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Variable Frequency Drives are used in HVAC systems to control or vary the speed of Fans and Pumps. Over half of the electrical energy in a commercial building is used to move air via fans and water via pumps through the building to Heat and cool the building. Pumps and Fans are usually oversized or sized for the worse case conditions.
Without a Variable Frequency Drive they run full speed at all times using a tremendous amount of energy. The Variable Frequency Drive allows the Pump or Fan to run at different speeds depending on the need. This saves huge amounts of energy.
Due the Affinity Law for Fans and Pumps reducing the speed by 10% saves 21% in energy, reduce the speed by 20% = a 49% energy reduction
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What variable affect the frequency in a xylophone?
The length of the [wooden] blocks.
How do you solve for variable fx in statistics?
It depends on whether fx denotes frequency times variable value or the probability generating function for the variable x.
What is the Differences between absolute frequency and relatative frequency?
The absolute frequency is the total amount of occurances of one variable. The relative frequency is the absolute frequency divided by the total amount of occurances of ALL variables.
Words that are related to statistics?
* Probability * Correlation * Validity * Reliability * Variable * Frequency distribution
What is the dependent variable when the independent variable is temperature?
It is an observable phenomenon that changes in response to temperature. For example, if we raise the temperature of a metal wire, it will begin to emit radiation which increases in frequency as the temperature increases. The radiation frequency is the dependent variable here.In any event, you the experimenter determine which variables you wish to study. If you believe that but one variable might depend on temperature, be aware that's nonsense!
