Thermal behavior of building walls in summer: Comparison of available analytical methods and experimental results for a case study

There is a wide variety of thermal analyses that can be used to characterize the thermal behavior of a wall under certain outdoor conditions. The selection of a particular wall configuration for a building project involves not only the outdoor climate, but also the whole building characteristics, orientation, percentage of glazed areas, occupation periods, lifestyles, etc. In this paper we apply common available methods for wall thermal analysis to two particular wall types, a massive brick wall and an insulated brick wall, in order to compare the information given by each method and to evaluate how these methods can help in the selection of a certain type of wall. The studied methods include the estimation of the wall time lag and decrement factor, the harmonically heated slab model, the Athanassouli’s method, and numerical simulations. The study was performed for the walls of a residence for university students and it was built in La Pampa (Argentina). Once the building was finished, the transient thermal behavior of two walls was monitored during one summer week. The experimental results are presented and the fitting with the thermal behavior predicted by each method is discussed. The thermal comfort indicators PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied) were calculated for two flats, at ground floor and first floor respectively.

[1]  Andre Omer Desjarlais,et al.  Influence of Architectural Details on the Overall Thermal Performance of Residential Wall Systems , 1994 .

[2]  J. C. Jaeger,et al.  Conduction of Heat in Solids , 1952 .

[3]  P. Fanger.  Moderate Thermal Environments Determination of the PMV and PPD Indices and Specification of the Conditions for Thermal Comfort , 1984 .

[4]  S. Flores Larsen,et al.  Response of conventional and energy-saving buildings to design and human dependent factors , 2005 .

[5]  J. Douglas Balcomb,et al.  Passive solar buildings , 1992 .

[6]  Baruch Givoni,et al.  Man climate and architecture , 1969 .

[7]  Karolos-Nikolaos Kontoleon,et al.  The influence of wall orientation and exterior surface solar absorptivity on time lag and decrement factor in the Greek region , 2008 .

[8]  Alejandro Luis Hernández,et al.  Simulación mediante SIMEDIF del comportamiento térmico de un prototipo de vivienda liviana construido en la Universidad Nacional de Salta , 2000 .

[9]  H. Asan,et al.  Investigation of wall's optimum insulation position from maximum time lag and minimum decrement factor point of view , 2000 .

[10]  Elizabeth Kossecka,et al.  Multi-dimensional heat transfer through complex building envelope assemblies in hourly energy simulation programs , 2002 .

[11]  Y. Çengel.  Heat Transfer: A Practical Approach , 1997 .

[12]  Recep Yumrutaş,et al.  Estimation of total equivalent temperature difference values for multilayer walls and flat roofs by using periodic solution , 2007 .

[14]  A model of the thermal restoration transient state of an opaque wall after the interruption of solar radiation , 1999 .

[15]  H. Asan.  Numerical computation of time lags and decrement factors for different building materials , 2006 .

[16]  S. Flores Larsen,et al.  An experience on integrating monitoring and simulation tools in the design of energy-saving buildings , 2008 .

[17]  Haji Hassan Masjuki,et al.  CORRELATION BETWEEN THERMAL CONDUCTIVITY AND THE THICKNESS OF SELECTED INSULATION MATERIALS FOR BUILDING WALL , 2007 .

[18]  W. C. Brown,et al.  Monitoring of the building envelope of a heritage house: a case study , 1999 .

[19]  S. Flores Larsen,et al.  Energy improvement of a conventional dwelling in Argentina through thermal simulation , 2008 .

[20]  Ulrich Renz,et al.  Calculating transient wall heat flux from measurements of surface temperature , 2002 .

[21]  Mehmet Kanoglu,et al.  Periodic solution of transient heat flow through multilayer walls and flat roofs by complex finite Fourier transform technique , 2005 .

[22]  H. Asan,et al.  Effects of Wall's thermophysical properties on time lag and decrement factor , 1998 .