Wind Power Flashcards
Pitch of blade (how much it is turnt perpendicular to the wind) should be…
Between 0 and 5 degrees. Try to twist the blade in some way so tht the pitch is 0 near tip and 10-20 degrees near root
How many blades should you use?
2-3
Equation for wind power (watts)
P=1/2 • density of air (kg/m3) • pi • radius of swept area squared (m squared) • wind velocity (m/s)
Which climates are better for producing wind, warm or cold?
COLD, because higher DENSITY of air causes more watts of wind power, as long as the air is not to thin in high elevations
Equation for power (watts) after using a multimeter to find voltage/amperage?
Power (watts)=voltage (V) • current (A)
Lightweight vs heavy blades?
Lightweight blades will give you more speed, but heavier will give u more momentum/power. This year use heavyish blade bc they are using resistors
Hydroelectric
Uses turbines like wind. Store energy for necessary times. Reservoirs by dams concern environment. Tidal power can also be used…its predictable but doesn’t produce as much power
Ocean thermal energy conversion (OTEC)
Utilizes difference in temp from shallow to deep water. Heat goes from warm>cooler water, engine converts flow to energy. Constant but expensive and limited locations
Geothermal
Underground heat>energy. Constant, cost effective, environmentally friendly, but limited to locations with tectonic plate movement
Calculating Joules
Force in newtons (N) • Distance travels (M)
Power
Rate at which work (Joules) is performed… Joules/time
Fahrenheit freezing/boiling points
32 degrees and 212 degrees (180 degrees apart)
Celsius to kelvin
K=’C+273
Rankine
Basically, kelvin is to Celsius as Rankine is to Fahrenheit. ‘R=460+’F, 0’R is absolute 0
Fahrenheit to Celsius
C=5/9(F-32)
Conduction formula
Q=kA(hot temp-colder temp) divided by d (k is in watts/mK; A is in m squared; d is in in m)
Convection formula
Q=hA(hot temp-cooler temp) (h is in watts/m squared K)
Stefen-Boltzmann law for radiation
P=eóA(radiating source temp-surrounding temp)
