We were able to cool a space equivalent to 130 tatami mats using the electricity equivalent to XNUMX tatami mats!

We were able to cool a space equivalent to 130 tatami mats using the electricity equivalent to XNUMX tatami mats!
This morning I went to a Takarazuka site, visited a house in Senri, gave a lecture in Osaka, and had a meeting in Nishinomiya.
This was yet another very busy schedule.
Today, I visited a house in Senri to check the effectiveness of the air conditioning in the house that was delivered to me a few months ago.
The purpose was to measure and confirm the temperature.
The system was a huge house with a floor space of 65 tsubo (130 tatami mats).
This was a combination that we had little experience with in terms of both system and scale, so we needed to check it out.
By the way, this house has a Q value of 1.0.
The results showed that the average temperature in the house was 27°C and the absolute humidity was 13-14g, which was a comfortable level.
The condition is well maintained. There are some temperature differences between rooms, but the rooms are well ventilated with proper consideration for blocking out sunlight.
Although this is a design, the slight difference in the size of the windows on the east side still makes a difference.
I understand. No matter how much experience you have, thermal environments are complex.
Furthermore, I thought it would be even more ideal if the absolute humidity could be reduced by another gram.
I was also shown the electricity bills for the past few months, from July 15th to August 15th.
We were able to calculate the amount of electricity used for cooling during the hottest month of the year.
The entire building is air-conditioned 24 hours a day.
However, the result was that a space equivalent to 10.7 tatami mats was powered using the equivalent of XNUMX tatami mats (XNUMX tatami mats to be exact).
I found that it kept the temperature and humidity in the whole house at a comfortable level.
Calculating the capacity of an air conditioner is very difficult, but by working backwards from the results of this study, the following factors can be calculated:
If the air conditioner is properly shielded, it can be used with a capacity of 12/XNUMX the tatami mat size indicated in the catalog.
I understood that.
In terms of heating capacity, in the case of the general specifications of Matsuo Design Office, the capacity can be 6/XNUMX or less of the tatami mat number indicated.
However, judging from the results of this study, if the insulation, airtightness and sun protection are properly done,
Because heating has less margin than cooling (it's still 6 times larger!!)
If you calculate the capacity of your air conditioner based on heating, you will be absolutely fine during the cooling period.
I understood it clearly.
This kind of thing is not written in textbooks on self-reliant recycling or in national standards.
I designed it myself based on simulations, and investigated temperature, humidity, and electricity costs.
This is something that only humans can do. Moreover, the example in question is a house in Osaka Prefecture, the hottest place in Japan.
This was a huge harvest!!
However, this is a C value of 1 or less, and if using glass wool, it is equivalent to 180 mm or more at high-performance 16K.
The minimum requirements are a 0.3H or higher eave on the south side, and low-E and small windows on the east, west and north sides.
This is assuming all of these conditions are met. If any of these conditions are not met, the cooling load will be
This will increase significantly. Please take care not to make any mistakes.