Journal of the Nigerian Association of Mathematical Physics

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On temperature control of buildings by adobe wall design: Duffin and Knowles' exponential transmission line model revisited

EE Iheonu


Duffin and Knowles (Solar Energy, Vol. 27(3), 1981) developed an equation for attenuation factor of an Adobe wall modelled as 4-terminal electrical transmission line network. The modelled electrical system and the derived formula for the real attenuation factor of the wall have been critically examined and then modified by taking into cognisance the true conceptualisation of a physical filter network as analogue of the thermal wall. By comparing results from the two versions of the exponential transmission line network models, it is shown that the effect of the correction on the attenuation factor is significant.

Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 35-40
AJOL African Journals Online