In the United States, coal is a fossil fuel , used mainly to fuel the energy nee
ID: 834724 • Letter: I
Question
In the United States, coal is a fossil fuel, used mainly to fuel the energy needed for electric power plants to manufacture electricity. The air pollution caused by burning coal has been linked to health problems and concerns for the general population. Mobile phones and portable electronic devices are rechargeable and mainly use lithium batteries as a power source. These devices must be regularly charged on a continuing basis, depending upon their frequency of use. They are often charged using the electricity generated from coal fired electric power plants. In this exercise, we will discuss the relationship between portable electronic device use, and the amount of mercury produced from burning coal to make the electricity associated with running these portable devices on a regular basis.
For your final group presentation as a group online assignment through Blackboard, you are to submit a 20 slide powerpoint presentation that includes the following things.
Explanation / Answer
Energy content of coal is given in terms of KiloJoules (kJ) per Kilogram (kg) of coal as the Gross calorific value (GCV) or the Higher Heating value (HHV) of coal. This value can vary from 10500 kJ/kg to 25000 kJ/kg depending on the quality and type of the coal.
The efficiency of power plants in Us varies from 33% - 42 %
One Kw is 3600 kJ/hr. If the energy conversion is 100 % efficient then to produce one unit of electricity we require 3600 kJ.
After considering the conversion efficiency in a power plant we require an heat input of (3600 / 33.44% ) 10765 kJ/ kw hr equals to .5 kg/kwh
A lithium-ion battery (sometimes Li-ion battery or LIB) is a member of a family of rechargeable battery types in which lithium ions move from the negative electrode to the positive electrode during discharge and back when charging.
Typical efficiency of charge/discharge of the battery is 80
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