Questions tagged [thermal-conduction]
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39
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Volume of air required to keep electrical box cool
I have a steel electrical box that is 15cm x 15cm x 10cm. The weight of the box is 1kg. Inside the box is a relay that loses 30 Watts of heat while in operation (it's attached to a heat sink that ...
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16 views
What material characteristics are most important for heating element material selection?
I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
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2answers
41 views
Time to change temperature inside the box
I have an interesting problem here.
I have a box of certain dimensions. Inside of the box is some insulation and another box, from the same material as the outer box. I know everything possible about ...
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1answer
59 views
Wire heating and heat transfer in a cylindrical pattern
I have a series of copper coils with ¼” cooling plates between each coil. The cooling plates will be manufactured from aluminum and cooled using copper tubing. There are seven in series, and a plate ...
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2answers
62 views
Simple Thermal Analysis for sealed Aluminum box with 3.7 Watts of heat generation internally
I am looking for a starting back of the envelope calculation to determine if an aluminum box with just free convection can dissipate 3.7W of internal heat generation or if I need to think about adding ...
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1answer
19 views
In a warmer/sunnier climate, window (or roller shutters) superior to curtains?
When -on a hot day- the sun is incident on a window covered from the outside by a closed window shutter, the resulting heat is absorbed by the layers of air surrounding the shutter, subsequently ...
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19 views
Wall temperature of pressure cylinder - Boundary condition
I have a thick-walled pressure cylinder, that transports fluid and experiences only internal pressure. During the process, the outer wall temperature is measured. And I have no clue about the inner ...
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1answer
77 views
Heat Transfer in Different Wire Configurations
I am trying to create a program which estimates the final temperature of a magnet made of copper wire. I have different configurations in mind, but I will start off with a straight square wire with a ...
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38 views
Can radiant induction heat thermally decompose wood
Is it possible to thermally decompose an indicator like wood in a induction heating container made of stainless steel if the induction frequency is low enough to heat the container about 1000°c.
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2answers
45 views
Powder form of material with high thermal transfer
The Engineering Toolbox presents a chart of "common" materials and their thermal conductivity coefficients. I'd read or learned some time ago that diamond was superior in this respect. The chart shows ...
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0answers
21 views
DIY Thermal Solution [closed]
What would be the best way to design a sealed computer containing a gas or liquid circulated by a fan/pump to cool the components? ( With a metal case ) Then the computer would not be susceptible to ...
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1answer
46 views
Conductive Heat Transfer calculation over time
I am trying to heat the oil in a 1/2 inch thick rectangular steel box by using an Insulated heated blanket covered on all 6 faces of the box, the working conditions of the operation are at -50 Celsius,...
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0answers
39 views
Flow of hot gasses around the pipe
I have the following problem: there is a copper pipe getting through a wooden wall. On one side of the wall (hot side), I have elevated temperature which is defined by radiation and convection. On the ...
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1answer
67 views
Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production ...
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2answers
222 views
Calculation for heat transfer rate / cooling capacity for air cooled solid
I have a pipe which is channeling air flow from a compressor with a known mass flow rate and temperature. I can adjust the mass flow rate (power setting) and measure the delta T for the temp of air ...
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1answer
69 views
How cold for lack of heat?
I know that on the moon, while the daytime surface temperature can be above 270° F, in the shade but a few feet above the surface temperature can get quite low. Wondering whether a similar phenomenon ...
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1answer
93 views
Thermal oil in Boiler not reaching desired temperature
The thermal oil Feroline U in Boiler is not gaining the desired temp of 240 Degrees. We have physically measured the temp using digital thermometer at a distance of 20 cm where the boiler temp sensor ...
3
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2answers
587 views
Use two passive CPU coolers on one single CPU?
I aim on building a silent, completely passively cooled PC, with no moving parts at all (I am aware that it is cheaper to go for an inaudible computer instead, using low speed fans. This is not the ...
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2answers
39 views
Thermal Conductivity? Units On a Data Sheet
I've been trying to find the value of thermal resistivity for some linear disc resistors. I know that Thermal Resistivity is the reciprocal of Thermal Conductivity but the thermal conductivity on the ...
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4answers
138 views
Rapidly cool a flue gas without water circulation
I am a newbie at this!!
For an experiment, I have a diesel generator that releases hot flue gases at 150-160 Degree Celcius.
I want the output gas to be at less than 75 degrees for a duration of ~ ...
