Questions tagged [thermal-radiation]
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15
questions
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40 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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2answers
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 ...
3
votes
1answer
95 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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0answers
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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1answer
81 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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votes
2answers
76 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 ...
4
votes
2answers
162 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 ...
1
vote
1answer
18 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) ...
2
votes
1answer
29 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 ...
1
vote
3answers
125 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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1answer
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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0answers
416 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.
2
votes
0answers
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 ...
1
vote
1answer
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 ...
