Chapter 5 Multiple Choice Questions

Quiz Content

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1) In what period of time does the Earth receive as much energy from the Sun as is consumed globally in one year?

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2) The percentage of the world's energy consumption in buildings from space heating or cooling and heating water is approximately…

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3) Which is the more efficient solar thermal collector?

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4) Selective emitters are used in solar thermal applications to ______.
Please select all that apply.

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5) The radiative power absorbed by a receiver at a temperature T is that concentrated on to it, less the amount _____ ______ which depends on T⁴.

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6) An air-source heat pump powered by electricity with a carbon intensity of 0.4 kg CO2 per kWh is available as an alternative to gas heating. Which one of the following would be more efficient?

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7) Which is the correct expression for the coefficient of performance of an ideal heat pump, where the internal temperature is T2 and the external one is T1?

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8) GSHP stands for _____ _____ _____ .

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9) What statements about concentrated solar thermal power (CSP) are true? Please select all that apply.

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10) Which of the following statements about concentrated solar power (CSP) are correct? Please select all that apply.

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11) Match the conversion efficiencies to the technologies.

11a.

~3.5%

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11b.

~10%

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11c.

~2%

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11d.

~20%

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12) The dependence of the volume flow rate Q through a porous rock of cross-sectional area A and thickness L on the pressure drop Δp and viscosity of the water μ is of the form…

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13) Where would you expect to find geothermal power plants?
Please select all that apply.

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14) What is the thermal energy stored in 2 km3 of granite at a temperature of 250 °C? The density and specific heat of granite are 2700 kg m3 and 790 J kg1 °C1, respectively.

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15) What statements apply to enhanced geothermal systems?
Please select all that apply.

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16) Heat diffuses a distance of ~ (kt)1/2 in a time t, where k is the thermal diffusivity of rock ~ 10-6 m2 s-1. Over what distance will heat diffuse in 4 years?

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17) The global geothermal power resource is estimated to be…

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18) Match the accessible potential by 2050 to the technologies.

18a.

3000 TWh y-1

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18b.

4000 TWh y-1

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18c.

2000 TWh y-1

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18d.

1800 TWh y-1

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