Hygrothermic Performance Of The
Exterior And Interior Surfaces Of Buildings
Author(s)
H. Stopp & P. Strangfeld
Abstract
One of the current tasks of building physics is to find solutions in sense of the
sustainability. That means we must save heating energy and raw materials.
Therefore we have to develop building envelope parts with innovative
characteristics. This paper shows the coupled heat and moisture transfer at
adjacent areas of surfaces of the envelope parts of buildings. In this context the
interaction of the external and internal surfaces of the building with the outdoor
and indoor climate components are demonstrated. Longwave emission and
shortwave absorption, driving rain and evaporation cooling on the outside and
the adsorption-desorption processes of humidity of the room air inside must be
considered in the management of passive air conditioning to create a permissible
indoor climate in winter and summer periods. A good modelling of the coupled
heat and mass transfer and a validated software play an important role; including
knowing the material parameters of the structures. Results of experimental
investigation and numerical simulation are discussed with regard to the infrared
reflexion of coatings, fluctuation of the relative humidity in the rooms and the
problems of mould and algae growth on the surfaces of the inside and outside
walls. A mixture of phase change materials combined with hygroscopic bulk
materials within envelop parts of buildings will be a solution for an energy
saving passive air conditioning in the future .
Keywords: infrared reflection, energy saving, hygroscopicity, evaporation
cooling, indoor climate, numerical simulation.
1 Introduction
In the past the maintenance of the building envelopes and the protection of the
construction were the most important consideration. Nowadays, the energy
Keywords
infrared reflection, energy saving, hygroscopicity, evaporation
cooling, indoor climate, numerical simulation.
Related Book
Other papers in this volume
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