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Nuevo método de caracterización térmica de materiales transparentes y semitransparentes mediante medidas externas y simulación dinámica

Resumen

Tipo:
Oferta Tecnológica
Referencia:
TOIT20160311001
Publicado:
05/04/2016
Caducidad:
05/04/2017
Resumen:
Un equipo de investigación de una universidad italiana con experiencia en energía renovable ofrece un nuevo método para evaluar el rendimiento térmico de materiales transparentes y semitransparentes, como cristal aislante difusor de luz, en condiciones operativas reales. Esta metodología es útil para probar nuevos materiales y composites cuyas propiedades térmicas son desconocidas. El equipo de investigación busca centros de investigación, universidades y pymes con el fin de establecer acuerdos de investigación o cooperación técnica.

Details

Tittle:
A new method for thermal characterization of transparent and semi-transparent materials using outdoor measurements and dynamic simulation
Summary:
An Italian university research team with expertise in renewable energy offers a new method to evaluate the thermal performance of transparent and semi-transparent materials such as light diffusing insulating glass, under real operating conditions. The methodology is useful to test innovative materials and composites whose thermal properties are not known.
The partners sought are research centres, universities and SMEs interested in research cooperation or technical cooperation agreement.
Description:
Windows and glazing can offer to building occupants visual relief, insulation against heat and cold, control of light and ventilation. Windows and other fenestrations are of great importance adding esthetical qualities and beauty to the building design.
In recent decades, fenestrations have been often considered for another type of concern: their influence on the building energy consumption. This aspect may have a direct influence on the design and performance of lighting and air-conditioning systems. For this reason, researches on new materials and their properties have grown recently, as for example glazing with the integration of silica aerogel in monolithic form or the use of electro-chromic smart windows.

A common problem, of these new technologies, is that the semi-transparent part is composed by different materials with several physical properties that sometime are not yet defined.
Furthermore, external thermal loads in buildings depend mainly on thermal transmittance and on the solar heat gain coefficient (SHGC) that should be considered to identify the thermal behaviour of glazing systems. In particular, the SHGC is defined as the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and released inward.

The university research team, active in the renewable energy sector with expertise in photovoltaic field, proposes a new methodology that uses devices named Solar Test Boxes (STBs) and a dynamic simulation software.
The STBs are able to evaluate the overall energy performance of innovative glazing systems suitable for energy saving purposes, consisting of layers of different materials whose thermal characteristics cannot be easily retrieved.

The method consists in a short-term outdoor monitoring of STBs thermal behaviour and in a calibrated dynamic simulation model for the boxes. The thermal properties can be evaluated finding the best match between the experimental data and the calibrated model simulation data.
The STBs are instrumented to measure inside air temperature, illuminance and surface temperature of the inner and outer side of the test pane. Outside temperature and relative humidity, solar irradiance on the vertical plane and wind speed and direction can also be measured.

The STBs maximize the thermal contribution of the transparent material allocated on the short side of the box. Each box has five out of six faces heavily insulated to guarantee adiabatic conditions and one face shaped in order to host different kinds of transparent or semi-transparent samples.

The outdoor measurements inside and outside the test boxes are used to accurately calibrate the dynamic simulation model in order to obtain the global thermal transmittance and the solar heat gain coefficient.

The dynamic simulation software allows the building simulation of energy performance, indoor air quality and thermal comfort in dynamic conditions. The software is also able to cover a large range of phenomena, such as the integrated airflow network and thermal models, Carbon dioxide (CO2) and moisture calculation, and vertical temperature gradients.

The team offers its expertise to research centres, universities and SMEs involved in thermal characterization of insulating materials and semi-transparent photovoltaic devices.
The team is interested in research and technical cooperation.

Advantages and Innovations:
The methodology is easily reproducible, low cost, with a low technical impact.
It allows a comparative analysis of thermal and lighting performance of innovative transparent material with respect to a double glass reference pane.
The evaluation of materials is performed under operating conditions meaning the determination of their true performance.

Stage of Development:
Available for demonstration
IPs:
Secret Know-how

Partner sought

Type and Role of Partner Sought:
The research team is looking for research centres, universities and SMEs interested in thermal characterization of innovative insulating materials and semi-transparent photovoltaic devices.
The research team offers research cooperation or technical cooperation agreement to adapt the proposed methodology for a new application.

Client

Type and Size of Client:
University
Already Engaged in Trans-National Cooperation:
Si
Languages Spoken:
English

Keywords

Technology Keywords:
10002007 Tecnología / ingeniería medioambiental