Tecniche de retrofitting per edifici. Retrofitting actions on building.

Short analysis of possible retrofitting operations on the building envelope and on the heating system to save energy. An analysis of residential buildings in various parts of Italy has been performed using the Italian national calculation procedures (UNI) for the evaluation of winter energy need. A more detailed analysis in envisaged to extend the data obtained, using more sophisticated codes in order to calculate the annual energy consumption of the building. This would define normalised energy indices to ensure a more energy aware design.

Measured pressure-equalized performance of two precast concrete panels - performance of pressure-equalized rainscreen walls. A collaborative research and development project.

Describes the results of the experimental evaluaton of two precast concrete sandwich panels. States that for best results for precast concrete walls, the air barrier must be sufficiently airtight to achieve static pressure equalization and there must be sufficient venting to achieve dynamic pressure-equalization. Similar results were obtained from research conducted on other wall systems. For precast concrete walls, these results are best obtained by minimizing the cavity volume and decreasing air barrier leakage before increasing vent area.

Determination of water vapour diffusion across brick masonry treated with water repellent sealers.

Describes the experimental evaluation of a brick veneer steel stud (BVSS) test specimen. The system was evaluated for air leakage characteristics, pressure equalization response, deflection and water penetration. Concludes that for best results for BVSS walls, the air barrier must be sufficiently airtight to achieve static pressure equalization and there must be sufficient venting to achieve dynamic pressure equalization. Similar results were obtained from research conducted on other wall systems.

Energy conservation in buildings with integration of advanced ventilated wall components.

The performance of a Ventilated wall component under real weather conditions was tested, during two weather seasons, winter and summer. The component was built in a 1:1 scale, consisting of two equal area parts, a Ventilated wall with and without a radiant barrier. It was installed at the South faade of a PASSYS outdoor Test Cell at CRES. Air openings were located at the bottom and top of each wall component in order to facilitate the air movement through the air gap.

Dynamic insulation - recent experimental and theoretical studies.

Dynamic insulation is a very good example of a ventilation system integrated with the building envelope. The paper describes two recent studies carried out at Nottingham on dynamic insulation. One study concerns a system based on mechanical ventilation. The other describes a purely natural system. Although there are few existing applications of dynamic insulation, it is argued that there is potential for both systems, particularly with certain types of building. The natural system is technically more challenging than the mechanical system, but the potential energy savings are larger.

Barriers to the integration of cladding and building services.

This paper briefly exams the role of the building envelope in determining the internal environmental conditions in buildings and the scope for holistic design of building services and building envelope. It then looks at how holistic design may be undertaken, the barriers to be overcome to enable this to happen and the incentives that are necessary.

Effectiveness of passive ventilation functions of 'Breathing Wall' under natural weather conditions.

A scale mock-up house installed with a "Breathing Wall" was constructed outdoors in order to consider the practical application of breathing walls in houses in temperate-climate regions. It was found that, under outdoor weather conditions, the Breathing Wall provides the necessary amount of ventilation, thermal insulation and moisture transmission required for application in a temperate climate region. No adverse effects on the indoor environment were found even when cold outdoor air flowed through the Breathing Wall.

Monitoring the performance of an EIFS retrofit on a 15-storey apartment building.

The research project had the following objectives: document the development of a building envelope retrofit strategy for a high rise apartment building; monitor, assess and document the performance of a high-rise apartment building envelope retrofit withrespect to heat, air and moisture control; assess the degree to which the monitoring protocol can be implemented as part of regular operation and maintenance activities for new and existing building; and assess the potential for the development of a commercially viable, building envelope performance monitoring protocol.

Effect of 2D modelling of thermal bridges on the energy performance of buildings. Numerical application on the Matisse apartment.

Discusses the accurate evaluation of the effect of thermal bridges on building energy performance using a modelling approach. Sisley software was used first of all to model the heat transfers in the intersections of walls. CLIM 2000 was used to reduce and integrate the models. A comparison was done between these results and the models obtained from thermal regulation values. It appeared that detailed modelling of heat transfers would provide an increased accuracy of around 5% when evaluating the building heat loss.

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