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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorowlman
    • CommentTimeDec 28th 2020
    I asked this question a couple of years ago to no avail, but the situation has raised its head again, can anyone help?

    ( On an A2W system How is the heat transfer, ( refrigerant to water ) effected, and where does it happen e.g. at or near the compressor end, or in some dedicated specially designed indoor thermal store, with a refrigerant link between the two. )

    I'm pretty sure that with the Mitsubishi Ecodan for instance, everything happens in the heat-pump outdoor unit box. presumably with the link to inside the home,- UFH, CH or HW cylinder occurring via hot water pipework.
    Does anyone know of a manufacturer that does the heat transfer in a remotely sited heat exchanger. My reasoning is that on a long run, highly insulated refrigerant microbore pipes, outdoor unit to an indoor heat exchanger, may be easier to install than water pipework.
    • CommentAuthorjfb
    • CommentTimeDec 28th 2020
    Not an expert but I think any monobloc ASHP (like ecodan) does it all in the outside machine. Split ASHP has refrigerant pipes between outside and inside unit.

    I don't see why it should be any easier to install the latter (seems easier to me).
    Also consider that there could be more noise if it is a split system.
    If you had the refrigerant to water heat exchanger inside, it would be complicated to charge the heatpump with the right amount of refrigerant, as you'd have to know how long the refrigerant lines would be. For a manufacturer, it's simpler to keep the refrigerant circuit to a fixed size and then you're free to have the water lines as long as you like without affecting the compressor circuit.

    Paul in Montreal.
    • CommentAuthorowlman
    • CommentTimeDec 28th 2020 edited
    That may be true Paul but with an A2A system you also don't know how long the refrigerant pipework is, that charging is left to the aircon engineer and his box of tricks. The compressor bit and its associated pipework is the same A2A or A2W AFAIK.
    I suspect that the monobloc Ecodan system may have a lot to do with trying to simplify the system to allow plumbers, with a bit of training, to do it, thereby removing the need for aircon engineers.

    Edit: Actually after a bit of searching I found this. I'll investigate.

    The generation 6 Samsung EHSs can either be run as a monobloc (exchange to water outside) or as a split unit (refrigerant circulates to another internal unit). Former is easier, latter is more efficient.
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