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Questions tagged [thermal-radiation]

23 questions
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Effects of Solar Shield on Electronics Enclosure

I am designing a prototype of an electronics package that will sit out on a pole in the sun 24/7 with a max ambient temperature of 50˚C and at 30˚N latitude. It produces 50W of internal heat and the electronics are rated to 70˚C. …
Shea
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Trapping sun heat the most - greenhouse

Greenhouse have recently caught my attention lately, which yesterday I posted in Why greenhouse's inside temperature never been infinitely hot? From what I understand recently, greenhouse gases traps the sun heat (infrared radiation) on earth, by…
gijoe
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Do infrared heaters have a special blackbody radiation specturm?

There are many infrared heaters on the market, that I would put in 3 categories, filament in quartz tube, filament in ceramic, and carbon film (for flat panel heaters). They all claim to be "infrared heaters" however, as far as I can tell, they all…
Manu de Hanoi
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Do the tubes of an automotive radiator flow in parallel or series?

The radiator in my car is damaged. One tube has a severe gash in it. I need to drive the car about 100 km before I can get a replacement radiator installed and coolant drains too fast to reasonably refill the cooling system every so often (with…
Jacob Marciniec
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Calculate FTIR-system response functions from measurements of a calibrated black body

I need to find the response of my FTIR spectrometer. I do have a calibrated black-body source (area-emitter) which I measured at various temperatures. The system operates in inverse cm, cm-1. My approach so far was the following: 1) Measure spectra…
bebissig
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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 cold side I have ambient temperature, again…
blackarrow
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How to calculate the thermal conductivity of a composite material

Very new to thermal conductivity calculations, so I'm aware there are already queries on here that may cover this, but I'm struggling to apply them to this instance. I'm trying to calculate the U-Value of a composite material. The data I have is the…
dhumphreys
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Can a steel plate reach -20°C due to radiative cooling when the ambient temperature is 2°C?

Conditions: there is a steel plate insulated at the bottom and facing the clear night sky, the ambient air temperature is 2°C, the cosmic microwave background radiation is 3K, and the convective heat transfer coefficient is 10 . My job is to…
mia
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Levitation melting tungsten

I want to melt some tungsten powder and cool it into small solid pieces of tungsten (around 10-50g). Because of tungsten's high melting point, it's hard to find things to hold it in. I had the idea of using levitation melting. I found a paper on…
LostXOR
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Removing air from voids plastic powder

A cylinder contains a powder made up two substances - spherical grains of metal and spherical grains of plastic. In between the grains are voids, so that the cylinder is made up of 75% powder grains and 25% air. The cylinder is oriented vertically.…
EddieP
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Thermography - objects appear hotter than they are

recently I started working with IR thermal camera (Hikvision DS-2TD1217-3/V1) and I have a slight problem. The camera works fine when there are only people in the image, however if I place a hot coffee mug in the image, suddenly everybody has 80…
user29106
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Melt plastic powder bed with radiant heat?

I want to melt a bed of plastic powder so that the powder bed once melted and then cooled forms a solid sheet of plastic. In order to melt the powder I'm thinking of passing a nichrome (Ni80/Cr20) wire over the bed without the wire touching the bed.…
Somanna
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How to calculate the volume of air required to keep electrical box cool?

I have a steel electrical box that is 15 cm x 15 cm x 10 cm. 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 limits the temperature rise to 2 $^\circ$C/W,…
Wise Shepherd
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Mount thermal imaging camera on ordinary optical microscope?

Anyone tried mounting thermal imaging camera on ordinary optical microscope? I know it is unlikely to work. Because of different refraction index and possible absorption of IR radiation by the lens.
somebody4
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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 can be observed if a vaccum is created around an…
GGizmos
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