A hot-water heater is operated by solar power. If the solar collector has an area of 6.0 m2 and the power deli?

NetherCraft 0

A hot-water heater is operated by solar power. If the solar collector has an area of 6.0 m2 and the power delivered by sunlight is 550 W/m2, how long will it take to increase the temperature of 1 m3 of water from 23°C to 61°C?

1 Answer

  • Rate of heat supply = 550 J/s x 6.0m² = 3300 J/s

    Heat energy required H = m.s.∆θ

    H = (1000kg)(4200 J/kg.ºC)(38ºC) = 1.60^8 J

    t = 1.60^8 J / 3300 J/s .. .. ►t = 4.84^4 s .. (13.4 hr)

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