[Equest-users] FW: [Bldg-sim] Discomfort hrs

[Carol Gardner]

What Bill says is true, you are to only have one system per HVAC zone. I
have never taken that to mean, however, that you might not have multiple
spaces/rooms on one zone nor have I received that feedback from the
developers. True, eQUEST insists on providing a zone name for each specified
space, but you can gather the spaces/zones in each HVAC zone and cause them
to be served by one PSZ or other system. Then you have to determine what
your control zone is. After you have done that you go into your zone
spreadsheet and put your heating temp schedules and cooling temp schedules
in your control zone, which is where your thermostat is, and say they are
undefined in the other zones. This should take care of the discomfort hours
provided you carefully selected your control zone. This should not cause the
other spaces to have inadequate heating or cooling since the control zone,
as I understand it, has the highest loads of all the spaces and if it's
satisfied the other spaces are satisfied.

That is my understanding, anyway, and I will accept any/all feedback.
Especially from a BEMP!!

Carol

On Wed, Apr 7, 2010 at 6:39 AM, Bishop, Bill <wbishop at pathfinder-ea.com>wrote:

>  Sambhav,
>
>
>
> Are you modeling the baseline according to Appendix G? If so, and you are
> using PSZ, you should have one system per zone. If you are already modeling
> one system per zone you should not be getting high unmet hours if you let
> eQUEST do the autosizing.
>
>
>
> If you are trying to model a PSZ with multiple zones assigned to it, you
> can do a few things to reduce the unmet hours. As Carol and Rob suggest, you
> can remove the heating and cooling schedules to unconditioned zones. You
> should not do this for conditioned zones (zones that you want to keep within
> a certain temperature range) because you will be letting the temperatures
> float. Your unmet hours will go away but the virtual people in those zones
> will be calling their virtual landlords complaining about being too hot or
> too cold.
>
>
>
> To reduce unmet hours when multiple zones are assigned to a PSZ, try the
> following:
>
> 1.)     change the control zone (try assigning to the zone with most unmet
> hours first)
>
> 2.)     increase/decrease people/lighting/misc loads in the trouble zones
> (and copy the values to the proposed model to keep them identical)
>
> 3.)     change some interior walls to “air walls” (and copy into the
> proposed model)
>
> 4.)     increase the supply air flow rate to individual zones, especially
> if they are undercooled
>
>
>
> Regards,
>
> Bill
>
>
>
> *William Bishop, EIT, BEMP, LEED® AP **|** **Pathfinder Engineers &
> Architects LLP***
>
> Mechanical Engineer
>
>
>
> 134 South Fitzhugh Street
> Rochester, NY 14608
> T: (585) 325-6004 Ext. 114
> F: (585) 325-6005
>
> wbishop at pathfinder-ea.com
>
> www.pathfinder-ea.com
>
> P Please strive to live sustainably.
>   ------------------------------
>
> *From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
> bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Carol Gardner
> *Sent:* Wednesday, April 07, 2010 2:32 AM
> *To:* Rob Hudson
> *Cc:* bldg-sim at lists.onebuilding.org
> *Subject:* Re: [Bldg-sim] Discomfort hrs
>
>
>
> Yes. Only put the heating temp schedules and cooling temp schedules in the
> zone you have selected as the Control Zone. If you use the Spreadsheet
> option you will be able to do this easily. Use the drop down menu and select
> Undefined for all other zones.
>
> Carol
>
> On Tue, Apr 6, 2010 at 9:18 AM, Rob Hudson <rdh4176 at gmail.com> wrote:
>
> If there are more than one zone assigned to the PZS, then remove the
> thermostats to the extra zones.  This happened to me when i attached an
> unconditioned plenum space to a PZS space.
>
>
>
> On Tue, Apr 6, 2010 at 10:52 AM, Vikram Sami <vssami at yahoo.com> wrote:
>
> Have you tried cycling your fans? If you'r doing this for ASHRAE compliance
> you need to do this anyway.
>
> --- On *Tue, 4/6/10, sambhav tiwari <tiwari.sambhav at gmail.com>* wrote:
>
>
> From: sambhav tiwari <tiwari.sambhav at gmail.com>
> Subject: [Bldg-sim] Discomfort hrs
> To: bldg-sim at lists.onebuilding.org
> Date: Tuesday, April 6, 2010, 2:33 AM
>
>
>
> Hi All,
>           In one of project my basline building was having packaged syngle
> zone system but after running i am getting lot of unmet hours for PSZ system
> for each zone almost 450 hrs for basline.
>
> Can any suggest some solution.
>
> Thanks
> Sambhav.
>
>
>
> -----Inline Attachment Follows-----
>
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>   --
> Rob Hudson
>
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