Questions tagged [temperature]
The temperature tag has no usage guidance.
98
questions
0
votes
1
answer
17
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 ...
2
votes
2
answers
47
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 ...
- 23
0
votes
1
answer
55
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 ...
0
votes
1
answer
23
views
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 ...
- 3
0
votes
2
answers
54
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 ...
- 101
0
votes
0
answers
27
views
Effect of air flow speed on thermal time constant
Suppose a simple case : A fan blows air on a rectangular object made of aluminium. If you need to add some dimensions to the object, do not hesitate
The air speed is at X m/s and the air is flowing ...
- 103
0
votes
0
answers
35
views
What tool (numerical/simulation) can help me with this problem on liquid/gaseous nitrogen in a cylinder?
I hope everyone's doing well.
I was wondering what kind of tools (numerical/simulation, and perhaps the corresponding equations as well) can help me model this problem of liquid/gaseous nitrogen in a ...
- 1
0
votes
1
answer
35
views
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 ...
- 1
3
votes
1
answer
153
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)...
- 31
0
votes
2
answers
56
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'...
- 127
1
vote
1
answer
102
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 ...
- 127
0
votes
0
answers
17
views
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 ...
- 249
0
votes
3
answers
63
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 ...
- 123
0
votes
1
answer
110
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-...
- 105
0
votes
2
answers
69
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 ...
- 113
1
vote
0
answers
86
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 ...
- 111
1
vote
1
answer
78
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 ...
- 669
1
vote
0
answers
36
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?
- 11
2
votes
1
answer
160
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 ...
2
votes
4
answers
212
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 ...
- 121
2
votes
1
answer
211
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 ...
- 213
2
votes
1
answer
75
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 ...
- 249
2
votes
0
answers
61
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 ...
- 9,562
1
vote
1
answer
297
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 ...
4
votes
3
answers
348
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 ...
- 143
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 ...
0
votes
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 ...
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 ...
- 205
0
votes
4
answers
178
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 ...
- 109
2
votes
2
answers
112
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 ...
- 293
2
votes
1
answer
224
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 ...
Jorge Melendez
-1
votes
2
answers
127
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 ...
- 1
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 ...
- 113
0
votes
2
answers
174
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 ...
- 11
-1
votes
1
answer
166
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 ...
- 9
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 ...
- 11
1
vote
1
answer
36
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 ...
- 11
0
votes
1
answer
366
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 ...
- 111
-1
votes
1
answer
38
views
How can I establish as much airflow from my house to outdoors as possible?
I live in a small flat with all doors and windows sealed. The temperature outside is moderately cold. I assume the temperature in my flat is hotter because my body and the computer are emitting ...
- 111
0
votes
2
answers
591
views
What's the difference between thermocouple grade and extension grade wire?
We got a bunch of yellow thermocouple wire which the Omega web site says is type K extension grade wire. They also sell thermocouple grade wire which looks to be brown. What's the difference?
I ...
- 990
1
vote
1
answer
137
views
How do I determine the temperature inside a transformer vault?
I am trying to determine the temperature of an underground concrete vault buried 10m underground. The vault has the following dimensions: 2640mm x 5995mm x 2640mm with a wall thickness of 250mm. The ...
- 13
1
vote
2
answers
101
views
Cooling Down Fridge Encased in wooden box
I'm currently working on a project which involves a small fridge encased in a wooden box. It's designed for hotels and the boxes vary slightly, but one common trait is that the box has an open vent ...
- 13
2
votes
1
answer
50
views
How to calculate adiabatic air temperature loss caused by increase of humidity?
I'm searching for an approach on how to calculate the adiabatic temperature loss of air when increasing its humidity by a humidifier.
Assumed we have the following setup:
Air measuring position 1 (...
- 135
0
votes
2
answers
170
views
Save money with using a refrigerator correctly - blowing cold air to the back of it?
We are heating up our houses in winter to ex.: 21C to then have an insulated box inside the house, which we cold down to 5 and -15C, and we call it a refrigerator.. :)
The situation:
we would buy a ...
- 13
5
votes
1
answer
72
views
Easily compute a good approximation of heat conductivity of cooled semi-vacuum (water vapor + air)
I am preparing a classroom demonstration about heat, including a demo of how a satellite loses heat only radiatively, since it's flying through a vacuum. I'd like to make the vacuum-production ...
1
vote
2
answers
178
views
Epoxy that can withstand up to 800C and is optically transparent?
I'm looking to use an epoxy in a high-temp environment like 800C, and one that is optically transparent at 450nm (not below 90% transmission). But i'm having trouble finding one. It can be made of any ...
- 11
0
votes
0
answers
70
views
Tempreture distribution in a furnace
I am simulating a furnace as follows:
Is it possible to capture temperature distribution in this furnace without designing intake fan? Which kind of boundary conditions can replace with intake fan?
...
- 899
1
vote
2
answers
65
views
Is there an optical technology able to measure the temperature of dry air?
Optical IR sensors are able to measure the surface temperature of solids. But is there a range of the EM spectrum that can accomplish the same for measuring the temperature of nitrox (dry nitrogen, ...
- 248
2
votes
2
answers
682
views
How can we control the output temperature of a multi-input single-output pipe air-flow system?
I am trying to optimize the heat control of a test bench at our facility. The test bench is basically a pipe with an air flow that can be heated up to desired temperature. To heat the air flow up, ...
- 91
1
vote
2
answers
717
views
What happens when pumps are blocked off?
What will be the result if the pipe losses is greater than head produced by the pump?
What will be the result if outlet is closed?
- 11