H. Gonfalves, A. Silva, A. Ramalho, C. Rodrigues

INETI, Department of Renewable Energies, Campus do Lumiar do INETI, 1649-038 Lisbon, Portugal
Corresponding Author, helder. goncalves@,ineti. pt

Abstract

This paper presents the thermal performance of a Passive Solar Office Building in Portugal in winter and summer 2006 and 2007. This Building, called Solar XXI, pretends to be an example of passive design both for heating and cooling. It contains a direct gain system assisted by a solar thermal system for winter conditions. In summer a ground cooling system (buried pipes) is used to cool the building, together with night cooling strategies. It also integrate in the vertical south envelope a Photovoltaic System (12 kWp) which provide around 12 MWh per year plus a 6kWp in the car parking, which correspond to around 76% of the electric energy consumption of the building. The integration of the PV system, in the building was done in such a way, that it is possible to recovery the heat production from the PV in order to be used for heating purposes Keywords: Passive heating and cooling (ground, night ventilation), PV heat recovery

1. Introduction

The main goal of this project was the design of an office building, with low energy consumption, integrating renewable technologies (Solar thermal and Photovoltaic System) and passive systems for heating and cooling purposes, full integrated in the architecture design. The building pretend to be an example for new projects and it is an experimental facility of INETIs Renewable Energy Department. The building has 1500m2 in three floors, with the main occupied spaces in the south of the building and the less occupied rooms in the north part of the building.