Estimate the number of panels in an array required to supply hot water to a summer home if 100 gal of tap water per day are to be heated from 10 to 50°C. Assume that the average efficiency of the array is 60 percent and that the average daily insolation intercepted by the array is 5 kw-hr/m²-day. Each panel has an area of 1.5 m².
Estimate the number of panels in an array required to supply hot water to a summer home if 100 gal of tap water per day are to be heated from 10 to 50°C. Assume that the average efficiency of the array is 60 percent and that the average daily insolation intercepted by the array is 5 kw-hr/m²-day. Each panel has an area of 1.5 m².
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Transcribed Image Text:Estimate the number of panels in an array required to supply
hot water to a summer home if 100 gal of tap water per day are
to be heated from 10 to 50°C. Assume that the average efficiency
of the array is 60 percent and that the average daily insolation
intercepted by the array is 5 kw-hr/m²-day. Each panel has an
area of 1.5 m².
Consider an array of nine panels arranged in three parallel
strings. Each string has three panels in series. Water flows into
the array at 0.03 kg/sec and divides equally into each string. The
water enters the array at 10°C and leaves at 50°C. The first panel of
each string raises the temperature by 20°C; the second, by 15°C;
and the third, by 5°C. The area of each panel is 1.5 m² and the
intercepted insolation is 800 W/m².
(a) Find the efficiency of each panel of the array.
(b) Find the rate at which heat is collected by the array.
(c) Determine the overall efficiency of the array.
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