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Questions tagged [temperature]

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Can you heat the air in a box to heat plastic inside box?

I am working on a project where I need to heat the air inside a box to heat up a 3d print inside it. As of now, I am using a heat gun to heat up the air. I was wondering two things: How can I add hot ...
user47393's user avatar
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1 answer
53 views

Creative way to get accurate temperature without $$$?

I am looking for a way to measure temperature to about +/-1F (or at least +/-1C) accurate around room temperatures (50F-80F). Currently I am comparing three different thermometers and the result is ...
divB's user avatar
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What effect does airflow rate have on heat dissipation if the initial heat varies proportionally to the airflow rate?

If I have a server rack consuming 10 kW of power in an empty room with A/C, what effect does the rate of airflow from the rack's exhaust have on the temperature in the room and the load on the HVAC? I ...
Chris's user avatar
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1 answer
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Can $R$ value be estimated by change in temperature over time?

Suppose a closed sphere with a hull and an $R$-value of $10$ m2 K/W and a radius of $1$ m. Suppose the temperature inside of the sphere is Ti, the temperature outside is To. The inside temperature is ...
divB's user avatar
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Techniques to measure / picture very low (cryo)temperatures

I am looking for an experimental technique to measure/create a temperature map of a small object (few mm diameter), like in terms of IR camera. However, all IR-cameras I encountered measured ...
Agnieszka's user avatar
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2 answers
56 views

Alternatives to ceramic PCB

I am looking for a way to create prototype high temperature circuits capable of going up to 500 °C. I know one way is to generate the CAD file and send it to a PCB manufacturer. Another way is to get ...
user1402154's user avatar
-1 votes
2 answers
41 views

Fundamental error when assuming "per unit Celsius" = "per unit kelvin"

While doing a chemical engineering question today, I came across something quite fundamental that I can't seem to get my head around. I had a value in bar/°C, and I had to multiply it by a temperature ...
R0berto's user avatar
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Is there such a thing as high temp magnet wire?

I understand that magnet wire is enamel coated, which can tolerate temperatures up to approximately 250 °C. Is there any other insulated wire that can be tightly wound into (1 inch diameter) coils ...
high temp coil wire's user avatar
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26 views

Is a candy/oil thermometer suitable for calibrating a soldering iron or hot air gun? Why/not?

Disclaimer: not sure if the question is on-topic here, but I'm not sure that any other community is better suited. If there is one, would you kindly direct me there? Background: I am looking into ...
Gregorio Litenstein's user avatar
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2 answers
26 views

Practical application: questioning the value of insulating a car battery

Living in the north, I am wondering if a sitting car battery's chemical reactions give off enough heat to justify insulating it. That is, will it result in significantly more power available to start ...
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Straight Thread Seal Performance

Is it possible for straight threads to create a hydraulic/mechanical seal without the use of o-rings or sealants? From what I've read, in the oil industry buttress threads are used, in my application ...
Danielle's user avatar
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2 answers
79 views

what is effect of temperature on dew point?

I read that relative humidity changes with change in temperature though there can be constant humidity. So, if RH is changing then dew point should get increase with increase in temperature? https://...
Rohit's user avatar
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1 answer
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Cooling steel by putting it in water ; what is the final temperature

Below is a problem I made up and did. I am hoping that you will tell me that my solution is right. Problem: A $5$g piece of steel at $30$°C is placed in $400$ ml of water at $20$°C. Assume that all ...
Bob's user avatar
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8 votes
3 answers
2k views

Steel expanding in a tight space

Hypothetical question: What would happen if I were to cool down a steel cylinder to make it contract, and then slide it all the way into a cylindrical hole in a room-temperature solid steel box? The ...
Ram Rachum's user avatar
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2 answers
52 views

How to 'normalise' the effect of temperature on pressure to determine an accurate leak rate

I want to determine the leak rate of a container. I pumped it with air and measured the temperature and pressure within the container. What I observed is that, due to fluctuations of temperature in ...
Pipistrelle's user avatar
2 votes
2 answers
62 views

What standards or industry guidance define a top temperature for human contact to surfaces?

