dc.contributor.author |
Dissanayaka, I. S. |
|
dc.contributor.author |
Jayathileke, K. P. S |
|
dc.date.accessioned |
2021-12-20T10:32:57Z |
|
dc.date.available |
2021-12-20T10:32:57Z |
|
dc.date.issued |
2021-02-17 |
|
dc.identifier.issn |
1391-8796 |
|
dc.identifier.uri |
http://ir.lib.ruh.ac.lk/xmlui/handle/iruor/4708 |
|
dc.description.abstract |
Hot-wire anemometers are wind measuring instruments that work on the principle of convectional heat transfer that takes place from an electrically heated hot-wire. They are well popular for the reliable, error-less wind measurements. In addition, their less maintenance cost, lack of mechanical parts and taking comparably less space are some advantages over the other wind measuring instruments. Single sensor hot-wire anemometer allows only for measuring wind velocity. But, dual-sensor hot-wires anemometer allows two-dimensional airflow measurements, which will yield wind velocity and wind direction. A dual-sensor hot-wire probe (X-probe) was constructed using Nichrome (NiCr) as hot-wire material. Dual sensors were fixed to the prongs of the hot-wire anemometer, being perpendicular to each other. X-probe calibration was conducted for velocity fixed winds obtained from a wind generator. It was performed for different orientations of X-probe, facing the wind flow generated by the wind generator. Voltages across two hot-wire sensors were analyzed for different orientations of the two hot-wires of the sensor. Each pair of voltages exhibited a unique variation with different orientations of the two hot-wires sensors to different wind flows. Each set of voltages was plotted and fitted to King's law formula which contains three parameters. Parameter values were used to create a calibration curve. X-probe was tested inside the laboratory using the wind generator and it produces a very accurate value of wind direction and velocity. The look-up table method was used to extract the wind direction and wind velocity. Wind measurements in the outside environment were tested using the X-probe and it showed a fluctuation of the wind velocity and direction. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Faculty of Science, University of Ruhuna, Matara, Sri Lanka |
en_US |
dc.subject |
Dual-sensor hot-wire anemometer |
en_US |
dc.subject |
X-probe |
en_US |
dc.subject |
Wind direction |
en_US |
dc.title |
Fabrication of a dual sensor hot-wire anemometer to measure wind direction |
en_US |
dc.type |
Article |
en_US |