[Equest-users] Modelling Non AC building in eQUEST

Mon Feb 20 14:24:17 PST 2017

Another sorry  (boy, I'm turning into a sorry character...)

As pointed out by a friend, I made a mistake on the set-points. Heating 
should be way low, like 30F and cooling be way high, like 99F,  to keep 
the fake system from turning on.  My main point, though, is that you 
need to model a system in order to allow for Natural Ventilation, or 
otherwise you would be modeling a greenhouse that's liable to have very 
high internal temperatures.

Joe

Joe Huang 	
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556t
http://weather.whiteboxtechnologies.com for simulation-ready weather data
http://www.whiteboxtechnologies.com
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"

On 2/17/2017 10:59 PM, Joe Huang via Equest-users wrote:
> Sorry,
> last message got sent out inadvertently while I was editing it.  The 
> full message is contained below.
>
> -------- Forwarded Message --------
> Subject: 	Re: [Equest-users] Modelling Non AC building in eQUEST
> Date: 	Fri, 17 Feb 2017 14:59:15 -0800
> From: 	Joe Huang via Equest-users <equest-users at lists.onebuilding.org>
> Reply-To: 	Joe Huang <yjhuang at whiteboxtechnologies.com>
> To: 	equest-users at lists.onebuilding.org
>
>
>
> I have doubts about how you're doing this.  I used to model 
> non-conditioned buildings in Asia by using the Residential (RESYS) 
> system and setting the Heating and Cooling Setpoint temperatures way 
> below or above the actual room temperature so that they never come on, 
> e.g.,  Heating at 99 and Cooand , which uses a different 
> VENT-TEMP-SCHEDULE for the temperature above which windows are 
> expected to open, e.g., 75 F, PROVIDED that the outdoor air 
> temperature or enthalpy is lower.  To be doubly safe, you can set the 
> Heating and Cooling capacity to very small numbers, like 0.1, etc., 
> although that's immaterial because they would never come on.
>
> I don't see how you can derive unmet hours for an unconditioned space, 
> but you can derive the hours above comfort, e.g., 78 F, and tabulate 
> that.  I used to call them Heating or Cooling Discomfort Hours :-)
>
> Joe
>
> Joe Huang 	
> White Box Technologies, Inc.
> 346 Rheem Blvd., Suite 205A
> Moraga CA 94556
> yjhuang at whiteboxtechnologies.com
> http://weather.whiteboxtechnologies.com  for simulation-ready weather data
> http://www.whiteboxtechnologies.com
> (o) (925)388-0265
> (c) (510)928-2683
> "building energy simulations at your fingertips"
> On 2/14/2017 5:34 AM, Kirti Pabrekar - Patil via Equest-users wrote:
>> Dear eQuesters,
>>
>> I have the following doubt.
>>
>> 1. This is a hostel building. all the rooms are non ac except the 
>> wardens cabin and the counselling room. These two rooms have split 
>> units.
>>
>> 2. I have to model this for thermal comfort compliance - so i need to 
>> show that there are less unmet hours in the building.
>>
>> How do I go about this?
>>
>> What i thought was as under,
>>
>> 1. I made the entire model and assigned the ac and non ac spaces as 
>> per design.
>> 2. I plan to put a system in the non ac rooms, such that the CFM 
>> generated due to ceiling fans can be put as Fan Flow Parametres. A 12 
>> hour fan schedule (as per the evening + night time occupancy hours) 
>> can be assigned to this. Other than this there will be no input 
>> parameter assigned to this system - no COP, no efficiency. Other than 
>> this these rooms have to behave as non ac spaces.
>>
>> Now my questions,
>> 1. Do you think this is logical way to do?
>> 2. Is there any other way to go about this?
>> 3. If what i have described in point 2 is okay, while i assigning 
>> systems what should it be? Like Sum or FNSYS or VAVS etc? Please let 
>> me know the specifics
>>
>> Please give me an insight into this ya.
>>
>> Regards
>> Kirti
>>
>> *Kirti Pabrekar - Patil*
>> M. Arch, LEED GA,
>> IGBC AP, GRIHA Trainer & Evaluator,
>>
>> /
>> /
>> /
>> /
>> /
>> /
>> /Green is a commitment...not a competition/
>>
>>
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