Energy Conversion Processes is discuss here.Saving energy is one of the words you hear more and more. Unfortunately, many places you’ll hear it will contain ads for marketing products or lifestyle habits that may have nothing to do with actual energy savings. To learn what the actual energy saving techniques are, you must begin to understand the underlying theory of saving.
Understand energy savings
Energy saving is not about using limited resources for as long as possible. That would mean doing nothing more than prolonging a crisis until you run out of energy. Conservation is the process of reducing the demand for a limited supply and enabling the reconstruction of the supply. Often the best way to do this is to replace the energy consumed with an alternative.
For fossil fuels, conservation may also include finding new ways to access the land supply so that commonly use oil fields are not completely depleted. This allows these fields to be filled more. Process that doesn’t takes place overnight. When you talk about replenishing natural resources, you are talking about reducing the excessive demand for supply in 100 years so that nature can recover.
- A variety of energy conversion processes take place in nature.
- Humans can perform a series of addition processes using a variety of devices (or processes).
- Usually, the effect of a device creates more than one form of energy.
- Many devices perform various conversion processes
e.g. : power plant – Coal Fired Power Plant, Nuclear Power Plant
•First Law (Energy Conservation)
–Energy can neither be create or destroy
–Energy can be utilize, not consume
–The quality of a certain amount of energy, i. H. The amount of work or action you can perform decreases each time energy is consumed.
–We degrade or randomize energy
•Energy we use is degrade into heat and then radiated out into space
Engines – Energy Conversion Processes
•A consequence of the second law is that the perfect heat engine is impossible
Efficiency of ideal heat engine Efficiency e = 1 – T2/T1
Where T1 is the temperature of the heat source (hot gas produce by fuel combustion
Where T2 is the surrounding air temperature
For a car, T1 = 2400K, T2 = 300K
So (Theoretical Efficiency) = 1 – 300/2400
Calorific Value – Energy Conversion Processes
•The calories of thermal units contain in one unit of a substance and release when the substance is burned
What is the calorific value of the petrol = 10kWh/litre
Note density of the petrol assume to be 840kg/m3
Car Example – Energy Conversion Processes
What about the energy costs of making automobile fuel?
What about energy costs for auto manufacturing.