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Heating and cooling: Ducted air to air heat pumps

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    • CommentAuthorowlman
    • CommentTimeSep 9th 2018
     
    Thanks Dave, I know lots of aircon installers use the pre-insulated stuff usually comes compressed in 10M boxes and hence handy. I guess however it's prone to sagging with all the airflow implications that implies, so I kind of discounted it, plus the insul. doesn't look the best to me.
    The semi- rigid is an option and although the spiral rigid can be cumbersome in an existing loft situation and requires accurate measurements, it's usually considered the best. I hadn't considered square.
    • CommentAuthorowlman
    • CommentTimeFeb 25th 2019 edited
     
    I've got most of my Air to Air system installed. The outdoor compressor is in situ on it's dedicated plinth/platform and the interconnecting cable and refrigerant pipework almost complete. Controller is in as are the supply and return ceiling grilles and plenums. All that remains now is to insert the "Indoor Unit" and the ducts that connect it to the supply and return plenums.
    The plenums were fabricated to accept a 300mm supply, and a 315mm return duct, but I'm having last minute doubts that the supply side may be slightly oversized and 250mm may be better for 2 x 4.5+M runs.
    Of all the interior work I've done over the years configuring a good ducted warm air system has been the most difficult. It seems to me to be a real black art.
    Pity there's no RHI
    • CommentAuthorowlman
    • CommentTimeAug 31st 2019
     
    I've finally completed my A2A heat pump install, and I'm now on my way with insulation, using foil faced ductwrap.
    The whole system performs incredibly well, and the response time is so quick. The compressor is so quiet and once indoor temp is reached and it begins to modulate you can hardly hear it, even standing nearby.
    My worries regarding duct sizing were unfounded and I'm unable to detect significant airflow from the ceiling registers which was my aim, and not a even a whisper of noise.
    Although the system was designed principally for heating, the first test was cooling, with amazing results.
    I'm now starting to monitor electricity usage and initial results seem as predicted, only a full heating season will tell.
    The whole design was intended to heat a large open plan area 70 M2 with high ceiling in one part but it appears on initial testing to be so efficient that I may well drill a 5-6" core through the thick internal wall that separated this area from the hall and install a small inline duct fan to circulate air.

    Thanks Paul in Montreal for your initial advice.
    • CommentAuthorGarethC
    • CommentTimeSep 2nd 2019
     
    Very interested to follow this thread. Very informative thanks. You confident of performance over winter?
    • CommentAuthorowlman
    • CommentTimeSep 2nd 2019
     
    The operating range for heating is -27C to +15C with a COP of 4.81 and an 7.7 Kw heating capacity.
    With well insulated smooth ducting I'm hoping things will be fine. I have two supply and two filtered extract registers, I've positioned one of the extract ones high up in the top of my sun-room so its pulling pre warmed air into the indoor unit inlet where the system stat is located. I'm hoping this setup will reduce the load on the outdoor unit further increasing efficiency and reducing power usage.
    Total energy usage will only be apparent after a winter heating season, but so far it doesn't seem to use much.
  6.  
    Posted By: owlmanThanks Paul in Montreal for your initial advice.


    My pleasure! I'm glad to hear that your system has exceeded your expectations! As you found, if properly designed and installed, there is no draft nor noise :)

    Paul in Montreal.

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