Energy 3

Question 1

In 2018, what was the energy intensity for Ireland?

Answer 1

282.6 toe/€m (tonnes of oil equivalent per million euros) Source: SEAI

Question 2

In 2018, what was the carbon intensity of energy supply in Ireland?

Answer 2

437 gCO2/kWh Source: SEAI

Question 3

Write down an expression for the potential energy of a mass, m, at a height, h above the datum.

Answer 3

Potential energy, PE=mgh

Question 4

Write down an expression for the kinetic energy of a mass, m, moving at a constant speed, v .

Answer 4

Kinetic energy KE=1/2mv^2

Question 5

Approximately, what is 1 horsepower in kiloWatts?

Answer 5

1hp = 0.746 kW

Question 6

In 2019, approximately what was the TPES of Ireland as an average power (i.e. in Watts)?

Answer 6

18.15GW

Source: IEA Energy Atlas

Question 7

In 2019, approximately what was the TPES of Ireland as energy in that year (e.g. in TWh or ToE)

Answer 7

31.4 Mtoe or 348.16 TWh

Question 8

In 2019, approximately what was the TFC of Ireland as an average power (i.e. in Watts) ?

Answer 8

15.17 GW

Source: IEA Energy Atlas

Question 9

In 2019, approximately what was the TFC of Ireland as energy in that year (e.g. in TWh or ToE) ?

Answer 9

TWh = GW x hours x days in a year

TWh = 15.17 x 24 x 365
approx 133.3 TWh

*NOT CORRECT

Question 10

In 2019, approximately what was the demand for electricity in Ireland as an average power (i.e.
in Watts)?

Answer 10

3.52 GW

Source: IEA Energy Atlas

Question 11

In 2019, approximately what was the demand for electricity in Ireland as energy in that year
(e.g. in TWh or ToE)

Answer 11

According to the SEAI 2021 Energy in Ireland report:

Demand for electricity reached 28.7 TWh (0.8%) increase from 2019.

So approximately 28.47 TWh

*PROBABLY CORRECT

Question 12

In 2019, what was the total average electrical power demand per capita in Ireland (kW/person)?

Answer 12

0.659 kw/person

source IEA Energy Atlas

Question 13

In 2019, what was the residential average electrical demand per capita in Ireland (kW/person)?

Answer 13

Average typical household electricity power use:

• 4200 kWh per year = 11.5kWh/day = 0.48kW
  (CRU – energy regulator)
• 2.75 people per household (CSO)
• Domestic electricity power use per person:
  0.48kW/2.75= 0.175kW= 175 Watts

Source: Lecture Notes

Question 14

Approximately, what proportion of global electricity production depends on a turbine of some
sort?

Answer 14

95%

Source: Lecture Notes

Question 15

What would be a typical power rating for a steam turbine for utility scale electricity generation?

Answer 15

Depends on the size of the power plant.

Could range from 50MW - 1500MW