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  1. #1
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    It's too damn hot - I need an air conditioner

    Got two, in the two biggest bedrooms, but our living room doesn't have one yet. It's getting too damn hot to watch the telly, a state of affairs up with which I am no longer prepared to put.

    So what size A/C Unit do I need?

    The room is about 4.5m by 4.5m = 20.25 sq m
    South facing main wall with glazed area (window and sliding aluminium framed doors) = 4.8 sq m
    West facing second wall with glazed area (windows) = 3.72 sq m
    Doubt very much there's any decent insulation to speak of
    4 low energy light bulbs and one circular fluorescent tube in the ceiling
    Ceiling height = 2.5m
    Other equipment includes Sony Home Theatre (six speakers) and 24" CRT TV (soon to be upgraded to a 32" flat screen TV?)
    2 occupants - one big boy (me) and one small woman (her)

    I'm thinking 10,000 - 12,000 BTU. Am I a long way off?
    The sleep of reason brings forth monsters.

  2. #2
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    Marmite the Dog's Avatar
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    12 to 15 is more like it.

  3. #3
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    I have a room about that size with the same; poor insulation, and my 12,500 BTU unit does a fine job.

  4. #4
    Thailand Expat Bobcock's Avatar
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    Depends what internal design temperature you would want to maintain?

    What is your external design tempewrature you wish to work to?

  5. #5
    Thailand Expat gusG's Avatar
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    Save yourself some money and put the TV in the bedroom.

  6. #6
    Thailand Expat Bobcock's Avatar
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    I would guestimate as such using a IDT of 21 and an EDT of 36 making a deltaT of 15

    UA(DT) is the formula

    8.52 x 15 x 5.6 = 715.7

    +

    (9 x 2.5 -8.52) x 1.8 x 15 = 377.46

    Infiltration gain = 0.33Vn DT

    = 0.33 x 5.1 x 1 x 15 = 250

    That covers your fabric heat gain = 1.35 KJ/s

    Plus you may need a ceiling gain, you didn't say.

    Allowing for the rest, two people at rest, a TV lights you are looking at getting up around 2KJ/s, I don't have my guides with me at the moment.

    Essentially that calc gives you around 7000 Btu/h.

    I'd say your 10000 is about right.

  7. #7
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    Dammin, beaten by bobcock !!!

  8. #8
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    Never do it with 10,000, waste of money to buy less than 13000, if you don't need it sometimes it will not run as much and you will be cool.
    with a 10,000 it will be balls to the wall all the time and you will still be hot.
    Air con is like Ice Cream or good pussy, you can have to little but never more than you want.
    We just had a new one put in the living room, a Mitsubishi Mr. Slim. and 13,000 and it is good, cools the room and then drops back and runs just enough to keep it cool and at the temp we set which is set at 30 C in Economy mode, and is just right, better than on full and gets cold then shuts off and gets warm again and back to full on. ME-SGE13VC at 20k baht. installed.....

  9. #9
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    Quote Originally Posted by benbaaa
    Got two, in the two biggest bedrooms, but our living room doesn't have one yet. It's getting too damn hot to watch the telly, a state of affairs up with which I am no longer prepared to put
    Quote Originally Posted by gusG
    Save yourself some money and put the TV in the bedroom
    The bedroom is the best place for a TV anyway

  10. #10
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    Quote Originally Posted by DrAndy
    The bedroom is the best place for a TV anyway
    Pobly right, unless you want to sleep, or if you are to old to fuck, then the bedroom is a very good place for the TV.
    Coarse if you need a porn vid to get it up and then do the doggie, I would highly reccommend the bedroom for a TV.

  11. #11
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    If you need to sleep, then it is possible to switch the TV off

    as for the rest, you either have a vivid imagination or no sex, or both

  12. #12
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    Thats cool, if you sleep alone in that bedroom or are an inconsiderate prick.

    But if there is more than one then , remember it is the BEDROOM, not the den.

