The first in Japan!! A website that shows the objective energy-saving performance and warmth of housing manufacturers

Finally, Passive House Japan is the first in Japan to
It is possible to obtain insulation specifications from major housing manufacturers and major local construction companies.
Calculate the energy-saving performance (primary energy) and warmth (heating load) of the company
I made a table comparing the two, which can be found on the website below.
http://tatemono-nenpi.com/map/
Until now, the housing industry has been known to be "we are energy-efficient because we use this construction method."
"It's warm because of the external insulation."
"Solar power is the standard, so it's eco-friendly."
The performance was only discussed in vague terms such as these.
In the automotive industry
"It's a manual so it's fuel efficient."
"It's fast because it has a turbo."
However, I have not measured the ten-mode fuel consumption or the circuit lap time.
It was the same thing.
As a result, is it truly warm? Is it energy-efficient?
than
Does the catalogue seem energy efficient?
Does the salesperson's pitch really sound warm?
The housing industry in this country was in a poor situation where people had no choice but to judge things based on this.
This is despite the fact that they are 10 times more effective than cars and can be used for at least three times longer...
That's to be expected.
Even industry insiders do not know the primary energy and heating load values of their own buildings.
Of course, I didn't know that it could be calculated or that there were tools to do so.
As a result, what was happening in the industry was
-Consumers cannot make appropriate purchase decisions based on product performance.
・Even if we make products that perform well, the price is not evaluated fairly.
This leads to a tendency for cheaper products to win.
- Many homes are cold, leading to poor health and energy waste
・No energy saving
This vicious cycle continued.
This was done to break this vicious cycle.
This is a building health x energy conservation map.
The warmth index is expressed as the heating load, but whether it is warm or not
But that's not all. Recent research has shown that it's directly linked to your health.
It has become clear.
When it comes to energy conservation, it is becoming common to say that we should be patient, but
Building a small house will make it warmer and more energy efficient than ever before.
It will be possible to make it.
In this comparison, the standard specifications of each manufacturer are often used as a model by the government, 120.07 m2.
The calculations were done based on the actual house. Therefore, the comparison is based on the specifications only.
In the future, by collecting data on actual properties that have been designed, we will be able to make significant changes depending on the direction, location, design, etc.
We plan to make it possible to see changes in results.
First, we need to create an opportunity for the sales representatives of housing manufacturers to see this graph and to prevent them from making careless decisions.
I would like them to stop the bad practice of determining performance based on sales pitches.
I would also like to see a move towards a world of fair performance competition, like the fuel efficiency competition for cars.
However, collecting this data was difficult.
Because each company is very cunning.
While boasting about the insulation performance of their company on their website,
Type and thickness of insulation for walls, roof, and exterior walls, and whether or not there is heat exchange ventilation
This is because most companies leave important details such as sash insulation specifications blank.
This is the table I managed to collect under such circumstances. I didn't want the performance of each company to be compared fairly.
I couldn't help but wonder if that was the case.
This project started on a whim, but I hope that this graph will reach as many practitioners and consumers as possible.
By getting more attention and listing as many real properties as possible, we can help to give a legitimate role to the housing industry in this country.
I would like to create a flow for performance comparison.