Comparative Analysis of PV Shading Devices for Energy Performance and Daylight

Abstract

The comfort and energy demand of a building are influenced significantly by glazed area of the facade. The glazed areas in the building are always challenging. Large glazing allows more daylight to get into the room but at the same time cause more heat gain and heat loss through the building envelop. Shading devices are very suitable elements for installing PV panels. The aim of this study is to evaluate the potential impact of different PV shading devices on energy performance and daylight of office buildings in Nordic climate.

This dissertation is based on literature studies of relevant books and articles on the solar shading systems and the comparative analysis of different cases. The quantitative data for the comparative analysis is achieved by means of computer simulations using COMFEN, ECOTECT and PVsyst.

The focus of this study is on external solar shading devices. Five different control strategies were analyzed: No shading devices, Overhang, Movable vertical blinds, Movable horizontal blinds, PV integrated in glass. These shading systems are applied to three facades: south, west and east facades. Comparable assessments have been conducted in terms of window heat gains, energy consumptions, energy production of PV cells, daylight and glare. The outcome of this effort would be used in practical projects such as powerhouse one.