Paper Conference

Proceedings of BSA Conference 2013: 1st Conference of IBPSA-Italy


Energy and daylighting interaction in offices with shading devices

Francesca Mazzichi, Marco Manzan

Abstract: Office buildings represent a challenge for reducing energy consumptions due to climatization, since they are characterized by high internal loads due to electronic equipment and illumination. Furthermore they are also characterized by large transparent surface areas in order to guarantee sufficient daylighting. The combination of these factors leads to high energy costs due to both internal and high solar loads. Furthermore, to guarantee healthy work places, glare problems should also be taken into account. To avoid glare and solar radiation, fixed or movable shading devices are usually provided. Nevertheless the interaction of these devices with the heating, cooling and lighting plant is not simple, since they affect both the loads and the illumination distribution, and their impact on global energy consumption should be analysed for a real energy efficient design. In the present paper different types of shading devices, fixed, movable and combined are analysed by means of computer codes and a comparison of the energy performance of each system has been carried. ESP-r has been used in order to study the energy behaviour of the building, while the lighting simulation package DAYSIM has been used to predict the consumption of the artificial illumination system. DAYSIM can provide the energy code ESP-r with internal loads due to illumination for an energy simulation. Since the deployment of movable devices is automatically controlled by DAYSIM, in order to couple the two codes, the ESP-r source code has been modified introducing a controller to activate the movable shading devices in synchronous with the daylighting analysis. The results obtained with different shading devices are compared in terms of energy required for heating, cooling and lighting and also in terms of daylight distribution using distributions of useful daylight illuminance.
Pages: 385 - 394