Have you ever wondered how your refrigerator works?
He refrigerator uses simple and interesting scientific principles.
Became an indispensable part of the family.
With the basic refrigerator model.
Explain in detail the operation of modern refrigerators.
Uncover the good energy conversion efficiency behind the refrigerator.
The basic refrigerator principle is very simple
Cooldown by continuously passing the cold medium inside the object
Let's take a look at how the refrigerant in the refrigerator flows
A simple device is called a refrigerant controller
Is the most important component of the refrigerator
The capillary tube is used as a channel in the refrigerant controller
The refrigerant flows by generating capillary phenomenon
To ensure more efficient flow
The refrigerator must ensure that the refrigerant at the entrance is at a high pressure
The refrigerant is injected into the pipeline
The pressure drops when the refrigerant flows
When the pressure drops, the boiling point of the refrigerant also drops
The drop in boiling point makes the refrigerant have enough energy to evaporate
So evaporation causes the temperature to drop
If you observe the temperature of the refrigerant controller
You will find this phenomenon
Please note that only this part of the refrigerant will evaporate
This is an important part of refrigerant flow
It should be able to change the pressure of the refrigerant at this stage at room temperature
The next stage is simple
Just let the refrigerant pass to cool the inside of the refrigerator
While absorbing heat
The refrigerant further evaporates and transforms into purer vapor
Heat exchange at this stage
Does not increase the temperature of the refrigerant
This heat exchange is called evaporation
Thanks to the use of the evaporator fan in the refrigerator
Manufactured air circulation
To maintain different levels of temperature
So we produce the desired cooling effect
If we can transform the low-pressure refrigerant back to its original state
That is to change back to a high-pressure liquid
We will repeat this process
So the first step is to increase the pressure
Compressors are used for this purpose
The compressor will increase the pressure to its initial pressure value
You can see here that reciprocating compressors are used
However, while the compression is in progress
The temperature rises with pressure
Is not allowed to happen
The state of the refrigerant is now a high-pressure gaseous state
In order to transform it into liquid
We will introduce another heat exchange device
This device is set outside the refrigerator
So as to release heat around it
The refrigerant will change from gas to liquid
The temperature will reach normal levels
This device is called a condenser
Now the refrigerant is back to its original state
So it can provide a refrigerant controller at one time
Just keep repeating this cycle
We will be able to achieve a continuous cooling effect
Furthermore, this cycle is called the vapor compression cycle
The performance of the refrigerator can be
Find the formula of "performance coefficient"
The formula is output (heat absorption) ÷ input (used power)
As shown in the figure, the performance details can be easily obtained by definition
This may have been the most basic refrigerator
This refrigerator can run smoothly in theory
But in practice, it will encounter many problems
Let's take a look at the problem and how to overcome it
The main problem is frost in the freezer
The air in the freezer contains water molecules
So when the air touches the evaporator plate
They will condense and frost around the evaporator plate
The surface of the frost will prevent the heat from being transferred out
The efficiency of the refrigerator will decrease over time
The smartest way is with the help of heating tubes
Regularly remove frost
This is why the bottom of your refrigerator
There will be a basin
In addition, in modern refrigerators
You won’t see the condenser plate behind your refrigerator
Replaced by a more compact design
A compact design can be achieved entirely with the help of a cooling fan
Here it also achieves the effect of isolating hot air And hot air can also be used during defrosting
Used to evaporate the water flowing down after defrosting
After the improvement, the refrigerator looks like this
The temperature distribution of the various parts of the refrigerator is shown in the figure, which is interesting
The schematic diagram of the temperature passing through the capillary is also more detailed here
You can see that there are two refrigerant pipes outside the refrigerator
One line brings the liquid refrigerant from the capillary to the evaporation tray (capillary)
The other one takes the gaseous refrigerant away from the evaporator (return pipe)
When you look at your own refrigerator, you can only see that there is only one line outside
Why is this so?
The most important part of the refrigerator is the capillary
The capillary needs a device, not like a spring
It can become a slender pipeline as shown
The temperature change graph of the new capillary is here
You only see one line because it’s all integrated into the trachea
This simple device played a big role
We know that when the refrigerant absorbs heat,
The temperature itself did not increase
Only when the temperature increases
This means that if we put the capillary in the return tube
Will make the temperature of the refrigerant in the capillary drop a lot
This effectively reduces the temperature inside the capillary
Created a further improvement in refrigerant efficiency.
On the other hand, the heat absorbed by the return pipe
It will ensure that the refrigerant vaporization in the return pipe is more successful
This is beneficial for compressors that are designed to compress the only gaseous refrigerant
The dew pipe is designed to remove moisture that affects the operation of the compressor
Now let’s take a look at what other innovations have changed into the refrigerator
"Digital Inverter Compressor"
The compressor is the heart of all-refrigerators
It also brings life to the entire refrigerator system
You may notice the compressor in the old refrigerator
Turn it on and off
This is called "single-speed operation"
When the internal temperature reaches its best state
The compressor will shut itself down
When the temperature exceeds a certain limit
The compressor will start on its own
So you will find that the internal temperature control is not very stable
In addition, sudden speed changes
Will adversely affect the durability of compressor components
Compressor with digital inverter
The speed of the compressor can be changed
Therefore, smooth and efficient temperature control of the evaporator is achieved
Here the controller converts AC power into DC power as power
The power and frequency provided by the controller
Accurately control the speed of the motor
Generally most of the motors using this technology
Called "DC Brushless Motor"
Digital inverter compressors are better than single-speed compressors
Reduced consumption by at least 40%Thank you!!!!!!!!
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