
0
votes
1answer
2k views

Wiring an SPDT thermostat to simultaneously control heating and cooling devices

I've set up an old fridge with a custom thermostat to finely control the cooling levels of the contents but would like to provide heating to the unit if the temperature drops below the thermostat's ...
3
votes
3answers
675 views

Regulator cooling in a confined space

I've designed a simple PWM RGB LED slow fader to be used as a garden lighting effect. My circuit works great, but I under-estimated the amount of heat that is generated by the 7805 linear regulator. ...
7
votes
3answers
378 views

How to cool ICs?

I've read this question and in its comments it is said: LDO and IC heatsinks will generally have a very different answer then computer motherboard heat sink. This question really doesn't ...
21
votes
8answers
58k views

Fans: suck or blow?

For a fan, should air be sucked in, or should it blow air out? I'm talking about an enclosure mounted fan.