Re: [EnergyPlus_Support] Daily Sine wave amplitude.... [1 Attachment]

The chart below from the .stat file is a bit better than the last one sent on visualizing "Daily Sine wave amplitude" Inline image 1

On Sat, Apr 16, 2016 at 12:18 PM, Jeremiah Crossett jcrossett@xxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Another source of monthly hour of day average temperatures is the .stat file (line 64 to 91) that ships with energy plus weather (epw) files, as posted below for Portland OR.

I have found this monthly hour of day average data to be quite useful. I use it to have a better understanding of a site location than just ASHRAE climate zone and have had thoughts about proposing the addition of a weather data classification that accounts for diurnal temperature differences in addition to the current degree day and humidity methods used to classify ASHRAE weather file locations. Also, I have have used this data along with solar data from stat files to make a thermodynamic loads calculator for PCM's that uses similar inputs to E+ with calculations that mimic the E+ heat balance method. https://docs.google.com/spreadsheets/d/1bIrKlOCHp4pyF6eUVm3O3kIeMfRNT5uQ4aYyKfD4BEo/edit?usp=sharing

- Average Hourly Statistics for Dry Bulb temperatures °C

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

0:01- 1:00 4.4 6.0 5.4 8.3 10.2 14.8 16.3 15.6 12.7 10.7 6.4 5.3

1:01- 2:00 4.4 5.9 5.2 8.1 9.6 13.8 15.6 14.8 12.3 10.5 6.3 5.2

2:01- 3:00 4.5 5.8 5.0 7.7 9.3 13.4 14.9 14.2 11.5 10.4 6.1 5.4

3:01- 4:00 4.3 5.4 4.8 7.5 8.9 12.8 14.5 13.7 10.9 10.5 6.2 5.2

4:01- 5:00 4.5 5.3 4.7 7.2 8.7 12.9 14.2 13.4 10.9 10.4 6.2 5.3

5:01- 6:00 4.4 5.3 4.6 7.4 9.4 13.6 14.9 13.7 10.8 10.2 6.3 5.2

6:01- 7:00 4.1 5.2 4.5 8.4 10.5 14.7 16.0 15.2 12.0 10.2 6.0 5.2

7:01- 8:00 4.2 5.5 5.4 9.5 11.6 15.8 17.0 16.8 14.4 11.2 6.2 5.3

8:01- 9:00 4.6 6.3 6.4 10.3 12.6 17.0 18.3 18.2 16.5 12.2 6.8 5.6

9:01-10:00 5.2 7.3 7.6 11.5 13.7 18.1 19.6 19.9 18.5 13.2 7.4 6.3

10:01-11:00 5.9 8.5 8.5 12.3 14.7 19.1 21.3 21.5 20.2 14.5 8.3 6.6

11:01-12:00 6.5 9.3 9.2 13.4 15.4 20.2 22.8 23.3 22.1 15.8 9.0 7.0

12:01-13:00 6.9 9.9 9.9 14.2 16.3 21.3 24.3 24.9 23.5 16.4 9.7 7.1

13:01-14:00 7.0 10.2 10.4 14.9 17.2 22.1 25.4 26.2 24.6 16.7 9.9 7.2

14:01-15:00 7.0 10.6 10.3 15.5 17.6 22.7 26.4 27.2 25.4 16.9 10.0 7.0

15:01-16:00 6.6 10.5 10.4 15.7 17.4 23.2 26.6 27.2 25.4 16.2 9.7 6.8

16:01-17:00 6.0 9.7 9.9 15.3 17.3 23.2 26.5 26.9 24.9 15.5 8.8 6.4

17:01-18:00 5.6 8.6 9.1 14.8 16.8 22.5 25.8 25.9 22.7 14.3 7.8 6.1

18:01-19:00 5.4 7.8 8.0 13.4 15.9 21.4 24.3 23.9 20.0 13.3 7.4 6.0

19:01-20:00 5.1 7.2 7.5 12.0 14.4 19.6 22.4 22.0 17.9 12.5 6.9 5.7

20:01-21:00 5.1 7.1 6.9 11.2 13.2 18.2 20.8 20.4 16.3 11.9 6.9 6.0

21:01-22:00 4.8 6.6 6.4 10.4 12.4 16.8 19.5 19.0 15.5 11.5 6.6 5.7

22:01-23:00 4.6 6.3 6.1 9.6 11.6 16.0 18.4 17.3 14.4 11.0 6.6 5.7

23:01-24:00 4.5 5.9 5.8 9.1 10.8 15.5 17.3 16.4 13.3 11.0 6.4 5.5

Max Hour 14 15 14 16 15 17 16 15 15 15 15 14

Min Hour 7 7 7 5 5 4 5 5 6 7 7 4

This kind of data can easily be plotted in excel or a google sheet. The chart below was made in this google sheet:

https://docs.google.com/spreadsheets/d/1u-pGeaIufwclu4AWid44jmF7CnIRdLSUWY5vhQdjDpU/edit?usp=sharing
Jeremiah Crossett | Chief Technological Officer | NRGsim Inc. | www.nrgsim.com | 7409 SW Capitol Highway Portland OR, 97219 | 503-688-8951
On Sat, Apr 16, 2016 at 11:26 AM, Joe Huang YJHuang@xxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
I caution that Design Days are by definition atypical conditions with the daily maxima corresponding to either the 0.6% or 1% highest hourly temperatures. Furthermore, the hourly profile described below is extremely generic and applied to all locations and conditions. I don't know how you intend to use the "daily variation sine curve", but if it's to understand the average daily temperatures for each month, I would recommend calculating the average daily max/min from the weather file or even easier from Wikipedia, and then use the ASHRAE Design Day Profile
to fill out the 24 hour values. If you want to be more location-specific, you can analyze the weather file to derive the average monthly profiles. Last comment is that the daily profiles are not sine curves.

Joe Sent from my iPad
On Apr 16, 2016, at 9:20 AM, Jim Dirkes jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Dear Heba,
The ASHRAE 2013 Handbook of Fundamentals shows the typical daily temperature range for design days o p 14.11. I doubt that it applies to an entire year, but might be a nice starting point for your work.

On Sat, Apr 16, 2016 at 12:15 PM, hassan_kamel77@xxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

Hello,
I am searching for the daily variation sine wave amplitude for a certain city.
I wonder, if it is included in the weather file !!
or, should we make some kind of equations !!
I am simulating a city, where there's high diurnal range between nighttime and daytime.
Thanks in advance,
Heba

--
James V Dirkes II, PE, BEMP, LEED AP CEO/President The Building Performance Team Inc. 1631 Acacia Dr, GR, Mi 49504 Direct: 616.450.8653 jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx Website l LinkedIn

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