In Norway, a radiator is sufficient for one floor


Ενα μόνο καλοριφέρ αρκεί για να ζεσταθεί ένας ολόκληρος όροφος στην πιο «εξελιγμένη» κατηγορία ενεργειακών κτιρίων

A single radiator is enough to heat an entire floor in the most “advanced” category of building energy
A single radiator is enough to heat an entire floor in the most “advanced” category of building energy
Proper insulation of houses to save energy and reduce greenhouse gas emissions has become the norm in many countries, but in Norway has been reduced at other levels.

In the cold country of the north, the energy requirements of many new buildings is extremely high and, as seen, not just perform, but sometimes … overdo it, as many Norwegians complain that indoors the prevailing extreme heat. Trying to find the “golden mean” between the correct doses of warmth and energy saving a group of scientists studied the matter and reached a rather impressive results. It found that the buildings are very well insulated single radiator is enough to heat an entire floor!

The “passive houses”

The study specifically focused on the more “advanced” category of building energy, which is known as “passive houses” or “zero emission buildings» (zero-emissions buildings – ZEB). These buildings are “super-insulated”, thus dramatically reduce both the energy consumption and the efficiency of the heating system. Researchers from the Norwegian University of Science and Technology (NTNU) and SINTEF, the largest independent institute of Scandinavia surveys, wanted to examine thoroughly not only the energy performance of passive houses built according to zero-emission buildings standards in Norway (these include among others insulation extremely high standards and a reduced number of radiators) and whether their residents were happy with the “internal” the temperature.

“Our goal was to find a good balance between energy efficiency and user satisfaction with the temperature and comfort,” said a press release Laurent Georges, professor at NTNU Department of Energy. “With only one radiator per floor you would expect that people would feel that in rooms where there is no radiator is cold, but we found the opposite. The general thermal comfort in residential areas was good. The problem was more that those who prefer their bedroom is cold thought that the bedrooms were very warm. ”

Simple heat distribution

The scientists studied two apartments and two residential buildings with a common wall made according to Norwegian standards for zero-emission buildings. Originally they made measurements to record the temperature of the air flow and the environment in the areas of each building and the air induction and heat recovery to them, while also interviewed residents. Then did simulations of buildings on the computer to adjust the temperature in the best possible way and to satisfy the desires of the inhabitants in all rooms.

The heating method chosen to implement known as a simple heat distribution. And, as noted, it is entirely satisfactorily reached with a radiator in each floor – in conjunction with a well regulated ventilation. “The design of passive houses exempt from the streams coming from the windows and from the cold exterior surfaces of the walls. Thus, no need to put someone a radiator in front of each window. Indeed, because the air supply is thought to distribute more evenly the temperature in all rooms, only one radiator for several rooms or a radiator per floor. ”

Heat in the bedroom

Passive houses for some however have one drawback, and that is precisely uniform temperature throughout. “Many participants in our study complained that their bedroom was very warm. Norwegians usually want cold bedrooms below 16 degrees. And this is not done without opening a window, even if you have closed the bedroom door all day, “explained Maria Justo-Alonso from SINTEF. “Unfortunately, this method of adjustment of the room temperature (Ed .: the opening of the window) has a significant impact on the heating needs of the entire house.”

The researchers studied various strategies to adjust the heating in different rooms, but as they saw this is not easy to achieve. At this stage of their research trying to find ways to be able to reduce the temperature in the bedrooms, without increasing the overall energy consumption of the house. At the same time, however, some recent studies show that this kind of central heating is probably the best choice in buildings for offices

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