[Bldg-sim] Length of cooling (and heating) season

[Dennis Knight]

Alan,
Similar to Julien's comment - and as usual, it depends. A judgement can
often be made by looking at the weather data. For degree days it is often
customary to use base 65 Degrees F for residential and base 55 Degrees F
for commercial applications. However, you need to add to your decision
making process questions like - what is the building type, occupancy, does
the building have a lot of internal space, large exterior exposures,
percent glazing, heavy or light internal loads, etc. You can look at load
profiles for similar buildings in similar climate zones . For example, you
could take the documentation for the 16 DOE reference buildings run across
multiple climate zones and get a feel for when the buildings go into either
heating or cooling mode and at what outdoor air temperature(s).
Dennis

On Friday, July 4, 2014, Abela, Alan 2010 (PGR) <alan.abela2010 at my.ntu.ac.uk>
wrote:

>   Thanks all
>
>
>  Anything specific re cooling season rather than heating season
>
>
>  Even when it comes to degree days, I am not so sure about the selection
> of the reference temperature.
>
> ​
>
>
>  *ALAN ABELA*
>
> *Doctoral Research Student*
> *School of Architecture, Design and the Built Environment*
> *Nottingham Trent University*
>   ------------------------------
> *From:* Bldg-sim <bldg-sim-bounces at lists.onebuilding.org
> <javascript:_e(%7B%7D,'cvml','bldg-sim-bounces at lists.onebuilding.org');>>
> on behalf of Julien Marrec <julien.marrec at gmail.com
> <javascript:_e(%7B%7D,'cvml','julien.marrec at gmail.com');>>
> *Sent:* 03 July 2014 17:09
> *To:* Max D
> *Cc:* bldg-sim at lists.onebuilding.org
> <javascript:_e(%7B%7D,'cvml','bldg-sim at lists.onebuilding.org');>
> *Subject:* Re: [Bldg-sim] Length of cooling (and heating) season
>
>   Sometimes it is mandatory and defined in the (local) law (ex: in NYC,
> heating season is October 1st to May 31st for multiple dwellings)
>
>  In other cases it's likely more a combination of common sense/following
> weather.
>
>  You could infer that pretty quickly yourself. Get some typical weather
> data, at least daily. Whenever you've got X days dropping below say
> 13.5°C/55°F (I think 2<= X <= 5 is appropriate), you're probably in heating
> season...
>
>  I just tested for NYC and it worked well. I also know in Paris, for
> affordable housing, they use that with X=2.
>
>  Best,
>  Julien
>  --
> Julien Marrec, EBCP, BPI MFBA
> Ingénieur en efficacité énergétique du bâtiment
> T: +33 6 95 14 42 13
> www.julienmarrec.com
>
> DoYouBuzz : www.doyoubuzz.com/julien-marrec_1
> LinkedIn (fr) : www.linkedin.com/in/julienmarrec/fr
>  LinkedIn (en) : www.linkedin.com/in/julienmarrec
>
>
> 2014-07-03 16:44 GMT+02:00 Max D <lists at spacesustainers.org
> <javascript:_e(%7B%7D,'cvml','lists at spacesustainers.org');>>:
>
>> Hi Alan, just a thought - have you looked at Degree Day methods..?
>> http://en.wikipedia.org/wiki/Heating_degree_day
>>
>> Best,
>> Max
>>
>> > "Abela, Alan 2010 (PGR)" <alan.abela2010 at my.ntu.ac.uk
>> <javascript:_e(%7B%7D,'cvml','alan.abela2010 at my.ntu.ac.uk');>> hat am 3.
>> Juli 2014 um
>> > 16:32 geschrieben:
>>  >
>> >
>> >
>> >
>> > Hi everybody
>> >
>> > This seems a really basic question to me, but  I have been unable to
>> trace
>> > much information on it.
>> >
>> > What methods exist for the definition of the length of the heating and
>> cooling
>> > seasons prior to the performance of an energy simulation.
>> >
>> > I am aware that the European Standard EN13790 provides a method for
>> doing
>> > this, but are there are any other methods?
>> >
>> > Alternatively is there any record of established national practice, eg
>> heating
>> > on from Dec to Mar in a particular country and cooling on from Jun to
>> Sept?
>> >
>> > Sometimes simulation can generate cooling loads on a year round basis at
>> > certain times of day, although the cooling system is not normally on
>> for 12
>> > months of the year.
>> >
>> > I am looking for a justifiable way to filter out these loads.
>> >
>> > Alan Abela
>> >
>> > Doctoral Research Student
>> > School of Architecture, Design and the Built Environment
>> > Nottingham Trent University
>> >
>> >
>> >
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>

-- 
M. Dennis Knight, P.E., FASHRAE
Founder & CEO
*W*hole *B*uilding *S*ystems, LLC
P.O. Box 1845
Mt. Pleasant, SC 29465
Phone: 843-437-3647
Email: dknight at wholebuildingsystems.com
Website: www.wholebuildingsystems.com
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