Objective
The heat transmission through double glazed windows is for a large extent determined by the heat barrier created by the gap between the two sheets of glass. The gap must be small enough to avoid convection, the filling gas should have minimum thermal conductivity. When these conditions are satisfied there remains the need to minimize radiation. The amount of heat radiated by a surface is proportional to its emissivity. The emissivity of normal glass is close to one (0.9) and to reduce it one applies reflecting coatings on the glass.
New coatings are still being developed although this technique has already a very wide application.
The determination of the emissivity can be done by spectrophotometry or by means of radiometry. Measurements are difficult and of relatively high uncertainty.
The objective of the project was therefore to study a simplified method (based on the use of reference materials) and with an uncertainty not higher than a few per cent.
RESULTS
A new procedure has been developed and tested which allows the evaluation of the total normal and hemispherical emissivity of the surface of solids in the temperature range between 50 C and 100 C, in a considerably shorter interval than with conventional procedures. The receiver system has been calibrated in such a way that no comparison measurements must be carried out between sample and blackbody; this calibration can be checked and controlled with reference samples. The uncertainty is of 0.02 for the total normal emissivity and of 0.03 for the total hemispherical emissivity. Suggestions are given to extend the useful temperature range.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering coating and films
- engineering and technology materials engineering amorphous solids
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
BRAUNSCHWEIG
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.