Air conditioners are ultra-high performance energy-saving devices, but they are full of black boxes (2)

Air conditioners are ultra-high performance energy-saving devices, but they are full of black boxes (2)
Continuing from the previous session.
Generally, the following table is most commonly used for the distribution of heating COP.
This is also included in textbooks on self-sustaining, circular housing.

It's a three-dimensional graph, so it's difficult to read, but according to this table:
The most efficient operation is achieved when the load factor is around 70-80%.
However, another paper suggests that the most efficient ratio is around 40-60%.
Which one is true? Or are they both wrong?
That's not even clear.
Next is cooling.

There doesn't seem to be as much difference of opinion about cooling as there is about heating, and generally speaking, a load factor of 100% is the most efficient.
Therefore, it seems that it is fine to decide on the cooling capacity based on the rated capacity.
Now, let me explain what I perceive as the biggest contradiction.
The most obvious one is the maximum heating capacity.
There are supposed to be 11 different models, each with different air conditioner capacities.
However, when looking at the maximum heating capacity, it can be roughly divided into
You can see that there are only three types: 6.2KW, 7.7KW, and 11.3KW.
First of all, the maximum heating capacity of an air conditioner for a 6-tatami room is 6.1KW.
This is equivalent to the rated heating capacity of an air conditioner for a 16-tatami room.
I think you will be able to experience the wide range of air conditioner capabilities.
If we take a twisted side here, the air conditioner for a 14-tatami room and the air conditioner for a 26-tatami room will both be
You will notice that the maximum heating capacity is almost the same at 11.2KW and 11.3KW respectively.
In addition, the ratio of the rated heating capacity to the maximum heating capacity of each air conditioner is 45% and 84%.
The ratio is completely different.
From these facts, it can be inferred that this model "has 11 types of abilities, but in reality
We only make roughly three different models. However, for each machine, we make the most efficient one.
I think it is reasonable to think that the location is finely tuned.
I think this adds great persuasive power to the tuning theory.
In this situation, the percentage of the load factor that was initially displayed as the most efficient is no longer very meaningful.
I think it will become less efficient. For a 14 tatami room model, around 60% efficiency may be good.
For a 26 tatami room, 100% would be best. (These are approximate figures.)
However, in most cases, these tables are based on a 14-tatami room.
If you use it as a base, you may be able to trust it.
It is important to note here that the above discussion has been about heating, and cooling is obviously at maximum capacity.
There is a difference. Make no mistake.
Also, going back to the heating base.
The list price of this model and the price on price.com are listed.
This shows that the lowest price is approximately 30% of the list price.
The actual lowest prices range from 107,000 yen for a 6-tatami room to 277,000 yen for a 26-tatami room.
However, if we consider it based on heating capacity, it is the lowest capacity among the three major categories.
It is safe to say that there is absolutely no need to buy anything other than 6-tatami, 10-tatami, or 14-tatami mat sizes.
I think so. By the way, the model with the largest price difference among the large categories is the 14 tatami mat model.
The model for a 26-tatami room costs 135,000 yen, almost double the price difference.
As you all know, even though their capacities differ, the indoor and outdoor units are the same size.
The price difference is due to the small internal parts and the amount of refrigerant gas.
It seems.
To summarise,
The 6-tatami, 10-tatami, and 14-tatami (200V) models are a bargain for the buyer, but the manufacturer has a small profit margin.
The 8-tatami, 14-tatami (100V), and 26-tatami mat models are a loss for the buyer, but a profit for the manufacturer.
You can guess that.
Among them, the best in terms of efficiency, cost-effectiveness, and maximum heating capacity is
This is a 200V model for a room of 14 tatami mats. Of course, the optimal value may differ depending on the product.
Looking at most catalogs, it is clear that this is the main product number.
参考にしていただければと思います。
As mentioned in the previous blog post, this time I am only talking about the device that can be removed from the air conditioner.
This is based on heat quantity. In a house with poor insulation and airtightness, even if the calculated heat quantity is generated,
The hot air only goes up, and there are other problems such as it escaping from the top, so you won't get a satisfactory result.
That's why it's important to build a home with affordable, energy-efficient air conditioning that works exactly as expected!
I think this is the minimum requirement for building a house from now on.