Read about cooling | 29 Discussions | Page 1

  1. Annindita94

    I Cooling Time for Air Conditioning

    Please advise for cooling time on air conditioning. I have a project and customer asked me to make a comparison between their requirement and my proposal. And here's the result. Let's say that we provide a room with same capacity as above, function, delta T, load on that room, but ONLY air...
  2. StoningTree

    Cooling with Evaporation

    First i calculated the latent heat of vaporation: h_vap(15°C)= 2465.4 kJ/kg In the next step i calculated how much water is already in the air: x=0.622*j*ps/(p-j*ps)=0.00988 kg/kg where: j=50% ps=0.03171 bar p=1.01325 bar Now that i know that i can calculate the enthalpy of humid air: h_hum =...
  3. Anon_Miner

    How to cool down Mineral Oil

    Hello friendly people of PF So I have a tank with about 250 litres of mineral oil in it. and computer servers are immersed in it. the oil keeps the servers cool but get's hot in return. What different (economic) ways are there to cool the oil down? The best way I could think of was Oil-water...
  4. FEAnalyst

    Cooling nozzle - convection power

    Hi, when modeling convective cooling in FEA one needs to define film coefficient ##h## and ambient temperature ##T_{amb}##. The software calculates convective heat flux using this data and current surface temperature ##T_s##: $$q=h(T_{s}-T_{amb})$$ However, modeling of moving cooling nozzle may...
  5. Anon_Miner

    Where do I put this Server Room's air exhaust?

    Hey guys. I have a room which i want to use as a server room. the devices need to work 24/7 and they get pretty hot. so it is imperative to keep the room cool otherwise the devices will be damaged. I have an air vent to bring cold air into the room for the devices so their fans can suck in cold...
  6. J

    Heating a soup (solving this problem with a DE)

    I'm having quite a bit of a problem with this one. I've managed to figure out that ##T_0 = 0##. However, not knowing what ##q(t)## is bothers me, although it seems that I could theoretically solve the problem without knowing it. For ##t>t_1##, integration by parts gives me ##T = Ce^{-t/10}##...
  7. Ramazan Duzgun

    What is the design methodology of a Heatsink for a high-power diode?

    In reference of Ned Mohan's book, I have designed a heatsink, firstly natural convection taken into account, but laboratory test results and theoretical calculations are not matching. The test results: For 40 A (means 62 W), 30 Celsius ambient temp, it raised up 51 Celsius. So, Rs-a =...
  8. G

    I Glass -- how to increase the surface area

    I need to increase the surface area of the glass which will be used in a solar still with the intention of keeping the glass as cool as possible. My first thought was bubble wrap because it's transparent and I thought it would not interfere with the light but then I remembered it is a good...
  9. T

    Misc. Thermal Dissipation problems

    I am working on a project; a computer case made out of wood, most likely oak. I was wondering if two fans (one bringing air in, on taking air out) would be enough to keep the system at a stable temperature. I wasnt sure because i know most cases are made of thin metal which conducts and...
  10. D

    I Effect of ambient pressure on newton cooling (water)

    If I have a laboratory water bath (circulated for homogeneity in temp) that I will monitor over a period of time (probably 2 scenarios, an hour at most, and then at least 24 hours or longer), how do I quantify the effect of atmospheric pressure in our test lab. What I will do is use an...
  11. A

    I Cavitation in a closed loop pumping system

    Dears Kindly, I want to hear from you regarding this topic. The system is closed cooling system. I believe it is difficult to attribute the sound you hear from centrifugal pump to be a cavitation especially if the discharge pressure is normal. The last time we had a problem with this system...
  12. David Dincer

    Cooling for Underwater Monitor Housing

    Hi, I have an underwater monitor housing made out of carbon fiber and an acryllic Glass on the other side. Over time the monitor heats up. I guess carbon fiber is a bad heat conductor :(. the Acryllic glass is almost 1cm thick. Does anybody have an advice on how to cool something like this...
  13. G

    I Cooling a gas by releasing it into vacuum: Entropy?

    Hi. I just read an article where following cooling method is described. Apparently it's very common, but I don't know what it's called: A gas under pressure is released into a vacuum through a small hole. The average particle speed in this beam of gas is the same as before, but the...
  14. L

    Contact Cooling

    Hi, I am designing a system to cool aluminium through contact cooling. I have a steel die with 9x 20mm diameter cooling chambers. Water is pumped through the chambers which cools the steel die and hopefully the aluminium sitting on top of it. I am looking to find the temperature of the...
  15. Ravi Singh choudhary

    I In which case coffee will cool faster?

