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  1. #1
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    Cooling a house in Thailand

    I kept hearing the water run next door. What the hell is going on? I began to snoop and this is what I found.



    It seems as though some people will install these water sprinklers upon their roofs in order to cool down the house.



    The elderly couple that lives next door to us can not afford to run the AC all day. Hence, they try this cooling the roof method. Does it work?



    I tried to explain as best I could about evaporation and such, but ended up walking away and smiling.

    Am, I missing something here?

  2. #2
    Rhubarb, rhubarb, rhubarb
    Sir Burr's Avatar
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    It might cool down the tiles, but, would the air in the roof cool down sufficiently as well?
    Best to go with those round, wind driven extraction fans, I would think.

  3. #3
    Have you got any cheese Thetyim's Avatar
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    I had that in a house I used to rent.
    Helped a bit but not much.

  4. #4
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    i recall sitting outside under the carport of a mates place in Aus, and he had installed sprinklers on the carport roof, so that a fine wall of water surrounded us....

    kept us cool, but what a waste of water!

  5. #5
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    Thai spinning whirly roof vent thingys.


  6. #6
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    Are the Thai vents worth the installation?

  7. #7
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    Only take 10 minutes to install and it's included in the price, if your roof area isn't vented enough then it is worth installing.

  8. #8
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    I would think the water sprinkler would only work on a metal roof as the metal would conduct the heat... on a normal roof the tiles are there to insulate and so they will stop any effect from the water.

    Well, I've only ever seen it on a metal roof anyway, so there's my theory... somebody else will probably tell me I'm completely wrong

  9. #9
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    Go up into your loft tomorrow lunchtime and then tell us how good roof tiles insulate a loft

  10. #10
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    Heres one on my roof, got them on both single story and upstairs roof, seems to work some.



    But the sprinklers do some good as they will cool the roof and the attic temp. and better if you can catch the water in the gutters and recirculate it, we would have to as we have no well and use roof rain water for all household water.

  11. #11
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    that sombitch didn't work again,,,,

  12. #12
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    I've often wondered why Thais haven't caught on to attic or whole house fans. This is how folks back in pre-air conditioning days cooled their houses where I'm from (South Central Texas). Big ole blades mounted up in the attic creating a nice cooling breeze all year round. I lived in an old house in Austin with one installed and I can it works! The sound is quite nice as well. BTW, Texas is as hot and humid or maybe even hotter than Thailand for at least 10 months outta the year.

    From An Attic Fan and Whole House Fan Can Save You Money on Cooling

    Many people use whole house fans as an alternative to air-conditioning. A whole house fan is most effective when outside air temperatures are below 82F. It brings a cooling breeze in through the windows of the home and cools more efficiently than an air-conditioner.
    A whole house fan only uses about of the power that a central air-conditioning system does. Some people just dont like air conditioning or may want the option of using outside air for cooling and ventilating their homes. Whole house fans draw massive amounts of air through a home. Moving air feels cooler than still air so high volumes of air are usually preferred.

  13. #13
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    It never made sense to install AC in the SF Bay area, there were only couple of weeks in the year where it was really that hot. Putting a sprinkler on the roof during those rare heat waves would always cool the house down nicely! However, evaporative cooling is only really effective in dry climates. In a humid climate like Thailand's it's a lot less efficient.

  14. #14
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    Quote Originally Posted by dirtydog
    Go up into your loft tomorrow lunchtime and then tell us how good roof tiles insulate a loft
    Exactly, the loft will be hot, the water would cool the temperature in the loft a bit, but what effect would that have downstairs in a 2 storey house???

    (BTW, I don't live in the loft)

  15. #15
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    Quote Originally Posted by dirtydog View Post
    Thai spinning whirly roof vent thingys.



    I wanted to know what these things were called, now i know thanks DD

  16. #16
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    ^ 55 Those Thai spinning whirly roof vent thingys are at most 7-11s, so they must work, but then they have the air-con set to Arctic temperatures, too.

