The effectiveness of fiber-filled concrete : The application of an old technique to solve a modern problem
Keywords:Thermal Modelling, Fiber filled concrete, concrete, RC filter, Equivalent electrical circuit
Using an analogy between the conduction of electricity and the conduction of heat, a thermal problem has been recast in terms of an electrical circuit, facilitating the variation of physical properties. The electrical model provided an answer to the question of ‘what is the effect of different fiber additives on the conduction of heat in a typical concrete floor?’. The model used an amount of heat energy, representative of that collected during one day on a photovoltaic cell of area 1 m2 located at 45 degrees North and was applied to heating coils laid between the sub-floor and main floor. Quantitative results are presented for the case of a steel fiber (SF) additive compared to a glass fiber (GF) additive. The SF additive conducted the heat more efficiently than the GF additive but the delay in peak outputs was similar. The results are an essential first step in a cost benefit analysis.
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