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Questions tagged [thermal-radiation]

29 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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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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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 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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What are the design trade-offs between Parabolic Dish (Scheffler) and Parabolic Trough (Euro Trough) Solar Concentrators?

Two types of prevalent medium-to-large-scale concentrated solar thermal fields use: Parabolic trough or Parabolic dish Since 1986, hundreds of sites around the world have built arrays of Scheffler parabolic dishes, mostly in India. Since 1998,…
Michael Altfield
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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…
Miya
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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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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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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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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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Solar heat gain and temperatures for the design of a radiant cooling system for residential buildings

The parameters I got from EPW file are 1 Extraterrestrial Horizontal Radiation (Wh/m²) 2 Extraterrestrial Direct Normal Radiation (Wh/m²) 3 Horizontal Infrared Radiation Intensity (Wh/m²) 4 Global Horizontal Radiation (Wh/m²) 5 Direct Normal…
user47882
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COMSOL Muliphysics - CubeSat - Orbital Thermal Load

I hope you are doing well, I'm Working on project By using COMSOL to study CubeSat in (Obrital Thermal Load) Physics. I need to extract the data in table or graph for each face of the cubeSat in terms of (Heat Flux Vs Time).
Abo Ayman
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