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

Dru.Crawley at bentley.com Dru.Crawley at bentley.com
Thu Jul 10 06:27:22 PDT 2014
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As someone noted, the EnergyPlus weather files (EPW) statistics .STAT file contains seasons from the specific weather file… NOT from the long-term record.  For example:

Statistics for USA_VA_Arlington-Ronald.Reagan.Washington.Natl.AP.724050_TMY3
….
- Typical/Extreme Period Determination

- Summer is Jun:Aug
     Extreme Summer Week (nearest maximum temperature for summer)
     Extreme Hot Week Period selected: Jul 27:Aug  2, Maximum Temp=  36.70°C, Deviation=| 7.665|°C
     Typical Summer Week (nearest average temperature for summer)
    Typical Week Period selected: Jul 20:Jul 26, Average Temp=  25.78°C, Deviation=| 0.283|°C

- Winter is Dec:Feb
     Extreme Winter Week (nearest minimum temperature for winter)
     Extreme Cold Week Period selected: Feb  3:Feb  9, Minimum Temp= -13.90°C, Deviation=| 9.545|°C
     Typical Winter Week (nearest average temperature for winter)
     Typical Week Period selected: Jan 27:Feb  2, Average Temp=   3.45°C, Deviation=| 0.193|°C

- Autumn is Sep:Nov
     Typical Autumn Week (nearest average temperature for autumn)
     Typical Week Period selected: Oct 20:Oct 26, Average Temp=  14.44°C, Deviation=| 0.753|°C

- Spring is Mar:May
     Typical Spring Week (nearest average temperature for spring)
     Typical Week Period selected: Apr 12:Apr 18, Average Temp=  12.61°C, Deviation=| 0.851|°C


Statistics for GBR_London.Gatwick.037760_IWEC
…..
- Typical/Extreme Period Determination

- Summer is Jun:Aug
     Extreme Summer Week (nearest maximum temperature for summer)
     Extreme Hot Week Period selected: Aug 17:Aug 23, Maximum Temp=  31.30°C, Deviation=|12.677|°C
     Typical Summer Week (nearest average temperature for summer)
     Typical Week Period selected: Jun 29:Jul  5, Average Temp=  16.36°C, Deviation=| 0.115|°C

- Winter is Dec:Feb
     Extreme Winter Week (nearest minimum temperature for winter)
     Extreme Cold Week Period selected: Dec  1:Dec  7, Minimum Temp=  -5.90°C, Deviation=| 6.758|°C
     Typical Winter Week (nearest average temperature for winter)
     Typical Week Period selected: Jan 20:Jan 26, Average Temp=   4.50°C, Deviation=| 0.562|°C

- Autumn is Sep:Nov
     Typical Autumn Week (nearest average temperature for autumn)
     Typical Week Period selected: Nov 10:Nov 16, Average Temp=  10.74°C, Deviation=| 0.101|°C

- Spring is Mar:May
     Typical Spring Week (nearest average temperature for spring)
     Typical Week Period selected: Apr 19:Apr 25, Average Temp=   9.22°C, Deviation=| 0.397|°C



Statistics for PRI_San.Juan.Intl.AP.785260_TMY3
….
- Typical/Extreme Period Determination
- No discernible dry period.....
     Week closest to average annual temperature selected for Typical Period
     Typical Week Period selected: Apr 30:May  6, Average Temp=  26.57°C, Deviation=| 0.029|°C
- Extremes Selected from annual Min/Max
     Week closest to maximum annual temperature selected for Typical Period
     Extreme Hot Week Period selected: Jul 23:Jul 29, Maximum Temp=  34.40°C, Deviation=| 5.810|°C
     Week closest to minimum annual temperature selected for Typical Period
     Extreme Cold Week Period selected: Jan  1:Jan  7, Minimum Temp=  19.40°C, Deviation=| 4.774|°C


From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Dennis Knight
Sent: Friday, July 04, 2014 12:11 PM
To: Abela, Alan 2010 (PGR)
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Length of cooling (and heating) season

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<mailto: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
--
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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
Whole Building Systems, LLC
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