RE: [EnergyPlus_Support] Daily Sine wave amplitude....

Joe,

Thank you for sharing the FIN4toExcel spreadsheet. I have added a sheet for HDD, CDD � the user cann specify the temperatures for calculating the degree days.

Christopher Jones, P.Eng.
Senior Engineer

WSP Canada Inc.

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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Saturday, April 16, 2016 7:34 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Daily Sine wave amplitude.... [1 Attachment]

Jeremy,

I think another way to visual the average daily temperature is just to plot them as 12 daily time-series.
Following is what I do with a canned spreadsheet that's available for free at www.whiteboxtechnologies.com/UTILITIES/FIN4toExcel.xlsm
Caveat: FIN4toExcel.xlsm is set up to read the *.FIN4 format that I use for my weather files.

Joe

Joe Huang

White Box Technologies, Inc.

346 Rheem Blvd., Suite 205A

Moraga CA 94556

yjhuang@xxxxxxxxxxxxxxxxxxxxxxxx

http://weather.whiteboxtechnologies.com for simulation-ready weather data

(o) (925)388-0265

(c) (510)928-2683

"building energy simulations at your fingertips"

On 4/16/2016 12:25 PM, Jeremiah Crossett jcrossett@xxxxxxxxxx [EnergyPlus_Support] wrote:

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

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 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

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Posted by: "Jones, Christopher" <Christopher.r.Jones@xxxxxxxxxxxx>

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