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0answers
1k views
What is the gray-body emissivity value of air
Wonder if anyone would know what is the average thermal emissivity value of air relative to blackbody at near room temperatures? I am looking for that magical number between 0 and 1. Looked everywhere ...
2
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1answer
76 views
Insulator thermal resistance
I have a machine that has power output of 2750 watt, which is blasted to a insulator foam with thermal resistance of 2.1 m2 kelvin/watt where the insulator is 5 cm thick and it drives the heat into ...
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2answers
2k views
Calculating R-value from temperature differential
A home windows installation rep gave me a quote today and conducted the following temperature differential demonstration.
Alice pointed a heat gun (with a surface temperature of 165F) at the interior ...
3
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2answers
87 views
Winding a wire heating element after a few uses
I bought recently 10 meters of Kanthal A1 AWG18 wire, which is a type of heating element (FeCrAl alloy). I intend to make a coil out of it, but it's no use doing that right now, I need more of it for ...
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1answer
318 views
How thick do I need to make the insulation in my homemade furnace?
(This is probably a simple question, but I've been staring at it so long I'm not sure I know how to do it any more. I have an Excel spreadsheet with like 3 different ways to calculate this, and they ...
2
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3answers
71 views
Temperature of a material in a furnace
I am conducting few trials for checking the placement of a thermocouple on a valve for measuring the temperature of the valve and the material is an X45 alloy. You can see the slot taken on the valve ...
3
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2answers
243 views
Heat Loss in Typical House
I recently looked up the recommended insulation value for my area (7) and was surprised how much lower the wall insulation value was shown to be. As you can see it is almost a third of the recommended ...
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1answer
143 views
Most effective heat transfer in a vertical pipe with small top/bottom temperature difference?
What would be most effective way to transfer heat in the following situation?
Specific conditions: A vertical cylinder or pipe, 30-100cm long, 5-10 cm in diameter, heavily thermally insulated except ...
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0answers
44 views
Heat switch material
Sort of a general question, but does there exist or might there exist a sort of thermal switching material? A material that could be switched from a thermal insulator (maybe more of a thermal ...
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3answers
836 views
Does good electrical conductivity imply good thermal conductivity?
Typically materials which are good conductor of electricity are also good conductor of heat, and vice versa. Are there notable exceptions?
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1answer
47 views
Heat Transfer From Resistance Element to Metal Component
I have a device that produces heat via Nichrome coils. I want to heat another small piece of metal (in this case stainless steel) with those Nichrome coils. I need to reach 175 degrees C, and so far I ...
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3answers
79 views
Radioactive Materials to Energy AT HOME
Is there a way to use a radioactive elements (Americium in my case, but for demo, any radioactive material) to create a usable amount of energy (Power small LED?) AT HOME! Using materials that can be ...
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0answers
84 views
How are most sheet style nichrome-based heating elements constructed?
I have noticed that nichrome is a common resistance wire used for various heating purposes. I have seen it used inside what seem like glass tubes (like on an electric stove) and just floating in coils ...
2
votes
1answer
335 views
Convective heat transfer coefficient in finite difference method boundary conditions
Suppose there is a cubic material with an internal heat source ($\Delta q / \Delta t =$ Constant), and is immersed in a sufficiently large amount of water. Now I would like to use finite difference ...
2
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1answer
334 views
How can I determine the thermal conductivity of an open container?
I want to know the heat conduction coefficient of a cup in order to investigate why tea cools at different rates in different containers. I know the cup is mostly plastic and paper. How do I determine ...
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1answer
2k views
How to calculate temperature rise on AC induction motor in an evaporative cooler centrifugal blower?
A neighbor recently asked me if his evaporative air conditioner was running correctly because he felt the blower drive motor and it was too hot to leave his hand on it for long.
I was surprised to ...
3
votes
1answer
83 views
Relationship between thermal conductivity and reaching the steady temperature?
The diagram is for three materials with different thermal conductivities. I think number 1 is the material with higher thermal conductivity because it transfers the heat faster so it gets to the ...
2
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1answer
1k views
How can one make graphene cables?
You might see in this short, 2-minute video that billionaire Manoj Bhargava talks about creating cables from graphene to conduct heat from the underground sections of the earth to the surface.
But as ...
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5answers
2k views
Are there any materials known to be sound-insulating but thermally-conductive?
Are there any materials known to be sound-insulating as well as thermally-conductive?
Cost is not an overriding concern, but preferably costing "reasonable amounts" and much less than national ...
