Objective
Draught is one of the most serious complaints from occupants in buildings, vehicles, etc. Specifications for draught discomfort appear in the present indoor climate standards. Measurements of air temperature, mean velocity and turbulence intensity of the airflow must be performed in order to assess draught discomfort. Low velocity thermal anemometers are the instruments most used at present to perform these measurements as they are simple to use and inexpensive. The accuracy of the mean velocity and turbulence intensity measurements depends on several factors: the calibration of the instrument and its dynamic behaviour, the directional sensitivity of the velocity sensor and the free convection flow it produces, the design of the sensor and the instrument, etc. Recommendations for the characteristics of the anemometers that will ensure accurate measurements are specified in the standards. The recommendations are based on the separate impact of each of the above factors on the accuracy of the measurements, on the assumption that low velocity anemometers have the same dynamic behaviour. However, recent research shows that their behaviour differs. Furthermore, the accuracy of the low velocity measurements in practice depends on the simultaneous impact of two or more factors on the accuracy of the measurements. This impact can be additive, synergistic or antagonistic. It is difficult and time-consuming to identify this impact experimentally. The accuracy of the low velocity thermal anemometers available on the market is not sufficient to measure draught discomfort as required in the standards and has to be improved. Further, there is a need to define realistic draught requirements in the standards that can be assessed by measurements in practice using low velocity thermal anemometers.
The objectives of the proposed research are:
1) to improve the accuracy of mean velocity and turbulence intensity measure ments made with low velocity thermalanemometers;
2) to analyse and to identify combined effects of error sources for low velocity thermal anemometers and to establish accuracy levels for draught measurement in practice;
3) to make new specifications for draught discomfort in future indoor climate standards;
This research will enable the accuracy of mean velocity and turbulence intensity measurements to be increased by modifying the design of low velocity thermal anemometers and improving their dynamic behaviour. It will establish bases for the development of new measurement instruments. The impact of systematic and non-systematic error sources on low velocity measurements in practice will be analysed. A mathematical model of a low velocity thermal anemometer will be developed. All error sources will be incorporated in the model. A large available database from comprehensive full-scale room measurements of instantaneous velocity (made by a threedimensional laser doppler anemometer) and of instantaneous temperature will be analysed by the model. This will enable the highest accuracy for draught measurement in practice to be identified and will ensure that realistic requirements for draught discomfort in buildings, vehicles, industry, etc. are incorporated in indoor climate standards.
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.
- natural sciences computer and information sciences databases
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
- natural sciences physical sciences optics laser physics
- natural sciences mathematics applied mathematics mathematical model
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Coordinator
2800 Lyngby
Denmark
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