Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 28 Sep 2017 My Price 7.00

solar radiation

1.85   A solar flux of 700 W/m2 is incident on a flat-plate solar collector used to heat water. The area of the collector is 3 m2, and 90% of the solar radiation passes through the cover glass and  is  absorbed  by  the  absorber plate. The remaining 10% is reflected away from the collector. Water flows through the  tube  passages on the back side of the absorber plate and is heated from an inlet temperature Ti to an outlet temperature To. The

cover  glass,  operating  at  a  temperature  of  30°C, has

an   emissivity   of   0.94   and   experiences   radiation exchange with the sky at -10°C. The convection coef- ficient  between  the  cover  glass  and  the  ambient  air  at 25°C is 10 W/m2 · K.

 

 

Cover glass

 

Air space

Absorber plate Water tubing

 

Insulation

 

 

 

(a)   Perform an overall energy balance on the collector to obtain an expression for the rate at which useful heat is collected per unit area of the collector, q"u. Determine the value of q"u.

(b)   Calculate the temperature rise of the water, To - Ti, if the flow rate is 0.01 kg/s. Assume the specific heat of the water to be 4179 J/kg · K.

(c)   The collector efficiency 77 is defined as the ratio of the useful heat collected to the rate at which solar energy  is  incident  on  the  collector.  What  is  the value of 77?

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Maurice Tutor
(5)
Status NEW Posted 28 Sep 2017 10:09 PM My Price 7.00

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