SIMULATION OF THE DOUBLE FACADE IN THE BRNO METROPOLITAN LIBRARY

Objective of this paper is to present results from experimental measurements and computer simulations of thermal behaviour and energy efficiency of the solar double skinned ventilated faade of the Brno Metropolitan Library in Brno in the Czech Republic. Simulations were provided for the period of heating season between September and April and for the reference climatic conditions with hourly climatic data in the format TRY created for the South Moravia climatic region. The paper deals with the simulation of 1- zone and 9-zone models of 6 variants of the double solar ventilated faade integrated into the central air heating and ventilation system of the building.Simulations and modelling of the double faade were carried out by the last version of the BSim 2002 software. For the modelling of the double faade was specified air change rates to zones and airflow network for bulk airflows through the external and internal envelope of the double faade presenting infiltration or exfiltration. In this modelling is specified for the external envelope a leakage network consisting of a number of internal and external nodes connected by a variety of airflow component such openings, lowers, fans and gaps between components. The internal surface convective transfer process and air flow in the channel of the cavity of double faade are influenced by forced convection during the operation of central ventilation and air space heating system during winter season. External convection coefficient calculation is based on empirical relationship between wind speed, wind direction, surface orientation and geometry of the building. During the simulation the solar processor calculated the incident direct and diffuse radiation on the external surface of the solar double faade.For analysis of results from the simulations and measurements of the solar double faade are compared courses of temperatures in the cavity of the faade, climatic data and energy balances for the heating season.