Cost Optimal and Nearly Zero-Energy Buildings (nZEB): by Jarek Kurnitski (auth.), Jarek Kurnitski (eds.)

By Jarek Kurnitski (auth.), Jarek Kurnitski (eds.)

Cost optimum and approximately 0 power functionality degrees are ideas initiated via the ecu Union’s (EU) strength functionality of constructions Directive which was once recast in 2010. those can be significant drivers within the building region within the following couple of years, simply because all new structures within the european from 2021 onwards are anticipated to be approximately 0 power structures (nZEB).

This ebook introduces the technical definitions, procedure limitations, power calculation technique and enter info had to set fundamental power established minimum/cost optimum and nZEB requisites in nationwide strength frames. labored examples are supplied to demonstrate the calculation of brought, exported and first power, and renewable strength contribution. 5 case stories of excessive functionality nZEB workplace structures throughout Europe are suggested to teach replacement technical options and to attract a few normal layout principles in line with accomplished nZEB constructions. particular positive aspects of the nZEB layout procedure, in particular within the early levels, and architectural competitions are incorporated. those describe vital layout concerns within the scoping and conceptual layout section, permitting layout streams to be managed in order that designated ambitions will be met.

This e-book is meant for readers who must be conscious of or are operating with the strength functionality of constructions – for choice makers in private and non-private sectors, architects, engineers, building consumers, experts, contractors, brands and students.

The editor of this publication, Professor Jarek Kurnitski has made significant contributions to the coaching of the ecu REHVA nZEB technical definition and has constructed strength calculation frames for present Estonian and Finnish strength functionality laws. he's the chief of nZEB study at Tallinn collage of expertise in Estonia and Aalto college in Finland, and he has over three hundred publications.

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Extra info for Cost Optimal and Nearly Zero-Energy Buildings (nZEB): Definitions, Calculation Principles and Case Studies

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Nearly Zero-Energy Building’s (nZEB) Definitions and Assessment Boundaries 23 In addition to the calculation of the RER relative to all energy use in the building (Eq. 7), the calculation of RER is also possible in relation to specific service as heating or cooling or domestic hot water, etc. depending on national specification. 3 Calculation Examples The following calculation examples, developed by REHVA [7], will explain the calculation logic of energy flows and different system boundaries in order to be able to calculate the primary energy indicator and renewable energy contribution.

The specific heat loss coefficient includes transmission and infiltration losses through the building envelope and is calculated per heated net floor area: P P P Ui Á Ai þ Wj Á lj þ vp Á np þ qa Á ca Á V_ i H ¼ ð1Þ Afloor Afloor where: H Afloor Ui Ai Wi li vp np qa ca V_ i Heat loss coefficient, W/K; Heated net floor area, m2; Thermal transmittance of envelope part i, W/(m2 K); Area of envelope part i, m2; Thermal conductance of linear thermal bridge i, W/(mK); Length of linear thermal bridge i, m; Thermal conductance of point thermal bridge p, W/K; Number of point thermal bridge p, -; Density of air, kg/m3; Specific heat capacity of air, J/(kg K); Infiltration rate, m3/s: Infiltration rate can be calculated with national regulation, here the Estonian equation [4] was used: q50 Á Aenv V_ i ¼ 3;600 Á x where: q50 Air leakage rate of building envelope, m3/(h m2); Aenv Area of building envelope (including the bottom floor), m2; ð2Þ Space heating Supply air heating in AHU Domestic hot water Cooling Fans and pumps Lighting Appliances Total energy need Energy need kWh/(m2 a) g-value Ext.

4 Germany The current requirements (EnEV2009) for new buildings are calculated in relation to a so-called ‘‘reference building’’ with the identical geometry. For the reference building, standard envelope properties, such as U-values and standard installation engineering given in the EnEV, are applied within the calculation. The primary energy use of the planned building must be below or equal to the energy use of the reference building. Also, a limit value for the specific transmission heat loss is applied, and a minimum amount of heat from renewable sources should be reached (EEWärmeG).

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