» Current Issues and Publications

Energy Efficiency In Buildings: A Parameter for The Thermal Qualification of Opaque Building Envelope

An eight-page building simulation paper. A new parameter å (0≤å≤1), called coefficient of performance, is introduced, whose value quantifies the suitability of the distribution of resistive and capacitive layers in a multi-layer wall, within problems concerning thermal building-plant interaction in case of external sinusoidal or impulsive thermal variations. After giving an integral expression for the calculation of å, the coefficient’s of performance properties are discussed; simple relations allowing to evaluate the value of å in case of walls made of two materials only, i.e. of a capacitive layer followed by a resistive one (two-component walls), are also deduced. The developed analysis shows that the optimal ideal wall, to which the maximum value of å corresponds (å=1), is the lumped-parameter, three-layer, symmetrical one, obtained by lumping all capacity in the mid-plane of the wall and by distributing the resistance, split up into two equal slabs, on the faces. Finally, the coefficient’s of performance values for different two component walls, realized with materials commonly used in building, have been calculated. Read More

Using DOE 2.1E to Evaluate Green Building Construction Opportunities and Ventilation Design for Lotus School

An eight-page building simulation paper. In the standard design process of a building, total building simulation using building simulation software is encouraged to be incorporated into the design process as early as possible. However, this paper demonstrates that building simulation can be used as late in the process as the early construction phase of a building project, though usually with increasing cost of building modifications. Using building utility budget as an indicator, the options presented through use of building simulation tools can justify the change to the design or construction, by showing a reduction in the expected operational costs over the lifetime of the building. DOE 2.1E available at http://doe2.com/DOE2/index.html. Read More

Technical and Economical Interest of Sustainable Refurbishment Technologies in France, Italy and Finland

An eight-page building simulation paper. The aim of the European SSHORT (Sustainable Social Housing Refurbishment Technologies) project is to increase and promote rational and efficient use of energy in the retrofitting of social housing buildings. In this scope, one step was to evaluate with simulation studies the technical and economical interest of selected sustainable technologies on standard collective social housings in participating countries. Selected technologies are dual flow ventilation with heat recovery, solar energy systems (solar domestic hot water (solar DHW), photovoltaic panels) and building energy management systems. Each partner was in charge to study the potential interest of one selected technology for each participating countries. According to studied technology, simulations have been conducted with f-Chart method, TRNSYS and CA-SIS tool (Electricité de France (EDF)’s tool based on TRNSYS models). The paper proposes to present the methodology to conduct studies, simulation results and main conclusions about the potential interest of selected technologies in the retrofitting social housing sector. Refers to specific software tools that may not be available. Read More

Congressional Research Service Reports: International Finance

The NLE currently posts 2048 CRS Reports on environmental and related topics. The Congressional Research Service (CRS), part of the Library of Congress, prepares its reports for the U.S. Congress. CRS products undergo review for accuracy and objectivity and contain nontechnical information that can be very useful to people interested in environmental policy. CRS does not itself provide these documents to the general public. Although CRS documents are prepared specifically for Congress and not widely distributed, their distribution is not protected by law or copyright. NCSE is committed to expanding, maintaining and updating its database of reports, making them available and searchable for the public. Read More


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