How do you calculate wind speed data?
The best way to get site-specific wind information is to install an anemometer and to collect data for at least one year. (The anemometer should be at the same hub-height as the planned wind turbine.) Installing a tower and anemometer can be expensive. Most homeowners cannot afford to collect anemometer data.
How are winds measured at a site?
Anemometers measure wind speed and wind vanes measure wind direction. A typical wind vane has a pointer in front and fins in back. When the wind is blowing, the wind vane points into the wind. For example, in a north wind, the wind vane points northward.
How do you measure wind speed without equipment?
A much simpler way to measure wind speed is with a ribbon tied to a stick. Once calibrated, the device will allow the casual kite-flyer or sailor an indication of the wind speed. Place the three ribbons on top of each other and tie them together on one end.
What units are used to measure wind speed?
A number of different units are used to indicate wind speed, including meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s) and knots (kt).
What unit do you use to measure wind speed?
The instruments used to measure wind are known as anemometers and can record wind speed, direction and the strength of gusts. The normal unit of wind speed is the knot (nautical mile per hour = 0.51 m sec-1 = 1.15 mph).
What is the difference between an anemometer and a wind vane?
Hint: A wind vane is a device to measure the direction of the wind. An anemometer is a device useful for measuring the wind speed and direction both. It is also used as a common weather station instrument.
How do you measure wind speed at home?
The speed of that wind can be measured using a tool called an anemometer. An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed.
What are the columns on the worksheet for wind speeds?
The worksheet contains the following columns: V= maximum annual wind speeds in miles per hour (sorted from lowest maximum to highest maximum) m= rank of the wind speeds from lowest to highest
How can I calculate the wind speed of a 100-year wind?
Pv= 1 – (1/100) = 0.99 -LN(-LN(0.99)) = 74.271. So for this particular example, the 100-year wind is found to be approximately 74 mph. This computation can be performed for any desired return period.
Where does the data for extreme wind speeds come from?
The remaining columns were computed in Excel. This data is originally from Simiu, Changery, and Filliben (1979), “Extreme Wind Speeds at 129 Stations in the Contiguous United States,” NBS Building Science Series 118 (BSS 118). Data for Example in HTML Table
How do I sort the annual wind speeds in Excel?
Once the maximum annual wind speeds were entered into the Excel spreadsheet, they need to be sorted in ascending order from the smallest to the largest. This can be accomplished in Excel by selecting the “Data” button on the toolbar at the top of the page.