Re: [EnergyPlus_Support] calculated heating load zero

Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions

120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951

www.phasechange.com

On Tue, Sep 11, 2012 at 4:52 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

I used a shortcut:

"Using WinterDesignDay schedules> Correct me if I am wrong Design Days
are not a "schedule" by object classification
ASHRAE 99.6% winter design day"

If the daytype of the designday is "WinterDesignDay", then the program
uses the values for that day in any schedule item. We suggest not to
setback temperatures (for example) when doing sizing calculations, even
if you are doing that in regular runs.

The WinterDesignDay schedule/day type allows you to codify the schedule
for the simulation without fiddling with various days.

On 2012-09-11 17:47, Jeremiah Crossett wrote:
> Thanks Linda-For the items you suggest I have the following values:
>
> Infiltration> I thought this was correct by now less sure>
>
> * Using AirFlow network so standard infiltration object was removed-

> I will investigate this as a possibility. (I guess I will try to
> add 3.5 ACH with airflow network, or if needed delete the airflow
> network and add an infiltration object)
>
> Internal gains>I have went through these in detail>
>
> * Lighting is per AHRAE 90.1 (dorm room 4.1 W.m2) , Equipment is per

> design (1 W/SQFT) People 5 m2/person
>
> Using WinterDesignDay schedules>  Correct me if I am wrong Design
> Days are not a "schedule" by object classification
>
> * ASHRAE 99.6% winter design day
>
> JEREMIAH D. CROSSETT  | Senior Analyst  | Phase Change Energy
> Solutions
> 120 E. PRITCHARD ST. | ASHEBORO, NC 27203 | MOBILE 503-688-8951

>
>
>
>
>
> On Tue, Sep 11, 2012 at 4:08 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx
> [3]> wrote:
>
>>
>>
>> Add infiltration?
>> Checked internal gains?
>> Using WinterDesignDay schedules?
>>
>> At 05:01 PM 9/11/2012, Jeremiah Crossett wrote:
>>
>>> Hello-
>>> It seems that no matter what I do to this file it results in this
>>> warning-
>>>
>>> ** Warning ** Calculated design heating load for
>>> zone=BLOCK1:ZONE1 is zero.
>>>    **   ~~~   ** Check Sizing:Zone and
>>> ZoneControl:Thermostat inputs.
>>>
>>> I have checked and changed out thermostats, changed setpoints,
>>> changed wall and roof insulation thickness etc but nothing seems
>>> to make this file come close to the designed heating load of 2600
>>> Btu/h..
>>>
>>> Anyone have advise please?
>>>
>>> Thanks
>>>
>>> Jeremiah D. Crossett | Senior Analyst | Phase Change Energy
>>> Solutions
>>> 120 E. Pritchard St. | Asheboro, NC 27203 | Mobile
>>> 503-688-8951 [1]
>>> www.phasechange.com [2]

>>>
>>>
>>>
>>>
>>> Content-Type: application/octet-stream; name="DormRooomNoPCM.idf"
>>> Content-Disposition: attachment; filename="DormRooomNoPCM.idf"
>>> X-Attachment-Id: f_h6zlnc9s0
>>>
>>> Content-Type: application/zip;
>>>          name="USA_CA_Los.Angeles.Intl.AP.722950_TMY.zip"
>>> Content-Disposition: attachment;
>>>
>>> filename="USA_CA_Los.Angeles.Intl.AP.722950_TMY.zip"
>>> X-Attachment-Id: f_h6zlqrm21
>
>
>
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