Three seminars in Poland were successful events focusing on practical experiences with energy-efficient buildings in Sweden with Per Kempe from Projektengagemang. Per talked about the Swedish Building Code (BBR) regarding energy performance and verification. Furthermore he talked about practical implementation of BBR using the organization SVEBY. Per also gave some tips on installation systems in energy-efficient buildings such as dwellings and small houses. Per finished his presentation with interesting practical points from an energy-efficient building Väla Gård as Skanska Headquarters in Sweden.
Swedish Building Code (BBR) prescribes that the buildings should be designed to minimize heat losses, have low cooling requirements, and efficient heating and cooling, and efficient use of electricity. In BBR, the buildings are divided into residential and commercial types, where non-electric heating and electrically heated buildings have more stringent requirements for energy use. The requirements in BBR are valid for Atemp which is the area of all floors of the temperature controlled spaces, designed to heat to more than 10ºC, which is inside the climate shield.
In BBR, if the source of heating is above 10 W/m2 than it is considered to be electrical source of heating in Sweden. The total building energy use is considered as annual delivered energy for normal use consisting of space heating, comfort cooling, domestic hot water, operation of building services (pumps, fans, etc.) and other uses in buildings (lighting in common areas, elevators, etc.). In Sweden, the occupants electricity and energy use is not included, i.e. lighting, computers, printers, coffee machine, etc.
BBR requires that the building´s energy use should be measured over continuous 12 months (and completed within 24 months after the building is operational). The monitoring system should start as soon as the building is completed, in order to complete this task without any delays causing extra financial expenses. For this evaluation it is possible to use an average year correction and possible deviation of planned use of the building (interior temperature, domestic hot water use, ventilation, etc.), all must be declared in a separate study.
“The calculation and verification of energy use are linked to energy calculations which require lots of assumptions based on the real conditions in order to get more equal results between different bidders / contractors. To avoid disagreement between developers and contractors, which can result in law-suits, a development program SVEBY, was started by the building and real estate industry some years ago (www.sveby.org in Swedish).”