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Schmidt, Dietrich Dietrich; Jóhannesson, Gudni Gudni. Approach for Modelling of Hybrid Heating and Cooling Components with Optimised RC Networks. Nordic Journal Of Building Physics: Acta Physica Aedificiorum, p. 1 -3, 2002.
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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

In the last decades considerable efforts have been made to reduce energy consumption in buildings; for example, by constructing super-insulated envelopes and more efficient installations. To make the energy use in buildings more efficient, new low temperature heating and cooling systems are required. A promising solution to improve the energy utilisation in buildings is the development of hybrid systems. Hybrid systems are building components or a combination of different building components that utilise the heat transfer and heat capacity properties of the whole construction to achieve room conditioning. Special advantages of these systems are the use of the heat storage properties or the construction together with a combined mass and heat transfer at low temperature differences between the room and the heating or cooling medium. The dynamic simulation of such a system is complicated because several heat transfer mechanisms act together and existing models describing hybrid systems are not satisfactory for design purposes. A method for mathematical modelling, for analysis of the thermal conditions of a building, and for description of multi-dimensional heat conduction has been developed (Jóhannesson 1981, Akander 1995, Mao 1997, Akander 2000). The core of this method is a transformation of the building construction’s properties into a network of discrete resistances and capacities. On the basis of an analysis of the dynamic properties of an entire construction, the behaviour of this construction in frequency domain can be calculated and the parameters of the components of a RC network can be estimated. Calculations of time dependent processes, like switching the mass flow on or off, are possible with these discrete networks. The resulting simplified model can be described in the Neutral Model Format (NMF), allowing it to be implemented in dynamic simulation programs, such as TRNSYS or IDA (Sahlin 1996). This method of transformation has been expanded upon this project extended to provide a method for examining hybrid systems and their interactions with other building components. A case study for a combined mass and heat transfer problem is given. The chosen example is heat storage in a borehole equipped with a co-axial piping. It is not a typical example of a building construction, but the problem in analysis and transformation is similar to other hybrid constructions, as for example a double air gap wall construction. The analysis for borehole is described in detail; the remaining steps in the modelling, the transformation, error estimation and the implementation will be the subjects of a following paper. The present paper is the first one in a series of articles, describing the modelling method in detail and with case studies.
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