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Schmidt, Dietrich Dietrich; Jóhannesson, Gudni Gudni. Model for the Thermal Performance of a Double Air Gap Wall Construction. Nordic Journal Of Building Physics: Acta Physica Aedificiorum, v. 2, p. 1 -2, 2001.
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Número de Trabalhos: 4 (Nenhum com arquivo PDF disponível)
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Dados do autor na base InfoHab:
Número de Trabalhos: 3 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Abstract

New heating and cooling systems are necessary to meet increased requirements regarding thermal comfort and energy efficiency in buildings. Low temperature surface conditioning systems, with their potential to utilise the heat-transfer properties of entire wall, floor or ceiling surfaces, are an interesting solution to meet this challenge. The double-air-gap construction analysed in this article makes it possible to utilise heating sources at low temperatures to provide space heating or cooling. In order to investigate the function of this class of systems a special and efficient mathematical modeling method using matrix notation has been developed for the steady state solution. Case studies with a light exterior wall construction and one with a prototype wall-window-construction have been carried out. The results obtained show the way for the calculation and how to evaluate the air temperatures in the gaps. For the studied cases heat fluxes for the surfaces are calculated and discussed. On that basis design suggestions regarding the position of the gaps inside the construction are given. Furthermore parameter studies with a varying airflow and changing solar radiation are conducted. For most possible cases where the heat or cold demanded is produced in a conventional way the gaps should be placed close to the inside surface of the entire construction to minimize heat losses to the ambient environment. The effect of solar radiation heating the air inside the gaps is demonstrated in a case study. Further research steps introducing also the dynamic behaviour of the system are outlined.
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