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9 votes

Is heating with candles economically and/or ecologically worthwhile?

A related question was asked on SE Skeptics - Is this tealight-flowerpot heater more efficient than just tealights? In the third answer, it is claimed the heat produced by one tea light candle is 0....
Fred's user avatar
  • 3,507
7 votes

What should I do with coal that I have been given?

Well, if you are really into it and quite handy, you could turn it into activated charcoal, and then add it to your soil! Grind it into small bits, heat it anaerobically, then introduce high-pressure ...
Jan Steinman's user avatar
6 votes

How to heat an isolated room

Water has a very high specific heat capacity, which means it can store a lot of heat for its weight compared with most other materials. If you want to warm something in front of the fire and then ...
Highly Irregular's user avatar
6 votes
Accepted

For overnight heating, is it more efficient to use an electric space heater in a bedroom or a whole house natural gas furnace?

In terms of energy-efficiency within your own home (i.e. when we ignore energy losses outside the home), it will almost certainly be more efficient to use the electric space heater. It will be close ...
410 gone's user avatar
  • 14.7k
6 votes
Accepted

Doesn't it make more sense to wrap hot sandwiches with the foil facing in?

The foil / paper lamination creates air pockets between the layers that retain heat. Also the paper side absorbs some moisture and oils to attempt to keep it from getting soggy
LazyReader's user avatar
5 votes

Most cost effective heated flooring?

It will depend on your local cost of fuels and of equipment. The most energy-efficient way to do it would be to have a ground-source or water-source heat-pump that fed your under-floor heating. ...
410 gone's user avatar
  • 14.7k
5 votes
Accepted

Will a warmer climate reduce energy demand and increase solar PV production?

tl;dr -- For the west coast of the U.S., a 20% decrease in heating demand and 18% increase in cooling demand results in a 5% reduction in carbon emissions from electricity and natural gas usage Here'...
LShaver's user avatar
  • 11.9k
5 votes

Will a warmer climate reduce energy demand and increase solar PV production?

Wouldn't it therefore be better to have a small rise in global temperature? No. The radiative forcing by carbon dioxide does not increase solar radiation that can be captured by solar cells. The ...
juhist's user avatar
  • 5,099
5 votes
Accepted

Keep my hands warm while working on a laptop?

I use a pair of wool fingerless gloves. They don't impair dexterity and even though they leave fingers exposed they cover enough that my entire hands remain comfortable.
Jean-Paul Calderone's user avatar
5 votes
Accepted

What makes swimming pool heat pumps unsuited for home use?

There are a few factors here: Temperature range. Domestic heating water ranges from about 90 F (35 C) to 140 F (60C) The latter is used in radiators and fan coil heat exchangers, the former used in ...
Sherwood Botsford's user avatar
5 votes
Accepted

Flying vs heating and cooling

Firstly, you have to notice that heating is not optional, it's mandatory. If you leave a home unheated, the water pipes will freeze. So you could perhaps reduce half of the heating bill. Where I live, ...
juhist's user avatar
  • 5,099
4 votes
Accepted

Can a household's organic waste alone produce enough methane for its own space heating?

Let's see: This paper states numbers for organic waste production from 0.14 - 0.32 kg/ person day for developing countries. Elsewhere it is said that the total amount of organic wastes differs little ...
mart's user avatar
  • 2,846
4 votes

Most cost effective heated flooring?

The most cost effective and energy efficient heat is the heat that you don't lose through the envelope of your house. Look at the whole house system and consider whether improving insulation (in the ...
Jean-Paul Calderone's user avatar
4 votes

How can I decarbonise my domestic heating, given severe physical constraints?

The glib answer is to use less energy. The best way of doing that is fixing the fabric of the house - massively increasing insulation, massively decreasing air permeability (and as a result fitting ...
Dan Gravell's user avatar
4 votes

better to heat house with gas or with electricity?

If you have access to electricity that comes from renewable sources (sun, wind, hydro, waves, biofuel) or from nuclear, then I would recommend getting a heat pump. Simply said a heat pump takes energy ...
Thomas Bjelkeman's user avatar
4 votes
Accepted

Can the heat generated in a data center be used to heat households and offices?

