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Q:

Primary energy consumption in 2019

A:

~150.000 TWh (~18 TW) ≅ 14.000 Mt oil equivalent ≅ 500.000 liters of oil per second

Q:

Energy Consumption of the Human Being

A:

For one person:

10 % Heat

30% Physical Activity

60 % Basic Metabolic Function

• Food Only: ~ 2 kWh/day or 0.08 kW average power

• Stone Age:

• Hunter/Gatherers: ~0.24 kW

• Farmers: ~0.6 kW

• Current Age:

• Germany: ~6.5 kW

• Japan: ~3.5 kW

• USA: >10 kW

• World average consumption per person: ~2.3 kW

Total world energy consumption in 2050:

1x10 10 humans x 2.3 kW/human = 2.3x10 10 kW = 23 TW

10 % Heat

30% Physical Activity

60 % Basic Metabolic Function

• Food Only: ~ 2 kWh/day or 0.08 kW average power

• Stone Age:

• Hunter/Gatherers: ~0.24 kW

• Farmers: ~0.6 kW

• Current Age:

• Germany: ~6.5 kW

• Japan: ~3.5 kW

• USA: >10 kW

• World average consumption per person: ~2.3 kW

Total world energy consumption in 2050:

1x10 10 humans x 2.3 kW/human = 2.3x10 10 kW = 23 TW

Q:

In Germany, almost 30 Mio. tons CO2-equivalent of greenhouse gas emissions were avoided die to PV electricity.

A:

Yes

Q:

In the lecture, the orbit of the earth is assumed to be circular. Calculate the variation of the solar constant in W/m² during the course of the year with the maximum and the minimum distance Earth-Sun being reciprocally Rmin = 1,47E8 km and Rmax = 1,52E8 km.

A:

92

Q:

Global Fossil Fuel Reserves

A:

• Oil: 50 years

• Natural Gas: 51 years

• Coal: 132 years

• (Lithium: 225 years)

• Natural Gas: 51 years

• Coal: 132 years

• (Lithium: 225 years)

Q:

As a green energy source, biomass witnessed a consistent increase of usage in transportation sectors recently.

A:

No

Q:

The surface tension gives rise to an additional force facilitating the formation of waves?

A:

No

Q:

Assume a g* =0,16 for the ocean and the average wind speed at 10 m above the sea level is around 10 m/s estimate the wind speed in m/s at a height of 100 m. (with an accuracy of one decimal place)

A:

14

Q:

Which type of chlorophyll dimer is involved in Photosystem I

The number in the name indicates

A:

P700

The wavelength of absorption maximum

Q:

What is the atmospheric CO2 concentration in 2019 in ppm? (with three significant digits)

A:

412

Q:

Use an ideal atomic gas with 7.2E23 molecules for an adiabatic CAES. Suppose the starting temperature is 300 K, how much energy is stored if the gas is compressed from 1 atm to 2 atm? Give the answer in J with one decimal point accuracy.

A:

1442,7

Q:

Assume k=2, λ= 100m/s, which wind speed in m/s has the largest probability density?

A:

70,71

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