I'm looking for guidance to define how hot is too hot when related to human safety. I have heard of a general limit from OSAH of 60 °C (140 °F) being ok for contact up to 5 sec. Are there better ...
things4fun's user avatar
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1 answer
176 views

Modeling 1D Transient Heat Transfer: Wall/Room interface

Consider a 1D adiabatic room (of volume V) with a wall conducting heat on its left side. The wall is solid and heat conduction in it is driven by the common heat equation. There is convection at the ...
Camille Chaize's user avatar
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1 answer
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Temperature measurement in a process pipe

I am going through a PID in which the line size was increased from 2 inch to 4 inch for temperature measurement and then decreased to 2 inch using two reduces. What is the need for reducers before ...
Navinmm's user avatar
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2 answers
81 views

Will hundreds of wood-burning fires damage 1/2" thick steel? [closed]

I have 1/2" and 3/8" thick x 24" diameter steel pipes that are typically used for natural gas transport, but in my case they take the shape of horizontal wood-burning cookers. I am ...
Behacad's user avatar
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1 answer
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What are the effects of temperature on optical fiber waveform

I am attempting to measure temperature using a signal through an optical fiber. If I send a waveform through an optical fiber, how would temperature affect it? I've looked here (Calculating ...
jcu's user avatar
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3 votes
1 answer
155 views

High Fan Speed Not Cooling As Expected (PWM, Arduino)

We have a system involving a fan blowing air through a box which contains a small (but constant) heat source and a temperature sensor. The fan speed is controlled with PWM. As PWM (and hence fan speed)...
Jago Aartsen's user avatar
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2 answers
69 views

Resources for strength calculation for an outside aluminium loft ladder and what about it becoming brittle in cold weather?

I have been thinking for years about building an outside stair / loft ladder to climb from a platform to another one, one stair higher (3 meters). However, I never studied material strength, and I don'...
Camion's user avatar
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1 vote
1 answer
573 views

Up to what temperature, can titanium be safely used?

I was thinking about the realization of a pottery oven, and I wondered which material I could to make the inner walls. Most often the inner walls seem to be made of some kind of hard mineral wool. I ...
Camion's user avatar
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Using an NIST Calibrated Thermistor Meter with uncalibrated or unknown probes

Background: I recently purchased a NIST calibrated thermistor meter for measuring temperature at work. This Digisense (20250-94) meter came from a seemingly reputable company, Cole Parmer, and we ...
user391339's user avatar
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3 answers
90 views

Why materials with preferably a negative temperature coefficient for heating elements?

As far as I understood heating elements make use out of Joule heating. Hence, I wonder why one would preferably use materials with a negative temperature coefficient, therefore? Isn't it, that, the ...
Ben's user avatar
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1 answer
215 views

Mollier diagram and reading the relative humidity when knowing the dry- and wet bulb temperatures

I initially put this one on the physics-side, but this might be a more appropriate place: https://physics.stackexchange.com/questions/666116/mollier-diagram-and-reading-the-relative-humidity-when-...
user2703642's user avatar
0 votes
2 answers
98 views

In what way does plating a bimetallic strip affect its displacement?

I've got a mechanism that uses a bimetallic strip; for aesthetic reasons I'd like to electroplate it with a thin layer of gold - how does this affect the relative displacement of a bimetallic strip in ...
T.S's user avatar
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1 vote
0 answers
127 views

Why is a throttling valve isenthalpic whilst a nozzle is not?

From my understanding, Nozzle's and throttling valve are devices which both trade pressure for velocity, so they increase velocity at the expense of having to decrease the pressure. If we examine ...
SalahTheGoat's user avatar
1 vote
1 answer
107 views

What does it mean by average kinetic energy of molecules as temperature?

We say kinetic of molecules as a function of temperature from the equipartition theorem. This means that more is the velocity or mass of the body , more the is the temperature. My Q is why does ...
S.M.T's user avatar
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1 vote
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48 views

Solidworks flow simulation temperature drop

Using Soldiworks flow simulation, I want to calculate the temperature drop of water (40 degrees) which flows in 10 m steel pipe. How should I manage Wizards setting and goal?
Robin's user avatar
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2 votes
1 answer
248 views

PV Diagram Pressure temperature volume increasing what is net effect on output?

I am not properly understanding this question. please help! Most of the process on PV diagram have this kind of curvature But in the question above, its bit weird. My thoughts: Pressure, temperature ...
Niranjan Wagh's user avatar
2 votes
4 answers
359 views

I want to dissipate 3 kW of heat with an air conditioner. How big of an air conditioner do I need?

So the title says it all. I have a room (4 m x 4 m x 2.5 m) which is closed.(Actually there is a window and I could add a 50 cm panel fan if needed as an exhaust if that will help.) I have some ...
papajo's user avatar
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2 votes
1 answer
412 views

Hack a kitchen freezer for lower temperature

Common home freezers usually have the lowest temperatures of about -24 degrees Celsius. Freezers that go lower exist but these are much more expensive (times much). I wonder whether a common kitchen ...
Kozuch's user avatar
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2 votes
1 answer
89 views

How can I trust a K-type thermocouple purchased from a no-name company?

