Quantification of heat losses through building envelope thermal bridges influenced by wind velocity using the outdoor infrared thermography technique

2017 ◽  
Vol 208 ◽  
pp. 1038-1052 ◽  
Author(s):  
Małgorzata O'Grady ◽  
Agnieszka A. Lechowska ◽  
Annette M. Harte
Keyword(s):  
Infrared Thermography ◽  
Wind Velocity ◽  
Building Envelope ◽  
Heat Losses ◽  
Thermal Bridges

scholarly journals Infrared Thermography Assessment of Thermal Bridges in Building Envelope: Experimental Validation in a Test Room Setup

2014 ◽  
Vol 6 (10) ◽  
pp. 7107-7120 ◽  
Author(s):  
Francesco Bianchi ◽  
Anna Pisello ◽  
Giorgio Baldinelli ◽  
Francesco Asdrubali
Keyword(s):  
Infrared Thermography ◽  
Experimental Validation ◽  
Building Envelope ◽  
Test Room ◽  
Thermal Bridges

scholarly journals Experimental investigation of thermal bridges in building at real conditions

2018 ◽  
Vol 70 ◽  
pp. 03013
Author(s):  
Robert Smusz ◽  
Michał Korzeniowski
Keyword(s):  
Building Materials ◽  
Thermal State ◽  
Building Envelope ◽  
Heat Losses ◽  
Additional Heat ◽  
In Situ Ir ◽  
Thermal Bridges ◽  
Modern Technologies

In recent time the energy consumption of buildings may be reduced by the application of modern technologies in the construction industry. Modern building materials ensure a reduction of heat losses. However, studies show that thermal bridges may cause up to 30% of the additional heat losses through the building envelope. Therefore, a one key aspect in assessing the real thermal state of buildings is the identification of the heat losses through thermal bridges. The analytical, experimental and numerical methods are used for the assessment of thermal transmittance value of building. In the paper the authors present the experimental research on heat losses through the building under real winter conditions. Infrared thermovision technique has been used to the thermal bridges assessment in situ. IR thermography technique allowed the determination of the influence of thermal bridges on the additional heat losses. For the obtaining the surface emissivity the measurements have been also performed with the use of thermocouples system. Numerical validation of the experimental results has been performed.

scholarly journals Evaluation of Thermal Bridges Using Online Simulation Software

2020 ◽  
Vol 172 ◽  
pp. 08010
Author(s):  
Ligia Moga ◽  
Ioan Moga
Keyword(s):  
Finite Difference Methods ◽  
Building Envelope ◽  
Simulation Software ◽  
Heat Losses ◽  
Modelling And Simulation ◽  
Zero Energy ◽  
Online Simulation ◽  
Thermal Bridge ◽  
Thermal Bridges ◽  
The Impact

In order to reach nearly Zero Energy Buildings, a thorough design must be given in designing proper junctions, which will overall reduce the impact of the thermal bridges on the thermal performance of the building envelope. It is well-known that a thermal bridge is a weak thermal area of the building envelope through which increased heat losses occur. For the thermal bridges' evaluation, several numerical simulation software exist on the market, but their usage implies knowledge regarding the numerical modelling and simulation using various numerical methods (i.e. finite element method, finite difference methods, and others). Due to time constraint, designers use thermal bridges atlases that provide values for the linear heat transfer coefficient for several types of thermal bridges. Nevertheless, the multitude of existing thermal bridges requires more and more atlases which are not feasible in elaborating, due to time constraints. In order to respond to this demand, the authors developed a software for the modelling and simulation of thermal bridges that can be easily accessed by practitioners. The paper presents the software its components and the way that the user can interact with it.

scholarly journals Use of infrared thermography for the evaluation of heat losses during coal storage

1999 ◽  
Vol 60 (3) ◽  
pp. 213-229 ◽  
Author(s):  
V Fierro ◽  
J.L Miranda ◽  
C Romero ◽  
J.M Andrés ◽  
A Pierrot ◽  
...  
Keyword(s):  
Infrared Thermography ◽  
Heat Losses

scholarly journals COMPARISON OF THREE CALCULATION METHODS OF ENERGY PERFORMANCE CERTIFICATES IN SLOVENIA

2018 ◽  
Vol 13 (1) ◽  
Author(s):  
Wadie Kidess
Keyword(s):  
Numerical Calculation ◽  
Energy Performance ◽  
Heat Losses ◽  
Calculation Methods ◽  
The Third ◽  
Simplified Method ◽  
Calculation Results ◽  
Thermal Bridges ◽  
Simplified Calculation ◽  
Family House

In order to get the authorization for issuing energy performance certificates in Slovenia, the expert candidate has to attend the prescribed course and pass the exam. The simplified method for heat losses calculation that is taught at this course neglects the thermal bridges, raising concerns whether the calculation results are reliable. In this paper we have compared three methods for calculation of thermal losses for a “typical” family house. The first is the above mentioned simplified calculation using a correctional factor; the second takes into account the thermal bridges, using linear thermal transmittances obtained by numerical calculation, and the third takes into account the thermal bridges, using default values for linear thermal transmittances. Noting that the second method returns the most exact values, we have found that the first method results are too large, yet still smaller than the third method results.

scholarly journals Comparative analysis of selected glass systems by dynamic simulation using measured real environmental conditions

2020 ◽  
Vol 172 ◽  
pp. 19009
Author(s):  
Silvia Bizoňová ◽  
Dušan Katunský ◽  
Miloslav Bagoňa
Keyword(s):  
Dynamic Simulation ◽  
Energy Savings ◽  
Building Envelope ◽  
Heat Losses ◽  
Experimental Glass ◽  
Existing Structures ◽  
Spectrally Selective ◽  
The Subject ◽  
Simulation Results ◽  
Made In

