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  1. #11
    Join Date
    Jan 2012
    Location
    South Coast
    Posts
    5,040

    Default Re: Portable air conditioning unit

    The big problem with the self contained portables is the very air you are cooling is then drawn into the condenser section and ejected through the vent hose, meaning fresh uncooled air has to be drawn in, so a losing battle. If you can find one that has an umbilical with flexible fridge pipes in and a separate condenser that hangs outside is a better bet.
    Interested in Corvettes PM me for details of the Corvette Motorboat Association

  2. #12
    Join Date
    Nov 2015
    Location
    UK
    Posts
    2,010

    Default Re: Portable air conditioning unit

    Quote Originally Posted by Bouba View Post
    Unfortunately my experience with a portable air conditioner is that it’s not worth the trouble. I bought a fairly decent reasonably powerful domestic unit but it couldn’t lower the temperature of a small salon even by a small amount.
    They work very well if you read the instructions and use them properly...…… Did you use the duct and put the exhaust air to the outside ?
    Only ever look down on a person when you are bending over to help them up.

  3. #13
    Join Date
    Dec 2005
    Location
    Live London
    Posts
    3,512

    Default Re: Portable air conditioning unit

    https://marineairspares.com/

    And coastal rides example

    https://coastalrides.co.uk/dometic-e...onditioning%20

    And you will do this for less than a grand.

    It will work better and not need to be stored

  4. #14
    Join Date
    Sep 2016
    Location
    SoF
    Posts
    8,020

    Default Re: Portable air conditioning unit

    Quote Originally Posted by Bigplumbs View Post
    They work very well if you read the instructions and use them properly...…… Did you use the duct and put the exhaust air to the outside ?
    Of course!! I put the duct through a porthole it was a perfect fit and did not allow any outside air back in

  5. #15
    Join Date
    May 2001
    Location
    ation, Loc: ation, Loc: ation.
    Posts
    15,700

    Default Re: Portable air conditioning unit

    Quote Originally Posted by jrudge View Post
    https://marineairspares.com/

    And coastal rides example

    https://coastalrides.co.uk/dometic-e...onditioning%20

    And you will do this for less than a grand.

    It will work better and not need to be stored
    It's the way to go but you still need a pump, controller, ducting, grills, hoses, seacocks, etc. Plus labour. Think £2500 all in.

  6. #16
    Join Date
    Nov 2005
    Location
    Sant Carles de la Ràpita
    Posts
    6,834

    Default Re: Portable air conditioning unit

    In a previous life, many years ago, I was trained as an environmental engineer.
    That means heating, ventilating and air conditioning.
    With air conditioning, many people don't realise that you need sufficient power to handle two components.
    In an air conditioning environment, there is sensible heat removal and latent heat removal required to lower the temperature.
    The latent heat (removal of water) is a significant element and the temperature simply won't drop unless you can get the water (vapour) out of the environment that you are trying to cool.
    Have a look at a psychrometric chart and you will see how latent and sensible heat are linked.

    So, using these cheap domestic units - not only do you need to ensure that the exhaust air gets to outside but, because they are relatively low power, you should also seal the cabin to block any water vapour from entering the cabin. Something quite difficult in a marine environment.
    IMO, the reason that a proper marine air conditioning unit works better than a domestic one is that the marine units are significantly more powerful.

    BTW
    Have you noticed that it takes a few days for any boat's air conditioning system to become fully effective after a long period of no use. This is because it takes time for water vapour and dampness to be taken out of the fabric of the boat (cushions, curtains, and below decks in the bilges).
    Last edited by Hurricane; 14-05-19 at 08:17.

  7. #17
    Join Date
    Jul 2016
    Location
    Dover
    Posts
    398

    Default Re: Portable air conditioning unit

    I’ve been keeping my eye on this which looks interesting but would seem not available from uk yet

    https://doesitreallywork.org/zero-br...tioner-review/

  8. #18
    Join Date
    Sep 2016
    Location
    SoF
    Posts
    8,020

    Default Re: Portable air conditioning unit

    Quote Originally Posted by Dazzajohm View Post
    I’ve been keeping my eye on this which looks interesting but would seem not available from uk yet

    https://doesitreallywork.org/zero-br...tioner-review/
    Those little cubes which you see advertised everywhere do work. They are good for putting in front of a dog’s snout when they overheat.
    Neither a Leaver or Remainer be

  9. #19
    Join Date
    Jan 2006
    Posts
    5,081

    Default Re: Portable air conditioning unit

    If you have mains power (or a generator) you could try one of these;
    https://www.amazon.co.uk/Euromac-AC2...37458215&psc=1

  10. #20
    Join Date
    Nov 2005
    Location
    Sant Carles de la Ràpita
    Posts
    6,834

    Default Re: Portable air conditioning unit

    Quote Originally Posted by Pinnacle View Post
    If you have mains power (or a generator) you could try one of these;
    https://www.amazon.co.uk/Euromac-AC2...37458215&psc=1
    OK, P,
    Lets look at this more technically.
    But, rather than, getting into heat gain calcs, we can stick to some rules of thumb.
    A good way to get a simple idea would be to use a cubic measurement and multiply by a factor.
    After proper heat gain calcs, it seems that most systems come out as follows:-
    Main living spaces during the day seem to come out at around 16 to 19 BTUs/hr per cubic foot.
    And cabins used mainly at night would come out at around 10 to 12 BTUs/hr per cubic foot.

    The OP doesn't say what size his saloon is so lets assume (say) 12 feet by 8 feet by 7 feet high.
    That is 672 cubic feet.
    Multiply that by (say) 18 BTUs/hr per cubic foot and you need an air conditioning unit capable of about 12,000 BTU's per hour.

    The unit in your link above is only capable of one quarter of that at 2,400 BTUs/hr.

    So, going back to my post above, the unit in your link above would be a complete waste of time for a saloon of 12 feet by 8 feet by 7 feet.
    It is all about power.

    I guess that you could work back from 2400 BTU's/hr and see how small the cabin would be but remember we are talking a marine environment where there is a lot of water (vapour/dampness) about and that latent component is very high.

    Just my comments.
    IMHO it isn't worth wasting money on something that just isn't going to do the job - not even close.

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