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How low should be the energy required by a nearly Zero-Energy Building? The loa...

Directive 2010/31/EU adopted that by the end of 2020 all new buildings should be nearly Zero-Energy Buildings (nZEB) and Member States should achieve cost-optimal levels by ensuring minimum energy performance requirements for buildings. This paper discusses how low should be the energy required by a nZEB, in the context of housing energy consumption in a Mediterranean climate (Lisbon). For selected houses built...

New energy performance indexes for energy-efficient interactive buildings

This paper argues that promoting energy supply by Renewable Energy Sources (RES) in buildings, namely residential, requires additional informative indexes to be included in buildings Energy Performance Certificates. The load-generation approach for the energy balance is here discussed, and compared with the current recommended by CEN/TR 15615, i.e. the delivered-exported approach. Besides the Energy Performance...

Solar Load Ratio and ISO 13790 methodologies: Indirect gains from sunspaces

This paper reviews and analyzes the compatibility of the simplified empirical method based on the dimensionless parameter of Solar Load Ratio (SLR) and the monthly procedure of the standard ISO 13790 for indirect gains, specifically for unconditioned zones adjacent to a conditioned zone, but separated from it by a partition wall (sunspaces). The main contribution of the work presented here is the new formulatio...

Energy Efficiency Plan in Public Sector in Portugal

January 2011 the Energy Efficiency Programme in Management Public - Eco.AP Project, a rolling program, to: increase the energy efficiency of Public Administration services, buildings and equipment, target of 30% by 2020, contracts with ESCOs to obtain, in a cost-effective, improvements in efficiency.

Em direcção à Energia Zero/Towards Zero Energy

Solar XXI Building: Towards Net Zero Energy Buildings NZEB

Assessement of the Portuguese building thermal code: Newly revised requirements...

In this paper, cooling energy needs are calculated by the steady-state methodology of the Portuguese building thermal code. After the first period of building code implementation, re-evaluation according to EN ISO 13790 is recommended in order to compare results with the dynamic simulation results. From these analyses, a newly revised methodology arises including a few corrections in procedure. This iterative r...

The keep Cool II idea and strategy: from "cooling" to "sustainable summer comfort"

The European Energy Performance of Buildings Directive (EPBD) explicitly refers to a "passive cooling techniques, primarily those that improve indoor climatic conditions and the microclimate around buildings". However, in Europe the demand for air conditioning is rising, especially in office buildings and is expected that the cooled floor area will be four times higher in 2020 when compared with 1990 figures. A...

Portuguese thermal building legislation and stategies for the future

Portugal must evaluate, according to the Energu Performance Building Directive, the national requirements for energy performance of new buildings until 2011, which can be an opportunity to devise a national stretegy that tightens the minimum energy performance requirements. The present study intends to analyze the changes that should be introduced in the Portuguese Regulation to achieve highl energy efficient b...

Towards sustainable Summer comfort

There is a growing energy demand for cooling in European buildings. It is expected that the cooled floor area will be four times higher in 2020 when compared with 1990 figures. Cooling is already the energy use in the building sector with the highest increase rate. This evidence is not contributing to the overall objective of reduction CO2 emissions. The conventional answer to this problem is to improve of the ...