Asolar heating system has a 25.0% conversion efficiency; the solar radiation incident on the panels is 1 000 w/m2.

what is the increase in temperature of 30.0 kg of water in a 1.00-h period by a 4.00-m2 -area collector? (cw = 4 186 j/kg⋅°c)

a. 14.3°cb. 22.4°cc. 28.7°cd. 44.3°c

c. 28.7C

Explanation:

Since the solar radiation incident on the panel is 1000W/m2 and the collector has an area of 4m2. We can conclude that the solar power generated is

1000 * 4 = 4000 W or J/s

Within 1 hour, or 3600 seconds this solar power generator should generate (with 25 % efficiency):

E = 0.25 * 4000 * 3600 = 3600000 J or 3.6 MJ

This energy will be converted to heat to heat up water. Using water heat specific of 4186 J/kg C we can find out how much temperature has raised:

So C. is the correct answer

ill do it for 100, also this isnt 80 its 40

hi i’m sorry to call us today so we will get back with y’all and we will have to do it haha omg was the day