Questions tagged [heating-systems]
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What is this thermal insulating material?
I need to thermally insulate measurement chamber heated to 70°C. Material used for this task needs to be also electrically insulating. I tried various materials, but result was always clumsy and ...
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Need advice on building small incubator
I need to build an incubator that can vary temperature between 32 degrees and 36 degrees Celsius with discreet or continuous control. It needs to be made with perspex. It needs to be a two chamber ...
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How does a residential storage tank water heater maintain water level?
How does a residential storage tank water heater maintain its water level?
This seems like a simple question, and I would expect to see two float valves, one at the bottom to prevent the heater from ...
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Which are heated more by induction heating, magnetically soft or hard materials?
The title says it all. I'm trying to find the best alloy to create heat in a part of an invention.
Thanks.
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What is the most common control method in Underfloor heating?
I am trying to research the common methods on an underfloor heating system that are available in the market.
I know there are usually,
On/Off control to control the flow of water into the pipe
...
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Running heat pump extra mid-day worth it?
I have a home with a heat pump on the south-facing side of my home, so it gets sun all day. I let my home cool off to 62℉ at night, and at 6 am, when it is usually the coldest outside, I warm my home ...
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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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Best way to create separate heating zone for basement
I have 2 heating zone in the house: one for the upper floor and one for main and basement. Both zones split from the main duct into their own ducts and use a damper to close/open.
Now I want to ...
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What is the maximum temperature that could be achieved by a heat-pump and will it affect its efficiency?
I did some research and found out that one of the applications of a heat pump is as a water heater which means that it could achieve a temperature of about 100-degree Celsius.
Will changing the ...
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Why isn't heat pump used for heating for most case
Heat pump cost 2-4 times lesser of energy to heat than non-heat pump heater, then why are non-heat pump heater still very common ?
(1) At home, boiler and water radiator is used.
(2) For district ...
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Does fog affect the efficiency of heat pumps?
Aggregate changes require way more energy than temperature changes. I vaguely remember that it takes about the same engergy to get water from 5°C to 80°C as getting ice to 1°C warm water.
Hence my ...
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Central Heating And Radiator Use
This question is related to a 5 bedroom property, with a radiator in each room. Whereby heating is turned on/off in bursts of 2 hours (2 hours on, 2 hours off). 3 rooms are used constantly and 2 (...
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Kanthal winding protection tube?
I have a kanthal wire wound around a D=4mm and L=15mm standard pneumatic tube to solve the problem of freezing one of the tube ports that is exposed to the outer environment (and hence can be clogged ...
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Carnot COP of Brine-water Heatpump
The maximum reachable efficiency for a heat pump can be calculated using Lorenz/Carnot cycle:
$COP = \frac{T_H}{T_H - T_C}$
Where as the $T_H$ is the target temperature and $T_C$ is the reservoir ...
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How to a convert a domestic gas C.H. Boiler to use Hydrogen?
What engineering changes are needed to convert a domestic gas boiler from running on natural gas (i.e. north sea gas) to hydrogen?
The UK government is currently planning on switching to using ...
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Which heating and cooking techniques can be developed and taught massively and quickly?
HYPOTHESES:
As an exercise in thought, let's take for granted some hypothesis:
Let's leave aside the "need for electricity" to focus on the need for warming up a house and cooking some food....
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Water through a Copper-Coil Heat-Exchanger: How much tubing will be enough?
I am making a hot-water tank for a boat. Within it will be a copper-coil heat-exchanger.
Because copper tubing can be rather expensive, I am trying to better understand the design beforehand, and ...
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Whats the advantage of variable speed furnace blowers?
I'm in the market for a new heating and air conditioning unit for my home. Most offer variable speed blowers and the more expensive models are equipped with BLDC motors, which seem overkill. I am ...
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Where water goes in split air conditioner system in "dry" mode?
In split air conditioners, there are two tubes connecting the indoor unit and the outdoor unit. According to the generic schematics I find online (like this one), they are part of the closed circuit ...
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heat accumulation tank: hot water IN from top or bottom?
should heated water from a wood boiler enter a vertical cylindrical heat accumulation tank from the top or the bottom?
mine goes in from the top and can barely achieve more than 60C, whilst the boiler ...
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Will Nichrome heating element react with steam?
I have a setup where nichrome heating element will be in contact with steam. Can it react with hot steam at 900 C? if it does, I can encase it in something like iron/stainless steel etc. If it doesn't ...
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Why not drive an air source heat pump domestic heating system with an auto engine?
Theses are my thoughts on the question. I can't find an answer to "why not?". It there something I am missing, or are auto manufacturers simply too focussed on cars only?
The automotive industry has ...
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What is the most appropriate set-up to pressurize air in a closed, confined space?
Assume that we have hot air in a confined closed space of 36 m^3. This hot air will be distributed trough a piping network of 500 m to be blown on trees. What is the most appropriate set-up to ...
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Optimal maintenance temperature and allowable drop for energy efficient hot water storage
I bought an under-sink electric boiler/hot water storage unit, for instant almost-boiling water. This device has an 'eco' mode, which broadens its hysteresis to 10 degrees C: it will allow the stored ...
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Calculation of the stored energy for a heat storage tank
There is a heat storage tank that is directly loaded from the top and the heat is also taken from the top.
The colder water from the heating circuit return flow enters the heat storage tank at the ...
