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Direct underfloor heating in concrete floors from Danfoss, the DEVImat Deviflex
Posted by sparksdirect in ask Mr Sparks, guest expert, heaters, new technologies, technical data, underfloor heating, website update on December 12, 2011
The direct heating systems from Danfoss – the Deviflex DTIR range – require an installed output of up to 150 W/m2 and the heating cables are placed near the floor surface. Normally, heating cables or mats are placed in the lower part of a concrete layer with a max. thickness of 5 cm.
The direct heating system may be installed either as a total heating system or as a supplementary heating system. As a total heating system the DEVI system is the only heating system in a room. As a supplementary heating system the DEVI system supplements another heating system in a room, e.g. electrical radiators.
The total heating system is designed to cover the total heat loss and provide full heating while the supplementary heating system is designed to provide a warm and comfortable floor.
The Deviflex installed output
The installed output shows how many watts per m2 (W/m2) have to be installed in order to cover the heat loss and provide the necessary heating. The heat loss mainly depends on the climate conditions and the insulation in the building. We will assume that information about the heat loss is available.
When the total heating output for a room is to be determined, the available area (m2) has to be estimated. This means that the area covered by cupboards, bathtubs, lavatories, etc. has to be deducted from the total area of the room. Therefore, the required installed output will be proportionally higher on the usable floor space.
In order to ensure a quickly responding heating system, the total calculated output has to be increased by approx. 30%. The result of this calculation will reveal the required output for the heating element – cable or mat.
Normally, the calculated output for a new and well insulated building would be 40-60 W/m2 and up to 150 W/m2 in the bathrooms. If the calculated installed output is higher than 150 W/m2, we recommend that additional heating systems be considered.
In houses with large glass and door areas we recommend the use of rim zone heating. The installed output in a rim zone area is approx. 200 W/m2. For further information about rim zone heating, please refer to the paragraph “Accumulating heating”.
DEVImat – the product choice for under concrete floors
When DEVI’s underfloor heating system is installed as a direct heating system, the deviflex cables with a maximum output of 18 W/m should be used. Besides, the devifast™ fitting bands will ensure a quick and easy installation. Alternatively, the devimat (a pre-prepared cable mat) with a maximum output of 150 W/m2 may be used. When the total required output has been calculated, the cable with the nearest and higher output should be chosen.
To exploit the optimal comfort and economy of the system thermostats with simple or intelligent timers should be used – the Danfoss devireg 540 or the Danfoss devireg 550. You can browse the full offer of Concrete Floors Underfloor Heating Solutions from Danfoss – the DEVImat Deviflex system.
You are Invited to the DEVI Trade Day at Sparks Electrical on December 6th 2011
Posted by admin in ask Mr Sparks, customer service, electrical products, guest expert, in-house announcements, new technologies, promotions, technical data, underfloor heating, website update on November 24, 2011
If you are reading this article – and to everyone out there, those near and far, Londoners and non-Londoners – you are invited to the DEVI Trade Day! A DEVI Sales Manager will be visiting Sparks Electrical on Tuesday, December 6th 2011 at 9.00AM – come and meet him to discuss your underfloor heating requirements! RVSP the event – and come visit us on the 6th!
What can you find out at the DEVI Trade Day?
- You will see some product demonstrations on the day from the world’s leading manufacturer!
- The principle of the DEVImat underfloor heating system – how does it work – will be explained;
- You will see the new thinner, cooler, and cheaper new DEVImat underfloor heating solutions;
- You will be shown how things work with the new under floor DEVImats;
And… many many other things – bring your questions, enquiries, and requests!
Who is invited to the DEVI Trade Day at Sparks?
Everyone is invited! And by everyone we actually mean EVERY ONE! That is,
- If you are a customer of ours, or maybe you never bought from us – you are invited!
- If you live in Archway or North London or in London – you are invited to pop in and watch / ask / learn / have some tea and biscuits with us;
- If you are our twitter follower and we say a “good morning” once in a while to you – or if you are just a “listening” twitter friend, you are invited!
- If you are our Facebook friend or our fan on facebook for the Sparks Direct Electrical page – you are invited!
- If you are in our circles on Google+ or if you are our fan on the new Sparks Electrical Wholesalers Ltd page on Google+ – you are invited!
- If you are regular customer, coming in every morning at 8.00am or right before closing time at 4.58pm – you are invited!
And… everyone else – you are invited to see the presentation!
You are invited to the DEVI Trade Day at Sparks!
Here’s a picture of the poster announcing the DEVI Trade Day at Sparks Electrical on the 6th of December – right on the front door of our shop! You won’t miss it if you’re coming in or going out!
Devi and underfloor heating – benefits of the electric under floor heating
Posted by sparksdirect in all-time best-seller, ask Mr Sparks, customer service, guest expert, in-house announcements, new technologies, technical data, underfloor heating, website update on November 3, 2011
DEVI is of the Europe’s leading electric underfloor heating manufacturers and also one of the preferred partner of many of the UK’s leading housebuilders and developers, with sales companies in thirty countries worldwide.
Having been established for over forty years, the people at Devi have designed and installed underfloor heating in the UK, in projects ranging from large apartment developments, to single house applications. The way they do things is like this: they work closely with developers and architects, as well as with builders and electricians, and they show commitment to providing unrivalled project support from design through to installation and after-sales care.
Devi Electric underfloor heating – Your benefits
Invisible comfort
The electric underfloor heating provides a comfortable, efficient and economical alternative to conventional heating. The DEVI systems are also invisible, providing total freedom when decorating and furnishing.
The Heat Rises
The underfloor heating system installed under the floor radiates heat evenly across the whole floor area, providing maximum comfort levels; warm feet and cooler at head height, whereas traditional systems provide heat by convection; the hot air rises and leaves a mass of warm air at ceiling level, where it cools and returns as a draught.
An Economical Solution
Typically, electric underfloor heating makes it possible to lower the average room temperature by 2ºC without affecting the level of comfort. This means that heating can be reduced by around 20%, which is both an economic and an environmental advantage.
Capital cost savings
Once installed, there are no future maintenance costs or contracts to consider. There is also no need to channel emissions out of the building, which greatly simplifies the design process.
Health benefits
With electric underfloor heating, there are no travelling dust particles and no moisture content to support dust mites, which greatly benefits those who suffer from dust allergies and asthma.
Total floor solutions
DEVI strives to ensure that the installation process is as efficient as possible. In their own words,
Working closely with other organisations, we are able to offer a total solution for your project, encompassing the work of three trades; insulation, heating installation and screed. As well as providing one point of responsibility, this also means that the build programme can be streamlined in order to achieve the highest levels of efficiency.
Soon: coming out with NEW DEVI electric underfloor heating items, more flexible and less expensive than before! Keep an eye on our blog – the Devilink system (central controller, floor thermostat, and room sensor) is on its way!