I am doing some temperature measurements for reliability testing, over an expected range of 16C to 45C. I have an NIST traceable thermocouple thermometer (S220-T8), however it does not come with ...
user391339's user avatar
2 votes
0 answers
70 views

Lowest temperature at which a spring powered mechanical wrist or pocket watch will stop operating

In the Wired article 9 Russian Adventurers Mysteriously Froze to Death. A New Theory Explains Why, it is stated that: Without body heat to keep it warm, in such cold weather—estimated to be –13 ...
Fred's user avatar
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1 vote
1 answer
454 views

Kiln design, heating element holders

I intend to build a kiln in my free time over the next few months and am trying to avoid my past mistakes (heated too quickly, the kiln started cracking, the kanthal element melted and it was just ...
Semptum Valoris's user avatar
4 votes
3 answers
479 views

At which temperature and humidity should outside air be drawn inside?

I have a greenhouse that get’s mold in the winter because it’s to humid. I have now installed a heater and a ventilation system drawing outside air into the greenhouse. I wish to start the vent based ...
Tiptop's user avatar
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0 votes
1 answer
43 views

Glue a sample at -40 Degrees

I would need to stick two opposite edges of a sample on two small metallic plates (as it were a bridge). The sample is Silicon and on top an high temperure superconductor which is Temperature ...
Mickey Martini's user avatar
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0 answers
27 views

Networked Control

Considering the air conditioning system for three rooms B, A, and C. Room A is in the center while rooms B and C are on the left and right sides respectively. What is the coupling value (N) I should ...
Shoaib Muhammad's user avatar
1 vote
0 answers
31 views

Why does use with air or water reduce the maximum temperature of certain high temperature / pressure hoses?

This example is a Parker Hannifin model 426/436 "SAE 100 R1 AT / SAE 100 R16 High Temperature Hose". Here are the temperature specifications: (Full data sheet) Although there is an asterisk ...
StayOnTarget's user avatar
0 votes
4 answers
329 views

How to calculate Average temperature from area under the curve?

Let us say I have a graph of temperature against time for a material as shown here. I want to calculate the average temperature. Will it be simple mean of the curve or rms of the curve? Edit: The ...
scico111's user avatar
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2 votes
2 answers
160 views

How to calibrate an oven thermometer?

Is there a DIY method for calibrating thermometers in the 200 to 250 degree Celsius range? In a moment of boredom I decided to put all five of my wife's oven thermometers side-by-side in the oven and ...
ConanTheGerbil's user avatar
2 votes
1 answer
333 views

How you calculate the temperature scaling factor?

Used to obtain the corresponding pressure at ambient temperature. Example when testing Proof or burst pressure to a given value at 300°F, but you will test with corresponding pressure (higher) to ...
user avatar
-1 votes
2 answers
194 views

How to increase temperature in a wooden box up to 350 degrees F?

How can I significantly increase the temperature in a relatively medium sized wooden box effectively to 300∘ 𝐹? The box is 3.5 feet in height, 2.2 feet in width, and 9 inches in length. Also I put ...
Cam Sep's user avatar
1 vote
1 answer
31 views

What's the thermal bounds of a typical computer case fan?

I'm thinking of repurposing computer fans (case fans and/or CPU/GPU fans) for a hobby steam turbine project. So the idea would be to use the fan rotors in the turbine to drive the shaft (discarding ...
hexamon's user avatar
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0 votes
2 answers
252 views

Need help with reverse engineering a sensor

I have a pressure/temperature sensor for a vehicle, which I decided to tear apart to see exactly how the sensor works. This sensor as designed by the manufacturer it is meant to be immersed in oil to ...
Gh88's user avatar
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-1 votes
1 answer
216 views

Heat transfer for a copper rod

For a copper rod heated by a heat gun, why might the temperature of the rod continue to increase for a short time after the heat gun has been removed as the heat source? With reference to transient ...
Joe's user avatar
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1 vote
0 answers
57 views

I hope this is the correct forum for temperature related question

I have about (this is experimental) 0.75 to 1 liter of water. Ive found I can use 400W of power through peltiers to reduce water flowing through at 1L/minute from 32C to 20C in about 1 to 1.5 minutes ...
Paul Pease's user avatar
1 vote
1 answer
82 views

Demagnetize neodymium permanent magnets at < 60 degrees C

I have 10 cylindrical neodymium permanent magnets about 5mm in diameter, 5 mm long, embedded in a thermoplastic polymer. I want to demagnetize them without removing them, or heating them above 60 C ...
tzudoh nym's user avatar
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1 answer
792 views

How does indoor temperature factor in when determining ideal relative humidity in a home?

I am having trouble understanding how indoor temperature plays into what a healthy indoor relative humidity level should be. Most sources I have come across searching the topic online provide a range ...
Poosh's user avatar
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