One-dimensional solutions to Fourier's equation and measures of heat transmission through walls: The role of wall decay times

Urbikain, M. Karmele; Davies, M.G.

doi:10.1016/j.buildenv.2007.07.001

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…The pulse itself is built up of harmonic components by routine Fourier analysis.) The present article together with further development of the approach demonstrated in [7] provides a basis to find transfer coefficients that is simpler both conceptually and computationally than more standard procedures.…”

Section: Discussionmentioning

confidence: 97%

“…A companion paper [7] has shown how the / values themselves can be found for a simple wall. (It consists in finding the response of a wall to a triangular unit pulse of temperature with a 2-h base.…”

Section: Discussionmentioning

confidence: 97%

“…A logical approach is first to find the response factors / corresponding to q i : T o (and q o : T o , and q i : T i , though the first is not usually needed). (Decay times are not in fact needed to find response factors [7].) The d coefficients are then used to find the transfer coefficients themselves.…”

Section: Discussionmentioning

confidence: 99%

“…It has generally been believed that their evaluation required knowledge of the series of wall thermal decay times, (denoted by z j ). This is not so: it has recently been demonstrated [7] that the response factors can be found independently of decay times. (Indeed z j values can in principle be found from the response factors.)…”

Section: Introductionmentioning

confidence: 94%

See 3 more Smart Citations

Determination of wall decay times by use of a polynomial equation

Urbikain

Davies

2010

International Journal of Heat and Mass Transfer

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

See 2 more Smart Citations

Determination of wall decay times by use of a polynomial equation

Urbikain

Davies

2010

International Journal of Heat and Mass Transfer

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“…Hay diferentes formas de estimar este tiempo que incluye el empleo de series de Fourier, funciones de autocorrelación, transformadas, etc. (17) . En la sección V se emplea un método de cálculo similar al reportado por Davis (18) , aunque no recurriendo a datos horarios sino a la totalidad de datos reunidos en 60 días para disminuir el error cometido en las mediciones y, consistentemente, el de los coeficientes resultantes.…”

Section: Modelado Analíticounclassified

Characterization of the thermal behaviour of a prototype building in Tandil (Buenos Aires)

Vásquez

Marino

Thomas

2015

AnAFA

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La elección de la ubicación y orientación de una construcción y las decisiones tomadas en las etapas de su diseño tienen un importante efecto sobre el consumo energético necesario para su funcionamiento. Este es particularmente el caso para prever el óptimo aprovechamiento de la ventilación natural en el que las decisiones tempranas determinan el potencial para el uso renovable pasivo de la energía, lo cual se traduce en los menores costos energéticos y en la disminución de la contaminación del aire interior. El cuidadoso control sobre el aprovechamiento solar también puede reducir significativamente los costos derivados del uso de equipos de refrigeración o calefacción. Con el objeto de optimizar la construcción de edificaciones con mínimo consumo energetico, se evalúa el comportamiento térmico durante el verano de una construcción representativa de los estándares edilicios de la ciudad de Tandil. Se presenta el análisis de las mediciones continuas y sistemáticas realizadas con sensores de temperatura y humedad en puntos específicos del interior, y de los parámetros meteorológicos externos, asociando la información mediante un modelo analítico que da cuenta de la conductividad, la radiación y la convección debida al viento. El objetivo es hallar los parámetros térmicos globales del edificio, y con ellos el flujo de calor a través de la envolvente, resolviendo el "problema inverso". Los resultados son cotejados con los obtenidos resolviendo el "problema directo" estándar. Palabras clave: evaluación térmica, modelo analítico, transferencia de calor, condiciones reales de uso. The choice of the location and orientation of a construction and the decisions made during the early stages of the design affect significantly the energy consumption necessary for its functioning. Particularly, this is the case in which the optimal use of natural ventilation is convenient to reduce energy costs and pollution of the air indoors. Careful control of the solar resource can also considerably diminish the costs derived from the use of air conditioners. The thermal behaviour of a building that is representative of the constructive procedure in Tandil city is evaluated during the summer with the purpose of optimizing future constructions that minimize the energy comsuption. The analysis of continuous and systematic temperature and humidity measurements performed with sensors in specific points inside the building and the external meteorological parameters is presented. The information collected is integrated by means of an analytical model that considers the contributions of the conductivity, radiation and convection caused by the wind. The goal is to estimate the typical thermal parameters of the building and, with them, the heat flux across the envelope, solving the "inverse problem". The results are compared with those obtained solving the standard "direct problem".

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A frequency domain estimation of wall conduction transfer function coefficients

Urbikain

Davies

2012

Energy and Buildings

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One-dimensional solutions to Fourier's equation and measures of heat transmission through walls: The role of wall decay times

Cited by 9 publications

References 13 publications

Determination of wall decay times by use of a polynomial equation

Determination of wall decay times by use of a polynomial equation

Characterization of the thermal behaviour of a prototype building in Tandil (Buenos Aires)

A frequency domain estimation of wall conduction transfer function coefficients

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