Cold water flows to the solar panels at 15°C. During the day, the panels supply 3.8 kg of hot water at 65°C every hour. (a) Calcul

Question

Cold water flows to the solar panels at 15°C. During the day, the panels supply 3.8 kg of hot water
at 65°C every hour.
(a) Calculate the average energy that the solar panels deliver to the water in one hour.
Specific heat capacity of water = 4200 J/(kg°C). ​

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Linh Đan 2 weeks 2021-09-01T14:20:10+00:00 1 Answers 0 views 0

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    2021-09-01T14:21:51+00:00

    Answer:

    The average energy that the solar panel delivers to the water in one hour is 798,000 Joules

    Explanation:

    The given parameters are;

    The temperature of the water that flows to the solar panels, T₁ = 15°

    The mass of the hot water the panel supplies during the day, m = 3.5 kg

    The temperature of the hot water supplied by the panel, T₂ = 65 °C

    The heat capacity of the water, c = 4,200 J/(kg·°C)

    The heat delivered to the solar panels in one hour, ΔQ, is given by the following formula

    ΔQ = m·c·ΔT

    m = 3.8 kg, c = 4,200 J/(kg·°C), and ΔT = T₂ – T₁ = 65 °C – 15 °C = 50 °C

    ∴ ΔQ = 3.8 kg × 4,200 J/(kg·°C) × 50°C = 798,000 joules

    ∴ΔQ = 798,000 joules

    The average energy that the solar panel delivers to the water in one hour, ΔQ = 798,000 joules.

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