[Equest-users] PTAC and PTHP

[deepika khowal]

thanks for the suggestions..
For my model, I am trying to figure out which unit will give me maximum
energy savings and which can also be used in real life project. I want to
validate the modeling results with actual performance results. and then
decide which equipment will I actually install in my room.
Thanks
Regards
Deepika
On Thu, Nov 4, 2010 at 12:44 PM, <
Gary.Schrader at buildings.schneider-electric.com> wrote:

>  In addition to Eddie’s comments, I would advise referring to
> manufacturer’s documentation for heat pump performance. Performance varies
> by brand, model, capacity, and ambient conditions. I have experience with
> several heat pumps operating well into the teens. Others claim they can
> perform well below zero. Capacity charts and performance curves will tell
> you what the capacity is at various conditions. For the purposes of your
> model, I would ensure that you are using performance curves reflective of
> the equipment you intend to install in your room.
>
>
>
> -Gary
>
>
>
> _______________________________________________________________________________________________________________________
>
> *Gary Schrader* | *Schneider Electric *| *Buildings Business* | *Energy
> Solutions *| *Engineer I*
> *Phone:* +1 913 217 8068 | *Fax: *+1 913 469 0206
> *Email: *gary.schrader at buildings.schneider-electric.com | *Site: *
> www.schneider-electric.com/buildings | *Address: *16011 College Boulevard,
> Suite 212, Lenexa, KS 66219, USA
>
> *** Please consider the environment before printing this email.
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>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Eddie Corwin
> *Sent:* Thursday, November 04, 2010 2:17 PM
> *To:* deepika khowal; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] PTAC and PTHP
>
>
>
> A heat pump are a MUCH more efficiency way of heating.   The only issue
> with heat pumps are that they do not work well in cold weather (<40*F)
>  below this temperature, they are pretty much electric resistance heaters.
>  A lot of improvements have been made, for example, the Mitsubishi Citi
> Multi-Split systems can operate at temperatures as low as 13*F.  For these
> types of systems, they operate as Heat pumps at 40*F and above.  At 40*F and
> below, they use electric resistance heat to warm the air flowing over the
> outdoor unit (allowing for heat transfer between the air and
> the refrigerant).  So once you get down to 13*F they start to use a lot of
> electric resistance heating.  Still much better that pure electric
> resistance heating!
>
>
>
> -Eddie
>
>
>  ------------------------------
>
> *From:* deepika khowal <deepika.khowal at gmail.com>
> *To:* equest-users at lists.onebuilding.org
> *Sent:* Thu, November 4, 2010 2:52:38 PM
> *Subject:* [Equest-users] PTAC and PTHP
>
> HI
>
> I am trying to model a room with 80% glazing which has a wall unit air
> conditioner.
>
> what will be the difference PTAC using electric heat / heat pump for
> heating ?
>
> which one is advisable in terms of efficiency and energy savings?
>
> does anyone has any thought on this?
>
> Thanks
>
> Regards
>
> Deepika
>
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