    Just Qualitative Analysis: There are many ways of cooling a coffee cup. But here I want to understand about concept of fins. So I am using a spoon to enhance the heat transfer rate. Put the spoon vertically in the cup. We have two ways to put the spoon, other one is upside down. I am curious to...
  16. Assim

    I Cooling down hot water

    I have a project which i need to cool down certain quantity of hot water. I need to cool down water of around 25 litres at 50 Degree celcius to 30 Degree celcius, Static water, not flowing. (or incoming 50 Degrees - Outgoing 30 Degrees with approx 1.5 gallons per minute flow rate) time...
  17. M

    I Eco-cooler physics

    Hi, How can eco-cooler works? The explanation of blowing with mouth are totally wrong, but I am curious aboud dynamic of air flow, if is possible to achieve measurable cooling Thanks
  18. O

    I Inversion and Isenthalpic Curves for van der Waals EOS

    When I plot the isenthalpic curves in T-P plane, I see isenthalpic curves are not well defined in the lower temperature region in T-P plane. Inside the inversion curve Joule-Thomson coefficient is positive so gas cools and outside of the inversion curve Joule-Thomson coefficent is negative so...
  19. Rick Glimmer

    Daytime: Solar->Ice-> Nighttime:Air conditioning

    I am trying to figure out how much ice i need to produce during daytime to cool a bedroom at nighttime. Currently a 9000 BTU Air conditioner with a separate indoor and outdoor unit is more than sufficient. The air conditioning is set to 24 degrees Celsius and the outdoor temperature goes from 32...
  20. Mbywater94

    Understanding the use of a figure in thermodynamics.

    I came across an equation used in one of the forums from a few years ago. Found here: https://www.physicsforums.com/threads/calculate-how-long-it-will-take-for-the-ice-to-melt.531908/ I am researching a similar topic into melting ice and using it as a cooling solution. However when i came...
  21. RaulTheUCSCSlug

    Greenhouse effect affected by Earths Gravity?

    Hey, so I was thinking how the atmosphere is held close to earth due to gravity and realized that if certain molecules have a certain amount of kinetic energy, they are bound to leave the atmosphere correct? I mean there is an escape velocity that these molecules must need and I'm sure molecules...
  22. C

    Questions on keeping a house cool

    Hi guys, I have a question on cooling the house. So at night, I usually open windows to let all of the cold air come in and open the 2nd floor windows to let the hot air out. The 2nd floor is a large open area and has windows in the front and windows in the back. Now, I normally open all the...
  23. P

    External oil cooling system (calc & design)

    Hi everyone! I need some guidelines on how to calculate and design an external oil cooling system (the oil cooler is located outside of the oil tub) for a thrust bearing. Could you please give me some links to standards, handbooks, manuals etc to start with? Thank you.
  24. E

    Engineering Cooling Integrated Circuits with Peltier Cells

    Homework Statement Hi all, I have a question about using peltier cells for both cooling and reading temperature in the same moment. I need to cool down a couple of Integrated Circuits so I'll put put a 20mmx20mm peltier cell over them but I cannot read the cold side of the cell because it's...
  25. M

    Peltier cooler- thermodynamics

    Im working on a project for fun using a peltier cooler. A tec1-12706. If i am operating the peltier at 9v, 6.4 amps of current and dt =45ºC (from datasheet) and bring its cold side in contact with a body at 33ºC for 10 seconds. Keeping hot side at 27ºC(cold side =-18) using sink, what will be...
  26. Rotzooi

    Heat transfer of a hot plastic thread in a cold water bath

    Hi, I'll describe my problem more specific. I have a continuous flow of this polymer thread (polystyrene) at 465 °K (190°C sorry i'm metric) that needs cooling down. It passes trough a water bath wich is kept at 310°K (35°C). Now i try to calculate the heat exchange into the water, to determine...
  27. D

    Help with prototype

    I am currently working on a prototype for a new product. Whithout exposing the product to much it is simply put a cooling box run by solar panels with a battery backup. Due to the fact that the surface area available for solar panels is limited the cooling module needs to be quite small and...
  28. duran9987

    Cooling liquids by blowing

    I just began reading Feynman lectures and it turns out that during evaporation, water molecules that move faster than average (higher temp) break away from the attraction of their neighbors leaving behind molecules that move slower than average (lower temp) and result in a cooler liquid. When a...
  29. M

    Vortex Tube for cabinet cooling

    Hi, I'm a mechatronics student and I am currently working on a project on the effectiveness of a vortex tube to cool a cabinet. The cabinet has a thermostat inside and if the temperature exceeds a threshold, an air compressor is turned on, causing the vortex tube to cool the cabinet. The cabinet...
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