This paper presents a research activity of Industrial Engineering Department of Perugia University (Italy) aimed at developing a technique to evaluate the thermal transient behavior of buildings combining thermographic measurements and computer simulation using the software tool TRNSYS 16. Infrared thermography was used to study heat transfer though the walls of an air conditioned building (heated and cooled zones) and characterize thermal anomalies due to the presence of parts of the building envelope where uniform thermal resistance are significantly changed, resulting in a multidimensional heat flow. This anomalies are called "thermal bridges". Obtained infrared picture were analyzed to describe the actual thermal behavior of the structure and implement a numerical model using TRNSYS 16 to extend the study to different weather situations and to define corrections to bring to the old structure, eliminating thermal bridges. TRNSYS runs through hourly values of various parameters included in a typical meteorogical year file: TMY2 .For this specific case of study the weather data was generated with Meteonorm, to make it possible to use TRNSYS in a building of the Faculty of Engineering of Perugia University. This study shows the importance of the combined use of infrared thermography and TRNSYS 16, to characterize the actual thermal behavior of building envelope, design and correct the building's components to improve its thermal performance, significantly lowering winter heat loss and summer heat gain.
Comparative Analysis of Thermal Behaviour of a Building by Infrared Thermography and TRNSYS Simulations
DESIDERI, UMBERTO;
2008-01-01
Abstract
This paper presents a research activity of Industrial Engineering Department of Perugia University (Italy) aimed at developing a technique to evaluate the thermal transient behavior of buildings combining thermographic measurements and computer simulation using the software tool TRNSYS 16. Infrared thermography was used to study heat transfer though the walls of an air conditioned building (heated and cooled zones) and characterize thermal anomalies due to the presence of parts of the building envelope where uniform thermal resistance are significantly changed, resulting in a multidimensional heat flow. This anomalies are called "thermal bridges". Obtained infrared picture were analyzed to describe the actual thermal behavior of the structure and implement a numerical model using TRNSYS 16 to extend the study to different weather situations and to define corrections to bring to the old structure, eliminating thermal bridges. TRNSYS runs through hourly values of various parameters included in a typical meteorogical year file: TMY2 .For this specific case of study the weather data was generated with Meteonorm, to make it possible to use TRNSYS in a building of the Faculty of Engineering of Perugia University. This study shows the importance of the combined use of infrared thermography and TRNSYS 16, to characterize the actual thermal behavior of building envelope, design and correct the building's components to improve its thermal performance, significantly lowering winter heat loss and summer heat gain.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
