Transportation

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Comparing Energy and Heat Units

Keywords: BTU, cost, energy, greenhouse gases, oil barrel, quad, R-value, thermal conductivity, thermal resistance, unit conversion, Watts

How do I compare heat and energy values given in different units?

A look at how to compare the costs of natural gas, gasoline and electricity and how to convert between various heat units including R-values, U-values, BTU/h, W and more.

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7 years 2 weeks ago

Solar Powered Airplanes

Keywords: airplanes, estimation, solar cells, solar energy

If we were to coat a Boeing 747 jumbo jet with solar panels, is it possible to fly it using only the energy generated by these solar panels?

This module introduces the concept of estimation, both in the sense of rounding extremely precise numbers off to remove excessive significant figures, and simplifying a complex process (the flight of a 747) to a simpler one, by evaluating the possibility of powering a 747 with solar panels.

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7 years 8 weeks ago

Energy Use in Cars 6: Gasoline Cars vs. Bicycles

Keywords: air resistance, bicycle, energy use in cars, fuel economy, rolling resistance, vehicle transportation

When does a car have the same fuel efficiency as a bicycle?

A comparison of the energy cost of transportation between cars and bicycles.

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7 years 8 weeks ago

Energy Use in Cars 5: Gasoline Cars vs. Electric Cars

Keywords: electric cars, energy use in cars, fuel economy, vehicle transportation

How do the greenhouse gas emissions of electric and gasoline cars compare?

A comparison of the energy cost and greenhouse gas emissions of gasoline and electric cars.

 

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7 years 8 weeks ago

Energy Use in Cars 4: Regenerative Braking Systems

Keywords: energy use in cars, fuel economy, regenerative braking, vehicle transportation

What single system could be added to a gasoline car to improve its city driving fuel economy by 30-40%?

A calculation of the fuel consumption due to stop-and-go driving, for the purposes of estimating potential savings from a regenerative braking system.

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7 years 8 weeks ago

Energy Use in Cars 3: Rolling Resistance

Keywords: energy use in cars, fuel economy, rolling resistance, vehicle transportation

Why does Natural Resources Canada recommend keeping your tires inflated to conserve gasoline?

A rough calculation of rolling resistance in cars explores the impact of having underinflated tires.

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7 years 8 weeks ago

Energy Use in Cars 2: Constant Speed Cruising

Keywords: air resistance, drag, efficiency, energy use in cars, fuel economy, vehicle transportation

If a body in motion tends to stay in motion, why do we need to burn gas to travel at highway speeds?

Why do we need to burn gas to keep travelling at the same speed? The basic answer is "because if we didn't, eventually the car would stop." In everyday life, there is always friction and air resistance that opposes any motion, and if you leave a moving object alone, this friction and drag will eventually cause it to stop. This lecture looks at how this drag impacts a car.

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7 years 9 weeks ago

Energy Use in Cars 1: Stop-and-Go Driving

Keywords: efficiency, energy use in cars, fuel economy, kinetic energy, vehicle transportation

When does cycling cost more in fuel than driving?

People recommend commuting by bicycle rather than by car to save energy. However sometimes when a cyclist pushes the button to make a traffic light change, it means that a bus full of people has to stop. When a cyclist makes the bus stop like this, is the extra fuel it has to burn to get back up to speed MORE than the fuel saved by choosing to commute by bicycle rather than car?

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7 years 9 weeks ago

Cycling and Showering

Keywords: cycling, energy use, heat capacity, showering

Are cycle commuters, who take an extra shower, doing more damage to the environment than those who commute by car?

A recent letter to the Vancouver Sun claimed that commuting by bicycle was worse for the environment than commuting by car. The reason given was that if a cycle-commuter takes an extra shower at work (because cycling makes you sweaty), that burns the energy equivalent of a litre of gasoline, which is more than a car would burn on an average commute. Fact or rubbish?

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7 years 9 weeks ago
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