Questions tagged [thermal-radiation]

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Can a lunchbox made from neoprene be as effective as one made from foam and aluminum foil at keeping its contents hot or cold over time?

Aluminum foil reflects radiant heat while neoprene doesn't. On the other hand, aluminum is highly conductive while neoprene is an insulator. So there must be differences in the way these two materials ...
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2answers
41 views

Why do we consider a wavelength range when defining spectral emissive power of a blackbody?

The spectral hemispherical emissive power of a blackbody is the amount of thermal energy emitted in the form of EMW lying in the wavelength range of $\lambda$ to $\lambda + d\lambda$ via thermal ...
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3answers
126 views

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 ...
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49 views

What are the factors I need to over/under estimate cost of heating in a box-like room? [closed]

For economic purposes, I am interested in studying the equilibrium of heat in a typical rectangular room from various sources, such as a classic radiator or vents. If I have a radiator sitting next to ...
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1answer
102 views

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 ...
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40 views

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 ...
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2answers
171 views

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 ...
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1answer
101 views

How much time to melt marshmallow under heat lamp?

Using the Specific Heat Formula, I found that I need to apply 612J of heat to melt 18g of marshmallow. Marshmallow has a specific heat of 2 J/(g*C), melting point of 98.6°F, and a starting room ...
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2answers
82 views

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 ...
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1answer
19 views

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) ...
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1answer
31 views

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 ...
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1k views

calculating the efficiency of a microwave oven

If I want to calculate the efficiency of a microwave oven, I have the input Energy (= power (watts) x time (s)) and the output which I measured using temperature difference (q=mct). So do I divide ...
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434 views

Heat Resistance of Melamine Particle Board

I want to make a cheap thermoforming fixture out of melamine particle board so I can form some PETG plastic sheets. The forming temperature ( hence oven temp) for thermoforming PETG is around 300 deg. ...
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1answer
25 views

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.
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43 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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71 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 ...