[Equest-users] Different cooling loads with different system types

[Sami, Vikram]

For  space loads - see the LS reports. LS-B & C for Peak loads, and LS E & F for monthly loads.

The way eQUEST works is the thermal loads are reported here. This is not the load seen by your system because this does not include ventilation loads.

So thermal loads are reported in LS reports, system loads are reported n the SS reports, and plant loads are reported in the PS reports.

Hope this helps.


Vikram Sami, LEED AP BD+C
Sustainable Design Analyst
1315 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bruce Easterbrook
Sent: Tuesday, January 17, 2012 9:41 AM
To: Walson, Kristy
Cc: 'equest-users at lists.onebuilding.org'
Subject: Re: [Equest-users] Different cooling loads with different system types

Hi Kristy,
The explanation is the loads in the SS-D report are the coil loads of your system units not a full building load.  I ran into it on the SS-J reports on heating loads.  SS-J is a sub report of the SS-D.  The differences will probably be found in under heated or cooled hours and/or in your terminal units.  I noticed it because the low airflow in the ahu was not maximizing the amount of heat the unit could send to the zones.  As I increased the cfm/sf the heating peak increased on the SS-J report.  I assume it would have also increased on the SS-D report.  My underheated hours were decreasing as the peak heating was increasing.
The loads are there, just not on this report.  More information on the reports and what is in each one is in the Detailed Simulation Reports Summary in the DetailedUI folder of the Tutorials section of eQuest.
Bruce Easterbrook P.Eng.
Abode Engineering

On 16/01/2012 01:20 PM, Walson, Kristy wrote:
Hi All,

I am working on a model where the baseline system type is Packaged Single Zone with a Fossil-Fuel Furnace (System Type 3) and the proposed system type is Chilled Water VAV with a Gas-Fired Steam Boiler.  When I take the proposed model, save as, and then just change the system type to the DX CV system, the cooling loads in the SS-D report change.  They are less when the DX CV system.  How can the loads change?  These should stay the same and the energy used to meet these loads should change.  Has anyone run into this before?

Kristy M. Walson, PE, LEED AP BD+C, BEMP
Associate / Sustainability Consultant

TLC Engineering for Architecture
Your 2030 Challenge Partner

255 South Orange Avenue, Suite 1600
Orlando, FL 32801-3463

phone:

407-841-9050

fax:

407-425-7367

direct:

407-487-1118

website:

www.tlc-engineers.com<http://www.tlc-engineers.com>


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