[Greenbuilding] small in line heat pump

Gennaro Brooks-Church - Eco Brooklyn info at ecobrooklyn.com
Thu Mar 22 15:04:09 CDT 2012


Stuart I love that solution. I have heard rumors of this being done but
never heard anyone who succeeded. Getting the cfm high enough while still
keeping the system balanced was a real obstacle.

Gennaro Brooks-Church
Director, Eco Brooklyn Inc.
Cell: 1 347 244 3016 USA
www.EcoBrooklyn.com
22 2nd St; Brooklyn, NY 11231



On Thu, Mar 22, 2012 at 3:54 PM, Stuart Fix <sfix at renubuildings.com> wrote:

> Hi Alan,
>
> Check out the Mitsubishi Mr. Slim series. They go down to 9000 Btu/h, and
> can operate to -20C. We've built a prototype that uses their ducted
> fancoil unit inline with the ERV supply, with the addition of a return air
> duct to feed the extra CFM.
>
> So in operation:
>
> - ERV operates continuously, 100-200CFM, blowing through the fancoil (must
> use extremely efficient ERV for this to make sense, try UltimateAir
> RecoupAerator)
>
> - Fancoil kicks on as heating or cooling requires, using the 100-200CFM of
> the ERV and sucks an additional  300-500 CFM through the return air duct.
> Using the RecoupAerator makes this easy, as its ECM motors are self
> balancing, so it'll compensate as the Fancoil depressurizes the system.
>
> In addition, if your climate is cold enough to require it, the Mitsubishi
> makes a PAC controller that lets you use the fancoil with an inline
> electric heater even when the condensing unit outside has locked out due
> to cold weather.
>
> You'll end up upsizing the supply trunk to around 10", but that's still
> small enough for the ERV to handle by itself.
>
> This may not have made sense, drop me a line if you'd like more info or a
> sketch.
>
> Cheers,
>
> Stuart Fix, P.Eng., LEED® AP
> PHI Certified Passive House Designer
> MASc. Building Science
> Mechanical Engineer
> ReNü Building Science Inc.
>
> #206, 506B St. Albert Trail | St. Albert, Alberta | T8N 5Z1 | C.
> 780.554.8192 | sfix at renubuildings.com
>
>
> Message: 1
> Date: Thu, 22 Mar 2012 11:43:26 -0400
> From: Alan Abrams <alan at abramsdesignbuild.com>
> To: listserv Green Building new
>        <greenbuilding at lists.bioenergylists.org>,
>        healthyhomebuilding at yahoogroups.com
> Subject: [Greenbuilding] small in line heat pump
> Message-ID:
>
> <CADj3_s6M8kN0nE_T-N=mha3KQhVh-0f+1dwdaKG_2myfrC87gg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> anyone know of a small capacity (12K - 18KBtu) heatpump, suitable for
> installation in line with an ERV?
>
> -a
>
>
> *Alan Abrams**
> Abrams Design Build LLC*
> *A sustainable approach to beautiful space*
>
> 6411 Orchard Avenue Suite 102
> Takoma Park, MD 20912
> office  301-270-NET- ZERO (301-270-6380)
> fax      301-270-1466
> cell     202-437-8583
> alan at abramsdesignbuild.com
> www.abramsdesignbuild.com
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> Message: 2
> Date: Thu, 22 Mar 2012 14:25:37 -0400
> From: John Straube <jfstraube at uwaterloo.ca>
> To: Green Building <greenbuilding at lists.bioenergylists.org>
> Cc: healthyhomebuilding at yahoogroups.com
> Subject: Re: [Greenbuilding] small in line heat pump
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>
> Thats a tough one Mr Abrams
> To deliver 12 KBtu you need about 400, preferably 450 cfm.  So what kind
> of ERV is it? most residential scale ERVs are like 50 to 150 cfm to serve
> normal size homes. 400 cfm ERV must be for a commercial use?
> If you are talking water source HP, Trane  and Florida Heat Pump (now
> bosch) makes a line of water to water heat pumps that small, and you use a
> stadard coil in the air stream.
> For air to air, all of the standard split units (meaning you can put the
> coil in a duct airstream) start at 18 kBtu/hr.  Which requires a lot more
> airflow yet again. But Goodman Trane Carrier all make units at 1.5 tons,
> they are just not that efficient.
>
> On 12-03-22 11:43 AM, Alan Abrams wrote:
> > anyone know of a small capacity (12K - 18KBtu) heatpump, suitable for
> installation in line with an ERV?
> >
> > -a
> >
> >
> > *Alan Abrams**
> > Abrams Design Build LLC*
> > /A sustainable approach to beautiful space/
> >
> > 6411 Orchard Avenue Suite 102
> > Takoma Park, MD 20912
> > office 301-270-NET- ZERO (301-270-6380) fax 301-270-1466 cell
> > 202-437-8583 alan at abramsdesignbuild.com
> > <mailto:alan at abramsdesignbuild.com>
> > www.abramsdesignbuild.com <http://www.abramsdesignbuild.com/>
> >
> >
> >
> > _______________________________________________
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> > ioenergylists.org
>
> --
> Prof. John Straube, Ph.D., P.Eng.
> Faculty of Engineering
> Dept of Civil Engineering / School of Architecture
>
> www.buildingscience.com
>
>
>
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