20 Answered Questions for the topic Sustainable Energy

08/18/17

#### Does thinking holistically mean considering the whole system instead of each part or considering how each part relates to the rest of the part in a system?

Does thinking holistically mean considering the whole system instead of each part or considering how each part relates to the rest of the part in a system?
Sustainable Energy

11/11/14

Australia has a uranium resource equivalent to 700,000 petajoules (PJ). If this resource was divided equally amoung the worlds population of 7 billion people over a 1000-year period, what would be... more
Sustainable Energy

11/11/14

#### Need some help . Thank you !

A particular algae can be grown at a rate of 30 grams per square metre per day, producing 0.048 litres of biodiesel with an energy density of 9.8 kWh per litre. If it was necessary to produce... more
Sustainable Energy Science Physics Engineering

11/10/14

#### how many square kilometres of algae farm would be needed?

A particular algae can be grown at a rate of 30 grams per square metre per day, producing 0.016 litres of biodiesel with an energy density of 9.8 kWh per litre. If it was necessary to produce... more
Sustainable Energy Science Physics Energy

11/10/14

#### Calculate the energy cost (kWh/p/d)

Australia produces 20 megatonnes (Mt) of alumina every year, where each tonne requires 3.8 MWh of heat energy to produce. Calculate the energy cost (kWh/p/d) to produce alumina spread across the... more
Sustainable Energy Math Science Physics

11/09/14

#### Calculate the cost of the electricity consumed (in cents).

A 99 W lightbulb is switched on for 4 hours. Calculate the cost of the electricity consumed (in cents), if the electricity tariff is 25c per kWh.
Sustainable Energy Science Physics

10/18/14

#### What is the average kWh/d per person in Sydney due to aluminium smelting?

Tomago aluminium smelter located near Sydney has a rated capacity of 520,000 tonnes of aluminium per year. The production of each kilogram of aluminium requires 15 kWh of primary energy to smelt... more
Sustainable Energy Science Physics Energy

10/17/14

Chickens require 0.075 kWh per day of energy (as feed) for each kilogram of animal, and 2/3 of an adult chicken is edible meat. The lifespan of a chicken is 50 days.What is the daily energy... more
Sustainable Energy Science Physics Energy

10/14/14

Typical fresh water usage is approximately 150 litres per day per person. If all of this water came from a desalination plant with an energy cost of 4 kWh(e)/m3 what percentage would this be of the... more
Sustainable Energy Science Physics Energy

10/14/14

What is the average power per m2 of floor space for a 100 m2 apartment with a leakiness (heat-loss coefficient) of 9 kWh per day per oC and an average inside/outside temperature difference of 15oC.... more
Sustainable Energy Science Physics

10/14/14

#### Calculate the daily energy saving (in units of kWh)

You make a decision to reduce your daily shower time from 15 minutes to 5 minutes. For each shower the water is heated from 20oC to 50oC and an energy-saving shower head is used which limits the... more
Sustainable Energy Math Science Physics

10/14/14

#### how many years can this plant be operated?

A pilot geothermal plant is installed over a basin with an estimated stored heat energy capacity of 88 TJ. The geothermal plant has an average capacity of 230 kW. For how many years can this plant... more
Sustainable Energy Physics Water Energy

10/12/14

#### Which one is the correct answer for it?

A typical residential hot water system that uses approximately 10 kWh(e)/d is replaced with an electricity-boosted solar hot water system that uses an average of 170 watts (W) of electrical power.... more
Sustainable Energy Physics Energy Powers

10/12/14

How much power is required to cool a house to 22oC on a 40oC day if the "leakiness" (heat-loss coefficient) of the house is 3.6 kWh/d/oC? You may assume that the air-conditioner cooling the house... more
Sustainable Energy Physics Energy Heat

10/12/14

#### How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?

A thermal power plant produces 82 MWh/d of excess heat energy. How many homes could be heated from this source assuming heating requirements of 40 kWh/d per house?
Sustainable Energy Physics Energy Geothermal

10/12/14

#### For how many years can this plant be operated?

A pilot geothermal plant is installed over a basin with an estimated stored heat energy capacity of 88 TJ. The geothermal plant has an average capacity of 230 kW. For how many years can this plant... more
Sustainable Energy Physics

09/17/14

#### Sustainable Energy: True or False?

A tidal power plant has been proposed for construction in the Newcastle region of England, where extreme tidal ranges are observed. The proposed plant would produce 100 GWh of electricity per... more
Sustainable Energy Physics Energy Wave Theory

09/17/14

#### What is it’s capacity factor?

The Pelamis Sea Snake wave energy collector has a peak power output of 750 kW, and can produce 2600 MWh annually.
Sustainable Energy Physics Electricity Wind

09/17/14

#### A wind farm produces 1 GWh of electricity per week from 31 x 1MW wind turbines.

Calculate the capacity factor of the wind farm. Express your answer as a percentage.

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