quinta-feira, 3 de fevereiro de 2011

Rammed Earth in Panyaden School_Tailand


How Rammed Earth Buildings Can Save Energy

By Markus Roselieb

Rammed earth is ideal for hot and dry climates because of its great capacity to store heat. Therefore it is perfect for Chiang Mai during the dry season where we have hot days and cool nights. The heat gets absorbed by the rammed earth walls during the day and is released into the surroundings during the night. In this way, it balances out the temperature of the surrounding area.

In the case of a high moisture content in the environment, rammed earth is very suitable as it has good moisture absorption. The humidity content of the earth when it is dried out is very low. The earth can absorb up to 30 times more water than concrete which means that in the long and heavy rainy season, the rammed earth walls will absorb the moisture of the environment, and balance out the moisture content, providing a mold- and fungus-free space.

Comparing Thermal Performance

The table below compares the thermal performance of classrooms built with two different types of walls.

Source: Earth Architecture in Western China
Red curve = indoor temperature in a rammed earth classroom (like those in Panyaden)
Yellow curve = indoor temperature in a conventional brick and concrete-based classroom
Blue curve = outdoor temperature
It is obvious from the study above that the indoor temperature of the earth classroom is always stable. In summer, it swings only between 21oC and 24oC. In winter, without any energy consumption for heating, it can reach an acceptable indoor comfort.
If you touch earth, concrete, steel and asphalt that are exposed to the sun, you will find that the different materials have different temperatures. The metal will be by far the hottest, followed by asphalt, then concrete (both are still so hot that you cannot walk barefoot on them for more than a few minutes). The earth will, however, be cool.
A concrete building is like an oven in which an air-conditioned interior space is inevitable. On the other hand, rammed earth has an excellent thermal mass because of its high density, and the high specific heat capacity of the soils used in its construction. It can store the heat during the day and release it slowly into the surroundings during the night. This energy-saving feature is one reason why we built our classrooms with this technique.

Fonte: http://www.panyaden.org/blog/conserving-energy/

2 comentários:

Anónimo disse...

This one is an inspiration personally to uncover out way more associated to this subject. I have to confess your data extended my sentiments in addition to I'm going to right now take your feed to stay updated on every coming weblog posts you may possibly create. You are worthy of thanks for a job completely accomplished!
What i discover difficult is to discover a blog that can seize me for a minute however your weblog is different. Bravo.
My neighbor and I have been simply debating this particular topic, he is often searching for to show me incorrect. Your view on this is great and precisely how I really feel. I just now mailed him this website to show him your own view. After wanting over your website I e book marked and might be coming again to read your new posts!
Thanks for taking the time to discuss this, I feel strongly about it and love studying more on this topic. If potential, as you gain experience, would you thoughts updating your weblog with extra data? This can be very helpful for me.
I’m nonetheless studying from you, but I’m improving myself. I certainly love reading all the pieces that is written in your blog.Preserve the stories coming. I loved it!

Anónimo disse...

Visão prazeroza neste sítio, tópicos deste modo destacam aos que aparecer aqui :/
Realiza maior quantidade de este blog, a todos os teus utilizadores.