[Equest-users] Equest-users Digest, Vol 86, Issue 4

[Morteza Kasmai]

David,

Thank you for the clarification, using these adjustments will increase the
energy consumption of the proposed model higher that before! I was
wondering if you could confirm that the WLHP uses more energy than PTAC?

Thanks,
Morteza




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

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> Today's Topics:
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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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