Yes, when the data center is located near heating loads The U.S. National Renewable Energy Lab in Golden, CO features a prime example of this, at the Energy Systems Integration Facility: With heat ...
LShaver's user avatar
  • 11.9k
4 votes
Accepted

What is the most efficient setting on my oil-filled radiator?

Efficiency of the heater Like most space heaters, an oil-filled radiator uses resistive heating, which is greater than 99% efficient at converting electric energy to heat. But there are a few other ...
LShaver's user avatar
  • 11.9k
4 votes
Accepted

Direct Electrical Heating

There are three forms of heat transfer: conduction, convection, and radiation. Physically, there is no such thing as "direct electrical heating". The most "direct" way to convert electricity into ...
gerrit's user avatar
  • 2,649
4 votes

Is it possible to use sand for heat insulation at walls?

Even though rock is a poor heat conductor for example in geothermal wells that slowly become cooler over time as heat is extracted, you cannot use sand as a general purpose heat insulator in houses. ...
juhist's user avatar
  • 5,099
4 votes

Can a compact compost heat recovery system reduce the usage of fossil fuels on household heating?

Reduce yes. Reduce markedly, no, unless you live in a passive house. A normal human eats about 12 megajoules per day. If waste food is at such a high level as 3 megajoules per day (most people on this ...
juhist's user avatar
  • 5,099
4 votes

What kind of lenses used for eyewear doesn’t melt in the oven?

I suspect anything made from plastic could be damaged, but true glass lenses should be fine. Borosilicate glass, used in optics, has a glass transition temperature of 500 degrees Celsius. Because the ...
juhist's user avatar
  • 5,099
3 votes

How can a rocket mass heater be combined with a tight modern construction?

It's probably not the answer you want to hear, but no sensible options exist for running a RMH inside of a tightly sealed building. At least, that's the case if you are talking about the ...
Tim's user avatar
  • 2,844
3 votes

Are all Peltier-type stove fans the same?

Given that the 'efficiency' of Peltier/Seebeck/thermoelectric systems is very, very bad — even under ideal conditions — if one manufacturer comes up with a low-efficiency design, you are effectively ...
Tim's user avatar
  • 2,844
3 votes

How can I vent smoke from a non-rangehood stove without losing too much hot air?

Not all "range fans" blow the air out of the house. We discovered after decades that ours does not. It has filters and the air just comes out of the sides and right back into the kitchen. You might ...
Kate Gregory's user avatar
  • 1,955
3 votes

What is an energy efficient way to get fresh air indoors during winter?

Simple Answer There is a simple answer that does not require significant modification to an existing residential or commercial building. This is the standard high efficiency HVAC answer to the ...
Douglas Daseeco's user avatar
3 votes

Should I use my wood fireplace?

Be careful with wood fireplaces — most emit A LOT of very bad particulate matter! Burning wood in a common type of stove may result in more particulate matter than a diesel truck and may carry more ...
gerrit's user avatar
  • 2,649
3 votes

Temperature equalisation throughout the house

The story so far There are three different things that can cause an upstairs to be hotter than a downstairs, and you've mentioned each briefly in your question and comments: Convection. Hot air rises ...
LShaver's user avatar
  • 11.9k
3 votes

Can the heat generated in a data center be used to heat households and offices?

District heating requires infrastructure. In some countries, like Sweden, there is considerable district heating infrastructure, and adding additional sources of heat (such as a data center) is ...
gerrit's user avatar
  • 2,649
3 votes

Will a warmer climate reduce energy demand and increase solar PV production?

The US isn't the only land mass in the world you know. In much of Africa people and animals are dying in the heat. And on a global scale the man made energy requirements are rising exponentially ...
animartco's user avatar
3 votes
Accepted

Does painting an aluminum heat reflector make it useless?

Probably not. Reflection is a process that happens in the surface. Think about mirror. It reflects visible light. Now if you paint it, does it reflect visible light anymore? Heat reflectors are simply ...
juhist's user avatar
  • 5,099

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