Determination of Linear Thermal Transmittance for Corners with Acute Angle

2014 ◽  
Vol 1041 ◽  
pp. 113-116
Author(s):  
František Vlach
Keyword(s):  
Computational Methods ◽  
Energy Performance ◽  
Acute Angle ◽  
Engineering Practice ◽  
Thermal Transmittance ◽  
Energy Performance Of Buildings ◽  
Standard Problem ◽  
Thermal Bridges

This paper deals with the determination of linear thermal transmittance for buildings with acute angle shapes. Calculation of linear thermal transmittance is a standard problem in determining the influence of thermal bridges on the overall energy performance of buildings. Computational methods are known for ordinary rectangular buildings and the values of typical detail are listed in databases. Current architecture of designs buildings uses acute angle shapes quite frequently. It corresponds with new trends in architecture. In such cases the value of linear thermal transmittance is not accurate for using databases. This paper presents an analysis of the influence of the change of angle of the walls in corner to linear thermal transmittance. It provides information applicable for buildings assessment in engineering practice.

Determination of Linear Thermal Transmittance for Curved Detail

2014 ◽  
Vol 899 ◽  
pp. 112-115
Author(s):  
František Vlach ◽  
Petr Jelínek
Keyword(s):  
Energy Saving ◽  
Volume Ratio ◽  
Energy Performance ◽  
Engineering Practice ◽  
Standard Methods ◽  
Thermal Transmittance ◽  
Energy Performance Of Buildings ◽  
Standard Problem ◽  
Current Energy

This paper deals with the determination of linear thermal transmittance for buildings with rounded shapes. Calculation of linear thermal transmittance is a standard problem in determining the influence of thermal bridges on the overall energy performance of buildings. Computational methods are known for ordinary rectangular buildings. Current energy-saving architecture designs buildings with rounded organic shapes quite frequently. Not only it corresponds with new trends in architecture, but also serves to improve the area to volume ratio of buildings. In such cases the value of linear thermal transmittance calculated by standard methods isn't accurate enough. This paper presents an analysis of the influence of the curvature of the buildings surface to linear thermal transmittance. It provides information applicable for buildings assessment in engineering practice.

Research on Amending the Energy Efficiency Provisions in the Building

2014 ◽  
Vol 568-570 ◽  
pp. 1991-1994
Author(s):  
Hai Hong Cui
Keyword(s):  
Energy Performance ◽  
Hot Water ◽  
Building Regulations ◽  
Thermal Transmittance ◽  
Energy Performance Of Buildings ◽  
Air Tightness ◽  
Thermal Bridging ◽  
Technical Basis ◽  
Fuel Costs

The purpose of this paper is to identify the main requirements of the Building Regulations Part L1A for new dwellings. An explanation of the technical basis for energy rating is given including how they are calculated, how fuel costs are used, the role of the standard occupancy pattern, and an appreciation of the Building Research Establishment Domestic Energy Model (BREDEM). The aims and requirements of the European Directive on the Energy performance of Buildings and its implementation for new and existing domestic buildings is also considered. Design/methodology/approach – The requirements of Part L1A of the Building Regulations are developed. These relate to the thermal properties of the building fabric including insulation, thermal bridging, air tightness and glazing, the efficiency and responsiveness of heating and hot water systems, ventilation and lighting. The methodology for calculating thermal transmittance coefficients (U-values) is also demonstrated.

scholarly journals THE INFLUENCE OF LINEAR THERMAL TRANSMITTANCE OF THERMAL BRIDGES ON THE ENERGY PERFORMANCE CLASS OF BUILDINGS – SIMPLIFIED METHOD

2016 ◽  
Vol 1 (14) ◽  
Author(s):  
Danilo Vunjak ◽  
Arpad Čeh ◽  
Neđo Đurić ◽  
Golub Karaman ◽  
Ivan Hegediš
Keyword(s):  
Energy Consumption ◽  
Significant Influence ◽  
Energy Performance ◽  
Heat Losses ◽  
Thermal Transmittance ◽  
Simplified Method ◽  
Thermal Bridges

Thermal bridges have significant influence at calculation of the energy performance classes ofbuildings. This especially applies to countries where energy performance classes of buildings aredetermined based only on energy consumption for heating (such as Serbia, Bosnia and Hercegovina,Croatia...). Significant differences arise in determining the heat losses due to thermal bridges.Differences that can occur by using simplified methods depending on national recommendations ofdifferent countries are shown in this article.

New Calculation Method for Determination of the Influence of Thermal Bridges on a Building

2016 ◽  
Vol 820 ◽  
pp. 183-188
Author(s):  
Rastislav Menďan ◽  
Monika Pavčeková
Keyword(s):  
Calculation Method ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Thermal Transmittance ◽  
Exact Determination ◽  
Thermal Bridges ◽  
Building Practice

The contribution presents a new calculation method for more exact determination of increase of thermal transmittance due to thermal bridges ΔU. Since each building is three-dimensional, to get the objective and exact results, the calculation of heat losses of a building should be carried out using three-dimensional model. However, the 3D calculation is practically rather difficult and very hard realizable in building practice in Slovakia nowadays. It is much simpler to model and calculate a building as two-dimensional. The calculation method presented in this contribution is based on the modeling two-dimensional sections of the whole building taking into account the building as a whole.

scholarly journals Fast Modelling of nZEB Metrics of Office Buildings Built with Advanced Glass and BIPV Facade Structures

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3194 ◽  
Author(s):  
Suzana Domjan ◽  
Sašo Medved ◽  
Boštjan Černe ◽  
Ciril Arkar
Keyword(s):  
Energy Efficiency ◽  
Planning Process ◽  
Energy Performance ◽  
Linear Regression Models ◽  
Climate Conditions ◽  
Building Integrated Photovoltaics ◽  
Energy Performance Of Buildings ◽  
Modelling Techniques ◽  
Efficiency Indicators

The planning process of nearly Zero Energy Buildings (nZEB), as defined in Energy Performance of Buildings Directive (EPBD), requires that designers check their solutions at all stages of planning. In the initial design phase, methods and tools for which only basic design knowledge of the modelling of energy efficiency indicators is required are often sufficient. With the introduction of fast modelling techniques, designers’ work can be simplified. A method and software for the fast modelling of nZEB energy efficiency indicators of buildings constructed with advanced multi-layer glass and building integrated photovoltaics facade (BIPV) structures are presented. The computer tool for fast modelling combines (i) upgraded national certificated software for energy performance of buildings (EPB) evaluation, which is used for performing auto-repeating numerical calculations based on the design of experiments (DOE) and (ii) software for the determination of multiple linear regression models and the presentation of results. The case studies made for different buildings and climate conditions show the variety of options offered by the developed fast modelling approach. It can be seen that buildings with a large proportion of advanced glassed facade and even all-glass buildings can fulfil nZEB requirements via the on-site production of electricity with BIPV facade structures.

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