T ° drop of the thermostat at night: still in debate ...

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T ° drop of the thermostat at night: still in debate ...




by Christophe » 21/01/13, 18:25

A little interesting article on the interest of lowering the heating temperature in case of absence (or at night) ... ralalala and say that some still doubt .... (even some old heating ...)

http://www.terraeco.net/Faut-il-eteindr ... 47838.html

There are fans of "off everything" as soon as you go under the duvet or go for three races. And those who come out of an old lesson learned we do not know where: "We do not cut the heating, we lower it. But the truth in all this?

"It depends on the inertia of the building, responds, mysterious, Julien Bouron, energy advisor for the Nantes association Alisée. If you're in a heavy building, with big thick stones, you're going to have a slow change in temperature. In this case, we can cut everything. Same opinion from the Agency for the Environment and Energy Management (Ademe): "If we have a very well insulated house, we can afford to switch off during the day, if it is poorly insulated, rather no, "says Florence Clement, head of consumer information. Or in a more classical building, which would be neither cork nor heat colander? "The rule that you only cut the heating after two or three days of absence is probably the right one," continues Julien Bouron. Otherwise, better just go down.
Do not go down below 14 ° C
Why is that ? Because when it's chilly, a house tends to cool very quickly. And after ? "There is a risk of heating all the way in when you come in and you will have a tendency to simply go down when you have a feeling of warmth, at a time when you will probably have gone far beyond the temperature of comfort and consumed a lot. It is better not to go down below 14 ° C, otherwise the house will be very difficult to heat up, "says Florence Clément. Conversely, leaving the thermostat as high as possible can make the bill go up: "Heat loss is related to the difference in temperature between the outside and the inside. A building heated to 16 ° C will cool down less quickly than a building heated to 19 ° C, "continues Julien Bouron.

16 ° C? 19 ° C? What are these temperatures that come back constantly in the mouths of experts? They correspond to the comfort temperatures set by the ADEME in its guides (see the chapter: "Managing your heating and hot water well"). "19 ° C in the living rooms, 16 ° C in the bedrooms". The problem is that comfort does not only depend on the temperature of the room. "You may be in a situation of discomfort at 22 ° C if there is a big difference in temperature between the heated air in the room and the temperature of the wall. If the wall is poorly insulated and it is 14 ° C, it will return cold radiation and therefore a feeling of cold, "says Florence Clément. "It also depends on everyone's metabolism. Seniors or young children will not be in a comfort situation at 19 ° C. Other people will be very good at 16 ° C during the day, "continues the Alisée specialist. 19 ° C is therefore an indication. But aiming at them in any case an advantage: to go from 20 ° C to 19 ° C would save 7% of energy still according to Ademe.
Clean the boiler and redo the window seals
What else can be done to lower the bill? Clean the boiler: "It must be cleaned at least once a year. And casings of wooden appliances cleaned twice a year. It's safe, since it avoids fire problems. And it improves the yield, "says Julien Bouron. The most ambitious will change their old boiler altogether for a new one. "The boilers of today are very efficient compared to those of twenty years ago, comments the specialist Ademe. In particular condensing boilers that recover some of the energy of the gases released to heat the water. "If we have windows leaks and we are renting or we can not afford to change them," we can at least redo the joints. We can not let the cold air seep in like this. Ditto for the doors that can be isolated. And the curtains: "They will serve mainly to reduce the cool radiation, so the discomfort. "But above all, there is a technique well known to southerners who uses it for the opposite effect:" In times of extreme cold, we can keep the shutters closed, says Florence Clément. It helps to keep the heat of the habitat a little more. "
Last edited by Christophe the 21 / 01 / 13, 19: 04, 1 edited once.
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by Christophe » 21/01/13, 18:29

As a bonus and to show the interest of lowering the T ° nocturnal or in case of non occupancy, here are statements of T ° an audit that I am doing (circuit 1 = T ° start boiler).

We can see the lowering of T ° for the weekend and the rise on Monday morning:

Image

In some cases we can go lower than 14 ° C ... everything depends on the inertia of the building, its insulation and the lift power in T ° ... as long as the T ° of comfort is reached during the occupation is good!

Lowering the thermostat T ° is several hundred L of oil / gas saved per year!
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by cortejuan » 21/01/13, 21:50

Hi,

I had two heat pumps, the first worked 24 years ago. At the time, my heating specialist had told me that we should not touch the beast, that lowering the night was useless because the morning, it was necessary to heat more, in short, it worked at a constant temperature, but 24 years.

My new pump includes a nighttime drop option (I think 2 degrees) it does not generate any gene and it saves energy especially since the night the cop is usually worse than the day.

When you get up it's good, you only realize the decline when you go out at night and you come back late ... So it's a great idea overall.

I may even go down a little more in temperature ...

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by Christophe » 21/01/13, 22:15

Yes -2 ° C is a fair bit, you can do a lot better (-5 or 6 ° C) especially if it's heating air blown (very fast heating).

Info: now the boiler regulators (from a certain level of quality) calculate themselves at what time to start the heating ... by simply entering the time at which we want the day T ° is reached !
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by cortejuan » 21/01/13, 22:48

Hi,

I will go slowly in my changes. Regarding my installation, I heat by means of aluminum radiators large area so exchange rather fast.

My system is less sophisticated than the one you describe: I program the day and time and I can decrease or increase the temperature over a wide range (-10 to + 20 degrees).

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by Alain G » 22/01/13, 08:03

To think that lowering the temperature will reduce the bill is utopian because the load on the network implies to increase the capacity of the network, we imagine pretty well the result of all the heating system that starts at the same time and the huge demand to 5 : 30 in the morning to catch up with the lost temperature.


A higher capacity of the network means higher price to compensate for losses in dead time or less busy.

So the exchange is better to pay more for the kilowatts by reducing our comfort or pay less for this kw while keeping this comfort?

More and more electricity suppliers are monitoring and charging on the basis of the peak consumption that makes them lose $$$ because they have to invest for surpluses that do not earn like the constant kw!


So think well unless finally we can implement an intelligent network connected with devices that can consume during troughs which will give a cost / benefit superior to suppliers!
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by Christophe » 22/01/13, 09:19

Alain your remark is valid only in electric heating and in the case where "everyone" would heat with electricity ... I know that you have almost that in Quebec ... here it is oil and gas in priority for individual houses ...

And thermally, whatever the heating mode, lowering the night setpoint (or absence) is advantageous ...
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by manet42 » 22/01/13, 12:07

A little lesson on this question:

http://labo-energetic.eu/fr/labo/boite_ ... 87c2fb6035

I reduce the night by about 2 °..it saves money, the amount of pellets used is less than without reduced.

JC
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by Christophe » 22/01/13, 12:19

Thank you Manet, everything is summarized in this picture:

Heating power = f (delta T °) if delta T ° then necessarily decreases the necessary power thus decreases the energy consumed ...

Image
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by cortejuan » 22/01/13, 13:50

Hello,

I understand Alain's reserves, but even in the case of electricity, the overall night-time saving can be significant. The problem of simultaneously starting all the installations using the night-time reduction is partially compensated by a graduated recovery, (c This is the case with my pump), well, as the document provided by manet says, it is better to have a well-sized installation to prevent the system from lagging to bring the temperature back to its normal value.

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