The Influence of Openings on Energy Demand of Buildings: Analysis of their characteristic parameters using LIDER software (Spain)

By Izaskun Gallo Ormazábal, Justo Garcia-Navarro and Trinidad Fernández Pérez.

Published by The International Journal of the Constructed Environment

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Article: Print $US10.00
Article: Electronic $US5.00

Openings on buildings façades perform several functions, namely, illumination, ventilation, vision, and communication with outside conditions. Furthermore, when energy efficiency is to be considered, the opening plays a major part in the energetic balance of a building.
This article studies the opening as a specialized low technology system which regulates the external climatic conditions having an impact on the building energy demand. First, it was analysed the main parameters that characterize the opening as an element of solar reception in order to indentify the influence of each of them with regard to energy demand. By means of LIDER software calculation method the opening is studied as a solar gain element. LIDER is a recognized free computer programme of Spanish Building Regulation (Código Técnico de la Edificación, CTE). The contribution of 14 specific parameters of the opening to energy demand is evaluated, specifically, orientation, window-to-wall ratio, frame percentage, degree of absorption, glazing g-value, frame U-value, glazing U-value, overhangs, returns, louver blinds, awnings, air permeability, infiltration and air change rate,.
With this approach, it was obtained the relative relevance of the 14 parameters under study with regards to energy performance of a simulated space considering the conditions set in the analysis. The alteration in those parameters allows for variations in energy demand estimated at the range 10-60% in heating, and between 2-150% in cooling. The outcomes are more important in qualitative than in quantitative terms due to the limitations of the method and to the working hypotheses of the onset conditions.

Keywords: Theme: Environmental Impacts, Openings Design, Energy Efficiency, Energy Performance of Windows

The International Journal of the Constructed Environment, Volume 4, Issue 1, pp.41-57. Article: Print (Spiral Bound). Article: Electronic (PDF File; 631.356KB).

Arch. Izaskun Gallo Ormazábal

Research Assistant, Department of Construction and Rural Roads, ETSIA (Universidad Politécnica Madrid), Madrid, Madrid, Spain

Architect by the School of Architecture of Valladolid University (2002) and Master degree in “Innovation in Building Technology” (2012) at Technical University of Madrid. Nowadays she is a PhD student in “Innovation in Building Technology” and she works as Research Assistant in “Sustainable Refurbishment” research project at Technical University of Madrid. She is member of “Sustainability in Construction and Industry” UPM Research Group.

Dr. Justo Garcia-Navarro

Professor, Department of Construction and Rural Roads, Technical University of Madrid, Madrid, Madrid, Spain

PhD in Architecture at Technical University of Madrid (UPM) (1988) and Architect by School of Architecture, UPM (1983). He is Professor on Sustainability in Construction and Agricultural Buildings at the Department of Construction and Rural Roads (UPM) and Director of the UPM Research Group “Sustainability in Construction and Industry”. He is member of Spanish Habitat Committee and Good Practices WG and member of the Expert Commission for the assessment of non-traditional materials, constructive procedures and systems (National Technical Approval, DIT), Eduardo Torroja Institute, Spanish Research Council, CSIC.

Trinidad Fernández Pérez

Lecturer, Polytechnic University of Madrid, Madrid, Madrid, Spain

PhD in Linguistics from the Universidad Nacional de Educación a Distancia (UNED) and a degree in English Philology. She is an Assistant Professor of English for Specific Purposes at the Technical University of Madrid (UPM) Escuela Técnica Superior de Edificación, and convenes a postgraduate course in English Terminology in the field of architecture and construction. Her research interests are in architectural terminology, dictionaries, online specialized lexicography and second language learning. She is a member of “Sustainability in Construction and Industry” UPM Research Group.