  13. #13
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    12,000 should be more than ample, (cheaper to run 2 x 12,000 btu air-con than 1 x 24,000 unit!)

  14. #14
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    Quote Originally Posted by blackgang View Post
    Thats cool, if you sleep alone in that bedroom or are an inconsiderate prick.

    But if there is more than one then , remember it is the BEDROOM, not the den.

    It is possible that two people enjoy watching the same programmes; sharing is half the fun

    what is a "den"?

    as for BEDROOM, it is also possible that the ancient definition has changed nowadays.Whilst having a bed, they can also have a TV, a jacuzzi, a sofa, bookcases or whatever you want (fruit machine?)
    I have reported your post

  15. #15
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    It is always better to have too much power than too little. Go for 15,000 and your energy bill will be lower because the compressor does not have to work as hard to cool the room.

  16. #16
    Thailand Expat Bobcock's Avatar
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    Go on ignore the calcs put in a 100,000 Btu/h unit, or even a huge chiller on the roof.

    Get something big enough to actually stop you getting in the room? I mean it is only 4.5 x 4.5.

  17. #17
    Thailand Expat terry57's Avatar
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    Quote Originally Posted by benbaaa View Post

    So what size A/C Unit do I need?


    Other equipment includes Sony Home Theater (six speakers) and 24" CRT TV (soon to be upgraded to a 32" flat screen TV?)

    1. = Don't fok around , just buy a big bastard but make sure it has an inverter fitted as it will be much more efficient and save you a considerable amount of money on your power bill.

    2. = The money you save on electricity you can buy yourself a huge fok off 50 " television. Why fok around with a 32" ? There as gay as a butchers cock matey.

    Besides that lot, have a stupendous day.
    Stroller is a Yerman faggot.

  18. #18
    Thailand Expat terry57's Avatar
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    Quote Originally Posted by aging one View Post

    It is always better to have too much power than too little. Go for 15,000 and your energy bill will be lower because the compressor does not have to work as hard to cool the room.
    ^
    Spot foking on this man.

    Exactly what the inverter does.

    Buy this man an ice cream.

  19. #19
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    I have a TV in my bedroom too, but it's a bit cramped when we have friends or family visiting, everyone squashed up on the bed.

    Thanks to everyone - seems like I wasn't far off, but nearer to 12,000 than 10,000 BTU might be prudent. I'll probably check out something like blackgang's model - Mr Slim. I have to be honest, I thought that was a brand name for a dildo, but you live and learn.

    ---
    Edit - Oh, and thanks for taking the trouble Bobcock. I don't know what most of your post really means (IDT, EDT, infiltration gain, ceiling gain?), but you've confirmed my guess wasn't far off, and that's what I really wanted.

  20. #20
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    The newer Mitsubishi Mr. Slim models are excellent. Whisper silent and really effective. I have two older ones and two newer ones myself.

    I also have a "HI-CLASS" which is noisier and seems to deplete its refrigerant quicker (no surprise considering the name).

  21. #21
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    Just need an aircon for sleep
    Going to call the repair man and have them serviced
    getting damn hot at night

  22. #22
    Thailand Expat Bobcock's Avatar
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    benbaa, ceiling gain is asking whether you will gain heat through the ceiling. You gave us no information as to what is above the room.

    Tell me and I'll give you a final difinative calculation.

  23. #23
    Whopping Member
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    Roof space and ceramic roof tiles, like the ones in this pic, but brick red.


  24. #24
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    Actually, I can do better than a Googled search for roof tiles like mine. Here's my actual house. The room we're looking at is on the left. The side you can see with the door is south-facing and around the corner is west facing.


  25. #25
    Thailand Expat Bobcock's Avatar
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    Ok so you are looking at sort sort of fabric gain from above.

    A recalc allowing for that and some more accurate figures I looked up last night for such a TV and people I'd say 10,239 Btu/h.

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