Simulation of the Thermal Behaviour of Buildings Equipped with Low-Emissivity Glazed Components: A performance analysis

Simulation of the Thermal Behaviour of Buildings Equipped with Low-Emissivity Glazed Components: A performance analysis

Mario Cucumo Vittorio Ferraro Dimitrios Kaliakatsos Valerio Marinelli 

Department of Mechanical, Energetics and Management Engineering, University of Calabria, Via P. Bucci, Cube 44/C

Corresponding Author Email: 
dimitri@unical.it
Page: 
111-118
|
DOI: 
https://doi.org/10.18280/ijht.310215
Received: 
N/A
| |
Accepted: 
N/A
| | Citation

OPEN ACCESS

Abstract: 

In this paper, the authors want to highlight the different kinds of thermal behavior under dynamic conditions of buildings based on the use of two different types of glass for the windowed components: in the first type under consideration a doublestandard 4-12-4 glass is adopted, while in the second a low emissivity glass of equal thickness is used with the presence of a coating on the inner face of the window.

The analysis focuses on the determination of the indices of thermal comfort in the environment, both in free and in forced evolution, and consumptions of the HVAC plant when the system is functioning. For the evaluation of the above parameters, the analysis is initiated by determining the time profile of the internal temperature, of the internal surface temperature of the window and the time profile of the mean radiant temperature after properly defining the computational grid for the software. The simulations to evaluate the energetic advantage of the types of windows analysed, were carried out for two different case studies and in three different climatic zones through the use of Ecotect software.

After determining the temperature profiles mentioned above and calculating the indices for the thermal comfort PMV (Predicted Mean Vote) and PPD (Predicted Percentage of Dissatisfied) in accordance with the UNI EN ISO 7730:2006, the annual energy required for the air conditioning system and for the maintenance of the temperature set point within the environment were evaluated.

Subsequently, the energy certification for the second case study was performed on the basis of the indications of the technical specifications UNI TS 11300-1:2008 and 11300-2:2008, with the objective of determining what benefits are obtained from the point of view of the energy class, simply by changing the properties of the windows.

1. Introduction
2. Construction Of Climate Data
3. Analysis of the First Case Study
4. Evaluation of Thermal Comfort and Consumption Trends in Forced Evolution
5. Analysis of the Second Case Study
6. Energy Certification
7. Conclusions
  References

[1] Autodesk Ecotect Analysis, Sustainable Building Design Software, http://usa.autodesk.com/ecotect-analysis/

[2] Decreto Legislativo 19 agosto 2005, n. 192, Attuazione della direttiva 2002/91/CE relativa al rendimento energetico nell’edilizia, pubblicato nella Gazzetta Ufficiale n. 222 del 23 settembre 2005 - Supplemento Ordinario n. 158.

[3] Decreto Legislativo 29 dicembre 2006, n.311, Disposizioni correttive ed integrative al decreto legislativo 19 agosto 2005, n. 192, recante attuazione della direttiva 2002/91/CE, relativa al rendimento energetico nell'edilizia, pubblicato nella Gazzetta Ufficiale 26 del 1-2-2007- Supplemento Ordinario n. 26, testo in vigore dal: 2-2-2007.

[4] EN ISO 7730:2005, Ergonomics of the thermal environment - Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria.

[5] UNI TS 11300-1:2008, Energy performance of buildings Part 1: Determination of the thermal energy demand of the building for air conditioning in summer and winter.

[6] UNI TS 11300-2:2008; Energy performance of buildings - Part 2: Determination of the primary energy demand and of the efficiencies for winter heating and for the production of domestic hot water.

[7] Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the Energy Performance of Buildings, Official Journal of the European Communities, 4 January 2003.

[8] EN ISO 13790:2008, Energy performance of buildings -Calculation of energy use for space heating and cooling.

[9] EN 15316-1:2007, Heating Systems in Buildings -Method for calculation of system energy requirements and system efficiencies - Part 1: General.

[10] EN ISO 13786:2008, Thermal performance of building components - Dynamic thermal characteristics -Calculation methods.