  17. #17
    Member corvettelover's Avatar
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    I had them in a house in north queensland turbine ventilators (whirley thingeys) worked beautifully.
    Also had the sprinklers mounted on roof and gutters back into rain tanks with sand boxes filtering water back in.
    worked like a dream.
    When the roof gets hot from sun it radiates heat down into roof cavity up to 60.C. Ask anyone that has had to crawl in a roof cavity even on a cool day
    Either tiles or tin mind you the tin you can fry an egg on .
    mechanical ventilators allow heat to escape out.
    i have seen baby solar panels powering small fans in the wirley things as well
    see link on these
    Maestro Solar Powered Ventilator 300mm, Motorised Roof Vent - CSR Edmonds

    the main link might give you a few ideas
    Consumer & Industrial Turbine Ventilation, Roof Ventilation, Roof Ventilators, Whirlybirds - CSR Edmonds
    I have mentioned this on a few threads before about the sprinklers on the roof first time i have seen pics with it on a thai house.

  18. #18
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    If I was to build a house in a hot climate I would seriously consider incorporating an underground cooling system. Basically it is a lineal concrete ducting system that draws cool ground temp - around 55 degrees - into the floor area of the house which then circulates upward to exit the roof via an exhaust fan during peak heat periods and automatic roof vents at other times.

    President Bush is reported to have just such a sytem at his Crawford 'ranch.'

    The main problem needing to be addressed is the air quality - over time the piping will tend to accumulate mildew. Air filters at the intake point should prevent any serious problems.

  19. #19
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    Quote Originally Posted by kerux
    President Bush is reported to have just such a sytem at his Crawford 'ranch.'
    Ok, that's one system less to consider then..

  20. #20
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    Quote Originally Posted by dirtydog
    Only take 10 minutes to install and it's included in the price, if your roof area isn't vented enough then it is worth installing.
    They are actually called turbine vents.

    I want to put one in my new house but for two things:

    - The are a bit ugly

    - I'm worried the installation will be of the same quality as other work done here and that a horrible leak will be the most noticeable result

  21. #21
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    Quote Originally Posted by Bexar County Stud View Post
    I've often wondered why Thais haven't caught on to attic or whole house fans. This is how folks back in pre-air conditioning days cooled their houses where I'm from (South Central Texas). Big ole blades mounted up in the attic creating a nice cooling breeze all year round. I lived in an old house in Austin with one installed and I can it works! The sound is quite nice as well. BTW, Texas is as hot and humid or maybe even hotter than Thailand for at least 10 months outta the year.

    From An Attic Fan and Whole House Fan Can Save You Money on Cooling


    Many people use whole house fans as an alternative to air-conditioning. A whole house fan is most effective when outside air temperatures are below 82F. It brings a cooling breeze in through the windows of the home and cools more efficiently than an air-conditioner.

    A whole house fan only uses about of the power that a central air-conditioning system does. Some people just dont like air conditioning or may want the option of using outside air for cooling and ventilating their homes. Whole house fans draw massive amounts of air through a home. Moving air feels cooler than still air so high volumes of air are usually preferred.

    Yes, this is the way to do it. The attic fan works great even when the air is hot. The moving air helps keep parts of the house cool that would get hot without the moving air, for example the ceiling, some wall areas, etc. One important thing to mention is - you must have adequate openings for the air to go out in the roof. In St. Louis, Mo. area, USA I had a house without adequate openings, but, I had an attic fan. The fan only cooled some. Then I added two of those spinning vents that dirty dog has shown here. My home became almost airconditioned.

  22. #22
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    ^I like the look of this idea, is there any company that does it or any shop which sells the fans in Thailand???

  23. #23
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    Quote Originally Posted by NickA View Post
    ^I like the look of this idea, is there any company that does it or any shop which sells the fans in Thailand???

    I am looking for the same now or at least an attic fan. The wind turbins you can get anywhere. I will post here if I find out information. I am in the final stage of building my home and need an attic fan and maybe one or two wind turbins.

  24. #24
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    I read about a system once, I believe it was in the seventies, where a water system was installed on the roof of a house in New Mexico, USA. I don't remember the link or the book, so, sorry I cannot provide any link.

    Basicaly, all I can remember is, it was a flat roof designed to hold a shallow amount of water about 4 to 6 inches deep on the roof. The water absorbed the heat and as the water was circulated thru a tank in ground where it was cooled. I never followed up on this because I thought that the system might waste too much water.

  25. #25
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    cool!

    anyway, we don't have an attic, just a room up to the tiles

    it is kept cool by vents at each end, which works well if there is wind. It may be worth fitting a fan on one end if felt necessary

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