forums energies: society, ecology and clean technologies

Most electric water heaters do not have serious insulation of the access hatches, most have a simple plastic cover with a hole to pass the electric supply. Can someone calculate the consumption of this hatch, which is about 20 cm in diameter and whose temperature is between 50 and 60 °? How many Gwh would be saved on the whole of France if this hatch were properly insulated?

if we take a conductivity of 0.3 for plastic with a thickness of 3mm, a room temperature of 15 ° we get 891Wh per year and by water heater
but there is still a layer of air ....

I didn't think it was so little. I thought at least 50w permanently by comparing for example to the surface of a central heating radiator which 2or 3kw with water at about the same temperature.

Hello,

Philippe Schutt wrote:a room temperature of 15 °

probably not anymore?

The exchange surface is small, hence the small result.
If the room is warmer, the loss will be lower.
The 5-6 cm of air between the tank and the cover also insulate, therefore a further reduction to be made.

What prevents you from stuffing a little rock wool in it? It is thermal insulator, non-conductive of electricity and non-flammable.

For my part, I have a boiler (150 liters) connected to my gas boiler. In summer mode, I connect the boiler to a timer so that it operates only between 3 a.m. and 10 a.m. I saw savings. It is a modern boiler without pilot light.

As an elephant I put rock wool. I am surprised by the result of philippe schut because a water heater consuming about 2 kwh / day in standby it seems to me that iron conducts heat better than polyurethane and I thought that a lot of losses would leave from this plate. 2kwh day is 730 kwh year. We can ask the question differently how not to consume these 2 kwh?

Raymon, where you get your 2 KWh / day, Philippe Schutt speaks of 891 W / h per year. (for the place we are talking about)

That said, it is not excluded that the boiler radiates 2 KWh / day even if we do not take water. It's a lot (2 X the consumption of a fridge) and you have to ask yourself several questions:

what is the volume of the boiler?
what is its T ° of water?
household composition?
is it not possible to meet the consumption of hot water in the household by reducing the T ° of water?
is there not a way to reduce consumption by delaying the switch-on of the device as much as possible (eg 1 to 2 hours in the morning instead of 22 pm)?
what is the outside temperature of the boiler at the end of the heating period?

I had seen positive attempts to overheat the boiler, but I do not remember where.

Static losses are 2,41 kwh for a recent 300 l atalantic water heater:
http://www.easy-ballon.com/chauffe-eau- ... table.html

Raymon, where you get your 2 KWh / day, Philippe Schutt speaks of 891 W / h per year. (for the place we are talking about)

Yes these are the losses for the water heater but as the polyurethane insulates a little better than iron ...
The total daily consumption observed at my home or at my tenants is between 6 and 8 kWh day with water at 50-55 °.

A discussion on the performance of water heaters:
http://www.bricozone.be/fr/plomberie/t- ... 55666.html
89% yield result.
I don't know how to put the APER doc in pdf it is on this page:
https://www.google.fr/search?client=ubu ... 2085251707