08 Jun Question This set is intended to acquaint students with an un
Question
This set is intended to acquaint students with an understanding of how to convert units of energy in order to begin to solve problems that require an ability to compare the attributes of multiple energy sources.
You are an environmentalist who is interested in human health and welfare. One strategy that you’ve decided to employ to help promote personal and environmental well-being is to ride your bike to work. You live in a suburb of Chicago called Evanston. The year is 2005. You commute 13.1 miles each way to the Sears Tower each day. You weigh 145 lbs. You ride at an average rate of 15 MPH.
You are very proud of your contribution to curbing climate change and were talking loudly about it last night at a bar. Another patron overhead your conversation and chimed in to let you know that it would be better for global warming if you used an electric bike instead. He explained that when you consider the carbon impact of your diet and the calories you burn riding the bike each day and compare it to the carbon content of the electricity it takes to power the bike, you’d actually be better off using an electric bike. After leaving the bar, you decided to figure out whether that guy was right, or if he was just an obnoxious drunk. You did a little research and discovered:
A rider biking at 15 MPH burns 0.2 Cal per pound of body weight; to get Cal’s burned on a ride, simply use the following equation: (weight*distance*0.2 cal)1
The average American diet has a carbon emissions profile of 4.3 grams of CO2e per calorie2
There are 4,200 joules in a large calorie (food calorie), which is the amount of energy it takes to raise one kg of water 1° C
There are 3,600 joules in a watt hour of electricity
Each kWh of electricity you use from the local utility, Com Ed, has a carbon emissions profile of 0.664 kg per kWh . . . 3 In order to simplify the analysis, you decide to disregard the difference in embedded energy between an electric bike and a normal bike. Assume that both an electric bike and a human-powered bike use the same amount of energy to accomplish the work of commuting because they happen over the same terrain at the same rate. Given the information above, please answer the following:
Volume of emissions (expressed in kg per CO2e) attributable to human powered bike commute each way
Volume of emissions (expressed in kg per CO2e) attributable to electric bike commute each way
Volume of emissions of average American diet expressed in g of CO2e per watt hour
Volume of emissions of Com Ed electricity expressed g of CO2e per watt hour
Which has a lower carbon impact on the environment: the electricity used by the electric bike or the food calories you burn when biking?
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