# WHAT IS PRODUCTIVITY? HOW TO CALCULATE IT? (2)

In our previous article, we defined productivity by demonstrating modeling the energy conversion system with one energy input and one energy output.

(see WHAT IS PRODUCTİVİTY? (1)

Figure 1: General representation of Energy transformation system

In the same article ,we agreed about  P= (Output energy  / Input energy) x100 for an easy understanding of productivity.

At the end of the article, we wrote that we will criticize this demonstration and redefine productivity with a new system demonstration.

In the representation in Figure 1, 1 energy enters the system and 1 energy exits.

According to the law telling that The existing energy cannot be distroyed and the one telling that it cannot be created from nothing and according to

‘Conservation Principle of Energy’ entered energies are equal to the emitted ones in a closed system.

According to this system demonstration; Input energy = Output energy Productivity; Productivity = 100%.

In the universe There is no such system , the PERFECT (lossless) system.

So, we can easily say that this system representation is wrong and does not fully explain the productivity.

Now we give the new system demonstration as shown on figure 2.

Figure 2: General representation of Energy transformation system

Input energy(2)      Output energy(2)

Input energy(N)      Output energy(N)

Form2: General presentation of energy transformation system

Again, according to the ‘Principle of Conservation of Energy’, the sum of the energies Output = the sum of the energies Input.

Let’s express it by the formula;

Input energy (n ) =   Output energy (n)

Formula 1: Energy conservation concept

It is a very useful demonstration for understanding the subject we explained in Figure 2. Let’s make a few inferences;

1- For an energy transformation there must be at least one type of “Input energy” .

2- At least two types of energy appear.

3- Productivity is calculated from the target output energy.

In Figure 2, if the aim (target) energy is “output energy 1”;

PRODUCTIVITY = Is (Released energy 1 /  Entered energy (n)) x100

If the “Input  energy” is also one type;

PRODUCTIVITY = is (output energy 1 / input energy 1 ) x 100.

Now again let’s turn back to the lamp example like as in our previous article.

Figure3:  Electric to light energy transformation system(Lamp)

As can be seen here, electrical energy enters the lamp and (only) light energy comes out.

If only electrical energy was input and again only light energy  was output

We would have to say that productivity is 100%. No such lamp has been invented yet.

Let’s draw the correct representation of the lamp system example;

Figure 4: Electric to light energy transformation system(Lamp) and Heat loss energy

Let’s adapt the inferences we made in Figure 2 to our example;

1-Electricity is the lamp entring energy.

2-At least two types of energy are released from the lamp (Light and Heat).

3-We calculate the lamp productivity using light energy because we do not expect heat from the lamp and heat energy is a loss for us.

4- Productivity is calculated from the target output energy so light energy.

Productivity in a system; We have proved our thesis clearly above “The short definition of the output energy / input energy x 100 is a confusing definition”.

The correct definition of productivity is the ratio of the target energy to the input energy (s) multiplied by 100 .

The concept of productivity is the core of engineering. We will continue our articles about productivity.

Hope for the family, love, friendship and business investments you have made to be efficient,for now goodbye.

Hulisi AYLUÇTARHAN