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How to Calculate Change in Temperature Relative to Distance from a Heat Source
Just as the title suggests. I have recently conducted model human ear canal using a heated reservoir (water at consistent temperature) with silicone rubber tubing of all known geometric features. Many ...
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Calculating geothermal heat pump
So I need to calculate how big geothermal heat pumps I need for a building. Heat pump is used for heating and to heat used water.
If I know how many kW's are needed for heating the building and the ...
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Do infrared heaters have a special blackbody radiation specturm?
There are many infrared heaters on the market, that I would put in 3 categories, filament in quartz tube, filament in ceramic, and carbon film (for flat panel heaters).
They all claim to be "...
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How to vary, according to a given sinusoidal profile, the water temperature in a tank, independently of the temperature of the environment?
The water tank in Fig. 1, that is placed in a closed space, has a heat source inside (an experimental device) that liberates 20 to 50 kW of heat. However, the water temperature in the tank has to be ...
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Thermal oil in Boiler not reaching desired temperature
The thermal oil Feroline U in Boiler is not gaining the desired temp of 240 Degrees. We have physically measured the temp using digital thermometer at a distance of 20 cm where the boiler temp sensor ...
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For a given a molten metal (say copper), how do you determine the best material for a 3D printer flatbed? What about circuit board?
Suppose we had a 3D printer that can spew molten metal out of a 0.1mm hot nozzle and that we can control the heat at the last 5mm of the Tungsten hot nozzle's tip.
I'm wondering then how would you get ...
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What are the advantages of energy metering over volume metering for district heat systems?
This 1992 book suggests that volume metering (ie, simply measuring and charging based the volume of hot water delivered to an end-user) may be superior to energy metering (ie, measuring the actual ...
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Does it make sense to increase the thermal "dead weight" of a wood stove?
It is general practice to put a bucket of water on top of a wood stove to keep air humidity under control during the burning of the stove.
But, such a bucket is also bound to keep some more thermal ...
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Figuring out power requirements of pool heater elements powered directly by solar panels (panel efficiency & sun,evaporation, insulation, ), etc.)
EDIT 1:
firstly, thank you for the comments and the input
In this calculations the panels are already involved from the start as being the source (due to other connections to other systems when not ...
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Layman's thermal storage device
I am a software engineer and have hobbyist understanding about electronics, so this is something completely out of my scope. Just need to understand if my idea of thermal storage is practical at all.
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Is this HVAC design incorrect?
Pic for reference - any HVAC pros around?
https://i.sstatic.net/vMIGR.jpg
The return duct matches the supply duct width, but the intake drop looks so small in comparison. Do I need to get this fixed ...
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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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What is the efficiency of direct electric heating versus water heated via electricity?
I am attempting to keep plants warm in a greenhouse. Therefore, I assume that heating the soil should be most efficient, as that's what plants seem to care about the most (i.e. the temperature of the ...
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How to transfer air heat easily?
Assume two buildings, one which generates a lot of air heat inside due to electrical equipment running etc. The buildings are 20-25 meters apart. Some questions:
How can one easily transfer heater ...
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Momentary 250 Degree Celsius Air Heating Element
I am a complete novice and need some pointers for designing a heating element that will be installed in an air duct with 60mm diameter, to heat the air passing through it to 250deg C as fast as ...
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Why do heat pumps take more time to heat up a space than resistive heaters?
I was wondering why do heat pumps heat a place so slowly as compared to the resistive heaters?
(This thought just came to my mind when upon ironing my shirt the iron became hot quickly which is a ...
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Heating an uninsulated campground building with high ceiling and radiant floor in New England
We have a beautiful dining hall designed for summer camp use, which we want to keep warm enough for group activities in the winter. The chosen heat is radiant floor, hoping to keep temperatures ...
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Is controlling humidity more precise when calculating with relative or absolute humidity?
I have a tubing system where I need to precisely control relative humidity. All my sensors are giving me temperature [°C] and ...
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Does a photon impart energy on a surface (to raise its temp) if it goes THROUGH that surface?
Hi so I have this senior design project involving cooling human skin as it is irradiated by an infrared LED. Human skin not only is super absorbent to IR, but that IR goes THROUGH the thickness of it ...
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Use of Cast Acrylic sheets as glazing in a Flat Plate Collector for domestic water heating
I am designing a FPC for heating water. I was wondering about the feasibility of replacing the usual Low-iron tempered glass with Cast Acrylic sheets [owing to non-availability of the former where Im ...
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Comparing EPA emission limits between wood stoves and wood furnaces
Emission limits set by the EPA were updated in 2020.
Currently, "Wood-burning stoves" are allowed 2.5 grams/hour of smoke emission [1]. On the other hand, "Wood-burning forced-air ...
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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 ...
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Heat Exchanger Design (Log Mean Temp Difference or Epsilon NTU Method)
I am trying to design two heat exchanger interfaces (shell and tube) that transfers heat to and from an intermediate heat pipe. The picture below gives a general idea of the problem I am trying to ...
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Which uses less energy to heat a room: central steam heat, or a ceramic space heater?
My partner and I are having a friendly debate. We live in a walk-up style apartment building which has a radiator-like unit in the corner, which we believe is connected to some sort of central steam ...
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What temperature could be achieved when nitrogen is used as a refrigerant in the heatpump?
Well we all are familiar that nitrogen is used to achieve low temperature.
I was just wondering how can one determine the temprature that could be achieved when phase change of nitrogen is done from ...
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