DESCRIPTION AND ANALYSIS OF A SPECIFIC NUMERICAL SIMULATION TOOL TO SIMULATE DOUBLE SKIN FACADES. APPLICATION TO THE STUDY OF ADVANCED FACADES WITH INTEGRATED COLLECTORS-ACCUMULATORS

摘要

New advanced elements incorporated to facades (glazings, absorber surfaces, phase change materials and transparent insulation) allow to develop each time more modern and efficient facades. Thermal behaviour of buildings may be improved by means of the optimisation of the envelopes, in order to achieve lower values of global heat transfer coefficients and improved solar heat gain coefficients. Furthermore, buildings facades offer large areas that may be opaque. In the case of completely transparent facades, these opaque areas may constitute the indoor layer of a double skin envelope. These areas may be used to collect and accumulate large quantities of solar energy, addressed to get a reduction of energy consumption necessary to heat indoor space. In this paper, a specific numerical simulation code has been used to simulate the thermal behaviour of different designs of double and single skin facades. All of them account with a liquid-based solar collector-accumulator integrated to the facade. By means of a simple heating consumption profile, the possibilities that a facade could offer have been analyzed. An instantaneous analysis has been carried out for a winter day. The long term performance of the designs has been also analyzed by means of the monthly integrated values of total energy delivered by the facade and auxiliary heating load.