Questions tagged [temperature]
The temperature tag has no usage guidance.
86
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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 ...
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1answer
39 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-...
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2answers
51 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 ...
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0answers
41 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 ...
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1answer
45 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 ...
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22 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?
2
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1answer
74 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
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4answers
185 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 ...
2
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1answer
90 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 ...
2
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1answer
65 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 ...
2
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0answers
44 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 ...
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1answer
129 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 ...
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3answers
307 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 ...
0
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1answer
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
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0answers
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 ...
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0answers
30 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 ...
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4answers
83 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 ...
2
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2answers
85 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 ...
2
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1answer
118 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 ...
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2answers
88 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 ...
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1answer
30 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 ...
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1answer
75 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 ...
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1answer
70 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 ...
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0answers
55 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 ...
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1answer
23 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 ...
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1answer
172 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 ...
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1answer
37 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 ...
0
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2answers
466 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 ...
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1answer
116 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 ...
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2answers
74 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 ...
2
votes
1answer
37 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 (...
0
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2answers
144 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 ...
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1answer
71 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 ...
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1answer
126 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 ...
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0answers
59 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?
...
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2answers
61 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, ...
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2answers
649 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, ...
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2answers
525 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?
3
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2answers
155 views
Can a chain of nested thermal heat pumps be used to to gain thermal energy out of the environment?
Assume the following setup:
...
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1answer
19 views
Heats affect on material permeation?
I know that heat affects material permeation (increasing it); but I have not been able to find much in the way of data other than biologically, on how it effects materials such as plastics.
Does ...
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3answers
93 views
Ventilation setup high sleeper night cooling
I have a high sleeper in my room (width 3,70m, length 4,50m, height 3,30m) consisting of one large plane (yellow) and one window (darker grey). The plance leaves about 80cm space to sleep. The door (...
3
votes
2answers
583 views
What does "+- %/K" mean?
On a datasheet, sensitivity temperature drift (TCs) is specified in %/K.
I read this as "the percent change per kelvin".
Is this is simple as this sounds, or is there a reason for using kelvin over ...
2
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6answers
389 views
How would you seal a hole in an HDPE container that's in -20C environment
I have a temperature sensor in a -20C freezer. The probe is going into a bottle filled with propylene glycol solution. I want to seal the hole where the probe is inserted into the bottle.
What's a ...
2
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1answer
223 views
Is a Home's Temperature Affected by Solar Gain Through Windows on Cloudy Days?
Do homes increase in temperature due to solar gain with curtains open if it's overcast?
In other words, Does having curtains closed reduce the temperature of the home on an overcast day?
In other ...
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0answers
14 views
Why does my piezoelectric actuator stick at low temperatures?
I use a piezoelectric actuator on an experimental set up. At low temperatures (Lower than 0 Celsius), the piezo will freeze. Meaning, it will actuate about half way, and then stop moving. Other than ...
3
votes
1answer
132 views
Would creep have been a major problem for pykrete designs?
During world war two the British had plans for an aircraft carrier made of pykrete (a mixture of 14% sawdust or wood pulp and 86% ice.) the idea was to have a refrigeration system to stop the ice from ...
3
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1answer
79 views
Store seeds at 1°C
I have prunus pits that I stratify in a refrigerator during winter.
Normally, the seeds germinate in springtime, which is ideal.
However, often some of the seeds germinate prematurely. When this ...
4
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3answers
106 views
Prolong frozen ground conditions (to trick fruit trees into flowering later)
There is a common problem with fruit trees in temperate climates where the trees flower before the last frost. Generally speaking, if the tree has flowered, and the temperature drops below freezing, ...
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1answer
31k views
What's the difference between aircon modes Auto, Sun, Snowflake?
Most air conditioners have three modes: Auto, Sun, Snowflake
What is the difference it terms how it works?
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1answer
67 views
Thermistor - Steinhart-Hart Coefficients
In order to identify Steinhart-Hart coefficients for a thermistor, three known temperatures may be used to find three resistances.
What is the best way to choose these temperatures to calibrate ...
