How do I determine the size of the overhang on a shallow deck on my home so that it allows in winter sun but blocks direct summer sun?
-Mark in Iowa
Feb. 5, 2016
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Xiaohui Zhou, Ph.D., P.E.
Program Manager

Sunlight shining on window surface is a function of latitude, cardinal direction, dimensions of the [...]

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Is it practical to construct a PV array system on old barn roofs rather than tear the barns down?
-Joel in Iowa
Oct. 26, 2015
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Bill Haman, P.E.
Program Manager

Even if the orientation of the barns is ideal for solar PV, the condition of [...]

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Our electric bill averages $300 a month. Would solar be an option for our shop or would the payback be too far out?
-Dave in Iowa
Oct. 7, 2015
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Bill Haman, P.E.
Program Manager

The feasibility of a distributed renewable energy system is determined by analyzing the cost and [...]

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Why does wind power increase as the cube, not the square of speed?
-Richard in Seattle
Oct. 7, 2015
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Bill Haman, P.E.
Program Manager

The kinetic energy of the wind can be expressed by the equation: K.E. = 0.5mU2 [...]

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What should the humidity level in my home be during summer months in Iowa?
-Jaime in Iowa
Aug. 25, 2015
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Iowa Energy Center
Staff

Most people are comfortable with relative humidity percentages between 30% and 50%. Humidity above 65% [...]

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Are the average solar production rates provided in the Iowa Energy Center solar calculator based on a panel size of 1 kwh per sq meter of panel?
-Mike in Iowa
Jun. 30, 2015
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Bill Haman, P.E.
Program Manager

The Iowa Energy Center Solar Calculator provides the energy output of a PV system sized [...]

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