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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.

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    I need to invest in some dehumidifiers to be left in customers properties

    Any recommendations on kit?
    I need a desiccant for this job
    • CommentTimeJun 17th 2020
    You mean dessicant type rather than compressor type - absolutely - compressor-type efficiency figures are measured in hot saturated tropics climate, perform far worse in temperate climate. Dessicant type do better in temperate.
    I heard Dri-eaze are a better make?

    Must be commercial grade
    • CommentAuthorSprocket
    • CommentTimeJun 18th 2020
    We've used several of the EcoAir DD322 Classic and really like them.
    It's a dessicant (Zeolite wheel) dehumidifier.
    Very quiet. Has an optional 2/4/8hr timer built in. Can sweep the airflow too. Works well even down to freezing temps. Dries laundry really well too.
    Can you run a longer pipe off those dd322 units for the pump? Like say to a sink for instance?
    • CommentAuthorLF
    • CommentTimeJun 18th 2020
    I have EcoAir classic too, it is not commercial (super robust) grade though. We like it too for winter washing drying and drying out bathroom.

    In an unheated cold house they will work better than fridge / compressor version but for normal lived (warm) dwelling not sure they are best option as power is higher. It works for us because of the drying laundry.

    It has simpler controls than some of other versions which I think is more robust, as that is the controls that failed on previous one (2 years old). You have to clean filter every couple of weeks - might not get done by tenants and may result in problems with the unit. They can be plumbed in. They are compact and easy to find a spot for.

    Most of electricity that goes in is kicked out as warm air - so it helps dry washing in winter.
    We do not have timer but we use a smart plug to do the same thing. It monitors the electricity used by it too.
    Waste heat is kicked out into room. It has laundry max drying setting which puts it on maximum.
    • CommentAuthorBeau
    • CommentTimeJun 18th 2020
    Posted By: fostertomYou mean dessicant type rather than compressor type - absolutely - compressor-type efficiency figures are measured in hot saturated tropics climate, perform far worse in temperate climate. Dessicant type do better in temperate.

    Having used both types the dessicant type were more efficient at low temp but once over 15C (IIRC) the compresor type was more efficient ie litres removed per kWh used. That was a Meaco V an old Ebac.
    • CommentAuthorCliff Pope
    • CommentTimeJun 18th 2020
    My experience is opposite to others', it seems.
    I bought a desiccant (sic) model because it was small and cheap, and I thought would be perfect in a damp bathroom. Left on all day it managed to extract about half a cupfull. The compressor kind can fill its container in a matter of hours if need be.
    • CommentTimeJun 18th 2020
    AIUI the key factor is not temperature but RH - at v high (near saturated, tropical) starting RH, the compressor does best at reducing air RH; but at more temperate air RH, the compressor type is much less efficient at drying stuff out, than the dessicant.
    • CommentAuthorrevor
    • CommentTimeJun 18th 2020
    One learns something every day. Did not know of the existence of these units although I once worked in a factory that used silica gel to dry process air. It was pretty big thing with what I seem to remember had 4 trays full of the desiccant and it rotated between drying the process air and being regenerated. Anyway I digress. I have used a compressor type (EBAC) in my house (s) for about 35 yrs and has been faultless apart from replacing the air filter. I now have it in my woodworking workshop. I checked the power consumption of the ECO air on line and was surprised it was about 30% higher than my old EBAC. So thought of switching gone out of the window.
    The one I will be using is a Corroventa on hire, I'll look into purchasing a decent bit of kit if I get a few more jobs in
    • CommentAuthorSprocket
    • CommentTimeJun 19th 2020
    Yes, the DD322 has a capped hose-connection in the water tray.
    Does anyone have thoughts on commercial grade units? Already been sent another two drying jobs and Ideally I'd like to have my own kit rather than renting.

    If you are renting kit then take the lead from the hire shops because they will want kit that stands up to hard usage and don't want kit that dies 1 week out of guarantee.

    If you like the performance of the kit you are renting then buy one.
    • CommentAuthorJeff B
    • CommentTimeJun 30th 2020
    We have an EBAC unit too. Only a few years old (not 35!) but working fine. It is mainly used to dry clothes on the landing (much cheaper to run than the tumble drier) and in the winter it runs on a timer for a couple of hours each night to keep the conservatory free from condensation.
    Peter, the desiccant in using is a corroventa, they cost thousands...

    So I was hoping for a recommendation from others that perhaps doesn't cost so much.
    Anyone have any commercial units they could recommend? Those Ecoair units look a bit 'DIY' to be leaving in customers properties
    I've got an Ecoair DD1 Classic Mk5 and had it a few years. I'd recommend it. When the weather isn't suitable for drying clothes outside I dry them with it indoors. The byproduct heat is quite useful in winter when it's often in use.

    I'm guessing though you don't want something intended for domestic use?
    No it must be industrial/commercial use and be up to taking a beating no doubt
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