7
votes
Accepted
Why are home geothermal systems usable anywhere in the U.S. but industrial geothermal plants limited in geographical use?
Because they're two completely different systems that have, in some circles, accidentally been given the same names.
The things that are sometimes (particularly in the USA) called home geothermal ...
- 3,771
5
votes
Where water goes in split air conditioner system in "dry" mode?
Split system air conditions (heat pumps) are refrigerator based systems. The two tubes you mention transport refrigerant from the compressor in the outdoor to unit to the indoor unit & return it ...
- 9,712
4
votes
Designing for a specific flowrate
Many commercial hot water recirculation pumps will do that. Just grabbed one at random - Grundfoss Alpha1 15 40 130.
I couldn't fetch the page after I ran their calculator. I used temp of 99C and ...
- 4,900
4
votes
A humidifier before a heater and after a heater
warm air can hold more moisture than cold air so the amount of water you can suspend in the air will change depending on where you install the humidifier.
Mounting the humidifier before the heater ...
- 4,781
4
votes
Accepted
Does a house heating system affect perceived and true indoor air humidity?
Your last statement is basically correct:
Another possible explanation is that the higher air temperature increases the air's water carrying capacity, which in the absence of an abundant water ...
- 1,991
4
votes
Accepted
Question about flow temperature and storage temperature in a cogeneration plant
when the cogeneration plant switches of upon reaching 85°C flow and without another heat source, there's no way to reach 95°C.
Are you sure the switch-off happens at 85°C flow, and not at 75°C return ...
- 4,781
4
votes
How does a residential storage tank water heater maintain water level?
Starting with an empty tank, the house plumbing is connected. Cold water source is provided to the appropriate fitting on the tank. Additionally, hot water exit is connected to those pipes installed ...
- 7,297
3
votes
is it possible to achieve 1000C temperature in a cabin?
If the heating element is constantly at 100°C, there is no way it can cause the room can get warmer than 100°C.
Otherwise, perpetual motion machines would be possible.
If you meant the heating ...
- 64
3
votes
What is the cost of heating of a 60k sqm building to 27 degrees celsius vs 20 degrees celsius?
This is a heat transfer problem
You can get a first order estimate by considering only conductive heat transfer, neglecting radiative and convective. Simplifying it even more, (again we don't know ...
- 330
3
votes
Accepted
Storage losses of a heat storage tank
Heat loss due to conductivity of the walls of your container assuming the ambient outside temperature,
$$ \frac{\Delta Q}{\Delta t*A}=-k \frac{\Delta T}{\Delta x} =C_{constant}$$
In the above ...
- 22.6k
3
votes
Accepted
Heat transfer coefficient of a cylindrical hot water storage tank depending on its size
In a tank with no fluid movement and no heat source with steady ambient temperature, the temperature of fluid are layered strata roughly in onion layers but favoring the top of the tank, meaning the ...
- 22.6k
3
votes
Accepted
Heating tape that has leads like picture below
When searching for 1100 watt heating tape, a number of returns match almost exactly the image you've provided. A few of the manufacturers provide NEMA separable molded plugs and also offer bare leads. ...
- 7,297
3
votes
Why isn't heat pump used for heating for most case
The last one is the reason furnaces are still nearly universal where temps drop down to below freezing. People will run an air source heat pump usually down to an outside temp of 40 F, at which point ...
- 4,900
3
votes
Accepted
Why materials with preferably a negative temperature coefficient for heating elements?
(I am putting this forward as a opinion to be validated by others more knowledgeable than myself).
I am not certain that the resistance will have the effect the original OP expected. i.e. I assume ...
- 24.2k
3
votes
Why materials with preferably a negative temperature coefficient for heating elements?
Hence, I wonder why one would preferably use materials with a negative temperature coefficient?
Most metals will have a positive temperature coefficient. Platinum, for example, is commonly used as a ...
- 10.9k
3
votes
Why materials with preferably a negative temperature coefficient for heating elements?
It really depends. If you have multiple heating elements (or areas within a single element), in parallel, they will end up at slightly different temperatures. If the application is temperature limited,...
- 1,551
3
votes
Accepted
Does it make sense to increase the thermal "dead weight" of a wood stove?
Several high performance houses with lots of insulation have been designed with wood stoves that are surrounded by lots of stone to give the thermal mass. Some are still giving out heat 24 hours after ...
- 15.9k
2
votes
Control power to a tungsten filament?
We have a test rig that works something like this, to heat up small objects (typically cubes of material with sides a few mm long) to about 1000C fairly quickly.
The heat source is a "tube" of ...
- 12.5k
2
votes
Natural gas boiler Vs. Electric Heater efficiency
I answered a similar question on SE Sustainable Living recently.
Before anyone (including yourself) can answer your question you need to supply some more information.
The first thing you need to ...
- 9,712
2
votes
Accepted
The air conditioner mechanism
An air conditioning system is basically a refrigerator, it passes air over a heat exchanger to cool it ie it injects cold air into a space, it doesn't 'suck' anything out'.
The water which comes ...
- 15.2k
2
votes
When heating a house, does the water flow slowly decrease as the difference in temperatures approaches 0?
A hot water based central heating system is fed by a pump and the only signal from the thermostat is heat/don't heat.
The temperature regulation is done by duty cycling the pump so that when the ...
- 6,101
2
votes
Hydraulic switch vs heat exchanger
Hydraulic separation in hydronic systems is generally more important with high flow resistance heat sources such as condensing boilers. If you don't hydraulically separate the heat source from the ...
- 571
2
votes
Accepted
Winding a wire heating element after a few uses
I have not used Kanthal, but I imagine it has similar properties to nicrome. Basically when you heat the wire up and cool it quickly, it quenches the wire. To reverse this process (or avoid it all ...
- 8,226
2
votes
Process fluid flow in a fired heater
It is just getting as much heat as possible.
Heat flows from hot to cold. The convection section is a much lower temperature. The convection section is basically waste heat in flue gas. The cold ...
- 489
2
votes
is it possible to achieve 1000C temperature in a cabin?
To answer the question the way it's asked
heating element of sort which is providing 100°C constantly but because room is totally insulated and shut can the temperature goes upto 1000°C or not ?
...
- 1,035
2
votes
Why not drive an air source heat pump domestic heating system with an auto engine?
Automotive engines have their own inefficiencies. If the engine runs at its optimum speed, expect to convert ~30% of the energy in the fuel to motive power, 30% to heat in the cooling system and 30% ...
- 746
2
votes
Will circulating air within a sealed ductwork system cause it to implode?
Would the pressures be the same with the fan On/Off? No.
The pressure in front of the fan would be higher than that behind it - that is to say, the pressure would be highest at A, and then drop ...
- 7,751
2
votes
Accepted
Will circulating air within a sealed ductwork system cause it to implode?
Closed or not, a fan will always raise the pressure in front of it, and lower the pressure behind it. In order for the ducting to implode you would need a relatively strong vacuum. What is needed ...
- 151
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