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Energy Saving: To save energy no matter in what condition

Energy Conservation: Using Energy Economically

Energy Efficiency: Get the best energy out of the energy source.

High-Quality Energy: Intense, concentrated, and high-temperature energy that is considered high-quality because of its usefulness in carrying out work

Low Quality Energy: Dispersed energy, such as the heat stored in the oceans, with little capacity to perform useful tasks.

energy efficiency is

; when ever you transform from 1 type of energy to another, you will lose energy to chaos in the universe (nick named entropy). You will also lose some energy to forms that you did not intend. Burning 100 units of fuel in a burner will only transfer 75 BTU's of heat to water, some energy is sent out as light, and some goes to heating the air and lastly the molecules adsorb some energy in the form of entropy.

High quality come from the law that energy can only go from a hot source to a cold source. This means that you can't take water at 35 F and turn it to ice by blowing air at 100 F thinking that the air will warm up to 110 F and the water going to 32 F. A High quality energy source is very hot as compared to the average surrounding temperature.

True energy efficiency is a dream, due to the law of energy transfer and the paradox of perpetual energy. For instance; in order for something to be truly efficient it means nothing goes to waste. Gasoline is a potent source of energy per molecule, but is never fully realized, that is why catalytic converters are standard on all cars (the converters takes unburned gas and/or fumes and burns them off to release carbon). Perpetual energy is the idea that a systems output is equal that of its input, thusly creating an infinite energy source. The problem with this is that once you introduce a new component to the system, such as a light bulb, the systems output becomes less than its input, and inevitably fails. This is because the light bulb takes energy from the system and converts it into a new form, which is heat and that heat releases the energy, rather than cycling it back into the system. So perpetual systems are really only fun to ogle, but nowhere near realizable. On the other hand, we as humans could utilize what seems to us to be infinite energy, such as wind, geothermal, hydro, or solar. Our minds could not fathom any of these natural resources going to waste, because without them there would be no “us”. Humans have a tendency to avoid deathly apocalyptic scenarios. Even though the aforementioned modes of energy are finite, they are not likely feasible to disappear for millions of years, which one could justify them to be infinite. Take a windmill for instance; it has to be produced, which takes energy, and once utilized it converts wind energy into mechanical energy into electrical energy, not quite a perpetual system, but efficient nonetheless. The energy output of this system will eventually exceed the input of production, and that is where the efficiency comes into play. Take this scenario to understand gasoline’s potential versus its actual output; a company of ten employees has an output of 15% above the cost of running the company, paycheck, etc. This is nowhere near efficient, but enough to get by on. The output could realize 75% above cost, which is a quarter shy of true efficiency, but the employees are wasting time texting, blogging, laziness, etc. The employees are much more capable, but nothing about the job is enough to unlock that potential. Same with gas, nothing in our technological repertoire is capable of unlocking its true potential, and any energy source for that matter. Efficiency is the maximum realization of output versus input. BTW, I do believe the driving force of the universe is perpetual and 100% efficient.

Energy efficiency can be expressed in terms of energy used per unit of result desired. Desired is the operative word,

If I run an electric heater heating water, depending on my rate of eating and heat loss, my water may get hotter, colder, or remain constant despite the amount of energy expended.

So if I desire to increase temperature my efficiency is expressed in terms of kWh of positive increase in temperature / kWh of metered electricity.

We know that at some temperature, heat loss will equal input energy so that we would come to a zero efficiency based on our desired outcome. If we were willing to accept conversion of water to steam as part of our desired outcome we could have a much higher energy efficiency.

Two cars that use a great deal different amount of energy to propel them may each have an engine that is about the same degree of efficiency if we measure efficiency in terms of kWh output per litre of fuel used, but if we measure the cars distance travelled as the desired outcome, the car that uses less energy to propel it will be more efficient even though they each have the same efficiency in terms of engine power output.

Quality of energy: My house is heated with solar thermal energy, which does its job, but does not readily convert into energy that can light my home, power my refrigerator, or run an air conditioner. It is low quality energy because as I capture it it is not able to do a lot of things I want.

If I used a concentrating collector, I could have steam power, fairly readily usable for other transformations. I do not have to do a lot of transformation and loss of energy to get it to do anything I want.

If I go to Photovoltaic panels the energy output is extremely easily used for most industrial purposes. We call that very high quality energy.

But we can use even moderately low quality energy to do almost any task if we have a means of concentrating it.

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