The subject of the study presents the measurement of temperatures on surfaces of glass systems of existing structures and the surfaces of experimental glass systems obtained by dynamic simulation. Measurements were made in the test cells of the Faculty of Civil Engineering of the Technical University of Košice. The partial results of which are the basis for the comparison of the currently installed and experimentally designed glass systems using spectrally selective films. The proposed mathematical-physical model was simplified by replacing the sash, frame and its components with a homogenous element with minimal shape modifications, while this does not have a significant effect on the simulation results. The choice of the proposed glass system respects the need for reduction of solar gains in summer and heat losses in buildings in winter through the weakest part of the building envelope and indicates future energy savings in relation to cooling and heating costs with a view to optimizing light and thermal comfort.

scholarly journals CASE-STUDY ANALYSIS OF CONCRETE LARGE-PANEL APARTMENT BUILDING AT PRE- AND POST LOW-BUDGET ENERGY-RENOVATION

2016 ◽  
Vol 23 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Kalle KUUSK ◽  
Targo KALAMEES ◽  
Siim LINK ◽  
Simo ILOMETS ◽  
Alo MIKOLA
Keyword(s):  
Co2 Concentration ◽  
Building Envelope ◽  
Study Analysis ◽  
Indoor Climate ◽  
Apartment Building ◽  
Case Study Analysis ◽  
Thermal Transmittance ◽  
Large Panel ◽  
Thermal Bridges

The paper presents a case study analysis of low-budget renovation of a typical concrete large-panel apartment building. Focus is on the measurements and analyses of energy consumption, indoor climate, CO2 concentration, air leakage rate, thermal transmittance of thermal bridges, and thermal transmittance of the building envelope before and after the renovation. Results indicate that the renovation project was generally successful, with delivered energy need de­creasing by 40% and heating energy need decreasing by 50%. However, some key problems need to be solved to achieve full energy efficiency potential of the renovation works. Those critical problems are the performance (thermal comfort, heat recovery) of ventilation systems, thermal bridges of external wall/window jamb and economic viability. Currently, a major renovation is not economically viable, therefore financial assistance to the apartment owners’ associations is required to encourage them to undertake major renovations.

scholarly journals Locating Hidden Elements in Walls of Cultural Heritage Buildings by Using Infrared Thermography

Buildings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 32 ◽  
Author(s):  
Hrvoje Glavaš ◽  
Marijana Hadzima-Nyarko ◽  
Ivana Haničar Buljan ◽  
Tomislav Barić
Keyword(s):  
Infrared Thermography ◽  
19Th Century ◽  
Middle Ages ◽  
18Th Century ◽  
Building Envelope ◽  
Step Heating ◽  
Heritage Buildings ◽  
Nondestructive Testing Method ◽  
Paint Removal ◽  
The 19Th Century

The structure of Tvrđa and its buildings date back to the Middle Ages. Tvrđa represents the Old Town of the city of Osijek and the best-preserved and largest ensemble of Baroque buildings in Croatia. After the withdrawal of the Ottomans in 1687, during the 18th century, the Austro-Hungarian administration systematically formed a new fortification system, regulated streets and squares and built a large number of military objects. Tvrđa took its present form in the 19th century and has kept it since then. Investigating the historical development of individual buildings, in addition to archival sources and existing architectural documentation, the obvious source of information are the buildings themselves. The aim of this paper is to explore the possibilities of using infrared thermography to find structural elements and hidden openings in historic buildings in Osijek’s Tvrđa. This paper describes the exploration of the 18th century openings on the facades of the former Kostić houses. The facades were bricked into the walls in the 19th century because houses were reused and their purposes changed from commercial to residential. Infrared thermography is often a starting, nondestructive testing method (NDT) for building analyses. This paper presents thermographic analyses of two buildings. The analyses were carried out in December 2017 and January 2018. Using a steady-state thermographic analysis of a building envelope as the first step, the audit was continued with step heating (SH) of an interest point where changes in a thermal pattern were expected due to additional bricking. Heat flux was generated by the usage of a heat gun for paint removal.

scholarly journals Analysis of the temperature distribution in the place of fixing the ventilated facade

2019 ◽  
Vol 97 ◽  
pp. 01041
Author(s):  
Adam Ujma ◽  
Marta Pomada
Keyword(s):  
Heat Transfer ◽  
Thermal Conditions ◽  
Building Envelope ◽  
Heat Demand ◽  
Thermal Bridges ◽  
Ventilated Facade ◽  
The Impact ◽  
New Buildings ◽  
The Heat Balance ◽  
Very High

Designers more and more often choose facade systems with ventilated layers for external walls, especially in the case of new buildings. They are also used to modernize existing buildings. Mechanical connectors are a characteristic element of these constructions. Often, they are ignored in calculating the heat balance of rooms and the entire building. Because they pierce the thermal insulation layer they cause point thermal bridges. The influence of thermal point bridges, usually made of aluminum, i.e. a material with very high thermal conductivity, for heat transfer turns out to be significant. Such thermal bridges significantly increase heat losses through building partitions. This situation increases the heat demand in the rooms to compensate for the heat loss. The article presents the results of the analysis of the impact of mechanical fasteners in ventilated facade systems on heat transfer in the building envelope. The influence of various materials and constructional solutions on the thermal conditions in these walls was investigated.

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