Norway Compliance Regulations: TEK17
TEK17 is the latest Technical Building Works Regulations in Norway that governs the properties and qualities that are mandatory for building works to be erected legally in Norway. Additionally, the Technical Building Works Regulations sets out requirements concerning the energy efficiency levels that must be met in the finished building works. Norway’s compliance regulations TEK17 addresses energy efficiency in building both through requirements on building’s total net energy consumption as well as the requirements on the elements’ minimum U-values.
According to TEK17, the general energy efficiency requirements are set according to the following principles:
- Buildings shall be designed and constructed such that satisfactory energy performance is facilitated.
- The energy requirements apply to the building’s heated gross internal area (BRA).
- U-values shall be calculated as the mean for the various elements of the building.
Accounting For Energy Efficiency in the Design Process
While Norway’s TEK17 requires detailed whole-building energy calculations to demonstrate compliance with maximum total net energy requirements, complementary and alternative prescriptive guidance is also provided. This means that considerations can be addressed from the earliest point in the design process and the building can be optimized. Requirements to establish and calculate end energy are such that it often happens late in the design process. In order to minimize late stage redesign to address issues highlighted when the whole building energy analysis is carried out, it is appropriate to consider the design of the façade in conjunction with other prescriptive guidelines provided by TEK17 on thermal performance and daylight factors.
These two performance characteristics need to be considered in conjunction with understanding passive solar heat gain to maximize heat gains to reduce heating loads, while also ensuring that the building do esn’t overheat to minimize cooling loads.
Managing Thermal Performance and Energy-Efficiency
TEK17 provides a prescriptive guidance to demonstrate compliance with the Energy requirements. These requirements include energy saving measures such as thermal performance standards for building elements for different building categories (Section 14-2 (2), 14-3 & 14-5) and in some cases includes limitations on the proportion of windows and doors to be used.
FenestraPro facilitates compliance checking with regards to these thermal performance requirements. It can also be used to establish the maximum percentage glazing from the earliest stages in the design process through to later stage detail design.
Image 1 below shows how the required standards can be set for conceptual models within FenestraPro for Revit, and shows where values that “non-compliant” with the selected standard are highlighted as red.
Image 2 below highlights where thermal performance values are not specified in the detailed model and provides a link to adjust the analytical properties for the element and displays where the thermal performance values are not compliant with the selected standard or code.
Images 2 and 3
How To Manage Natural Daylight Using FenestraPro
In accordance with Norway’s compliance regulations TEK17 section 13-7, daylight requirements can be fulfilled by ensuring that the average daylight factor in the room be at least 2.0%. FenestraPro provides daylight factor values in real time that enables compliance checking based on a 2% minimal design daylight factor. It considers the area of glazing, impact of shading devices, surrounding buildings and self-shading, and the glazing specification with appropriate Visible Light Transmittance (VLT).
Images 2 and 3 above shows how FenestraPro provides real time daylight factors for facades, separated into various surfaces, based on internal zoned spaces or rooms. Although the average daylight factor for the façade is 3.89%, the surfaces with minimal punched windows are below the required 2%, while the highly glazed areas at the curtain wall are in excess of 11.9% as these zones are almost 100% glazed. In this example, it is required to increase the amount of glazing to the 3 surfaces that are below the minimum requirement.
Considering Solar Heat Gain in FenestraPro
Within TEK17, consideration must be given to passive solar heat gain to reduce the heating and cooling loads which can account for over a quarter of the building’s energy use. FenestraPro for Revit provides a balanced understanding between thermal performance (heat loss), daylighting and heat gain. Image 4 below shows a highly glazed south facing façade that is overheating beyond the 25W/m2 recommendation. In this instance, a reduction of the amount of glazing in the curtain wall should be considered, perhaps with an increase in the amount of spandrel.
Alternatively, a change of glazing specification to a glass with a lower solar heat gain coefficient (SHGC) or the introduction of shading could also be considered to reduce the heat gain, but when introducing shading devices consideration should also be given to the impact of daylighting.
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