[Equest-users] PTAC vs WLHP Annual Energy Consumption

[Morteza Kasmai]

Dear eQUEST experts,

I am still struggling to find out the main reason(s) for high-energy
consumption of WLHP system comparing to PTAC system and what can be done to
make this system more efficient that the baseline system. In other words
for complying with EAp2 requirements, for a mid rise residential building
what types of HVAC systems (other than split system HP) can be selected
which consume less annual energy than the PTAC.

I would appreciate it if you would share your experience on this and make
some recommendation.

Morteza





On Mon, May 4, 2015 at 4:03 PM, <equest-users-request at lists.onebuilding.org>
wrote:

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>    1. PTAC vs WLHP Annual Energy Consumption (Morteza Kasmai)
>    2. Re: PTAC vs WLHP Annual Energy Consumption (David Reddy)
>
>
> ---------- Forwarded message ----------
> From: Morteza Kasmai <morteza.kasmai at gmail.com>
> To: "equest-users at lists.onebuilding.org" <
> equest-users at lists.onebuilding.org>
> Cc:
> Date: Mon, 4 May 2015 12:04:23 -0400
> Subject: [Equest-users] PTAC vs WLHP Annual Energy Consumption
>
> Dear all,
>
>
> This is a multifamily mid-rise building, 9 floors above grade. Per ASHRAE
> Table G3.1.1A the Baseline HVAC system is system 1 (PTAC with hot-water
> fossil fuel boiler) 9.3 to 11 EER.
> Selected HVAC system for the proposed design is WLHP (3 Ton High
> efficiency HP by Daikin, 15.9 EER and 4.83 COP) with 2 cell cooling tower,
> DOAS unit (9.8 EER) and 2 Boilers (0.92 Eff.).
>
>
>
> Although the efficiency of the selected HVAC systems is much higher than
> the efficiency of the baseline model, the simulation results indicate
> annual energy consumption of the proposed design is much higher than the
> baseline!
>
>
>
> Am I missing something or did something wrong in the models? Please see
> the attached files of the both models
>
> .
> I would greatly appreciate it if anyone kindly gives some feedback on this,
>
>  Morteza
>
>
>
>
>
>
>
>
> ---------- Forwarded message ----------
> From: David Reddy <david at 360-analytics.com>
> To: equest-users at lists.onebuilding.org
> Cc:
> Date: Mon, 04 May 2015 09:39:44 -0700
> Subject: Re: [Equest-users] PTAC vs WLHP Annual Energy Consumption
>  Hi Morteza,
> I have not reviewed the results or detailed inputs of your model, but one
> thing to be aware is that depending on the rating conditions of your
> efficiency data, you may have to adjust the EIRs to be consistent with
> DOE-2 performance curves.  The default DOE-2 curves are normalized to the
> GSHP rating condition, so if using these and if your efficiency data is @
> the WSHP rating condition, you will need to apply these adjustments.
>
> Here is the table from the DOE-2 help provided with eQUEST.  There is a
> library of DOE-2 WSHP curves available from ClimateMaster that do not need
> these adjustments.
>
>
>
> - David
>
> On 5/4/2015 9:04 AM, Morteza Kasmai wrote:
>
>  Dear all,
>
>
> This is a multifamily mid-rise building, 9 floors above grade. Per ASHRAE
> Table G3.1.1A the Baseline HVAC system is system 1 (PTAC with hot-water
> fossil fuel boiler) 9.3 to 11 EER.
> Selected HVAC system for the proposed design is WLHP (3 Ton High
> efficiency HP by Daikin, 15.9 EER and 4.83 COP) with 2 cell cooling tower,
> DOAS unit (9.8 EER) and 2 Boilers (0.92 Eff.).
>
>
>
> Although the efficiency of the selected HVAC systems is much higher than
> the efficiency of the baseline model, the simulation results indicate
> annual energy consumption of the proposed design is much higher than the
> baseline!
>
>
>
> Am I missing something or did something wrong in the models? Please see
> the attached files of the both models
>
> .
> I would greatly appreciate it if anyone kindly gives some feedback on this,
>
>  Morteza
>
>
>
>
>
>
>
>
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