Elements A Weather File Viewer/Editor/Processor

Transcription

1 Elements A Weather File Viewer/Editor/Processor Michael P. O Keefe Big Ladder So6ware elements@bigladderso6ware.com Chicago IBPSA Weather Data Webinar Thursday, January 21, :00 Noon to 12:30 PM

2 Acknowledgments We would like to acknowledge the support of: Ellen Franconi, Ph.D., Rocky Mountain Institute Kendra Tupper, P.E., City of Boulder, CO Hayes Zirnhelt, Rocky Mountain Institute

3 Outline/Agenda Motivation Architecture Functionality Demo

4 MOTIVATION

5 Weather files are required for building energy modeling. source: hqp://images.nrel.gov/viewphoto.php?imageid= (NREL EULA)

6 Weather data is available! source: hqps://commons.wikimedia.org/wiki/file:iceberg_b- 15A_weather_instrument.jpg (public domain)

7 Objective: Common Processing, Analysis, & Visualization Tasks For Weather Files In a Single Tool

8 What is Elements? Free, Open- Source Graphical User Interface SI/IP Units EPW, DOE2 FMT (text) or BIN Visualizaion and Ediing 1 st Release Fall 2014 Windows and Mac hqp://bigladderso6ware.com/projects/elements/

9 ARCHITECTURE

10 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

11 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

12

13 data set

14 header

15 header

16 Jme series

17 Jme series akribute

18 Jme series akribute

19 data point

20 value

21 Two Kinds of Values: raw values derived (T db, T wb, P) f RH RH (T db, T wb, P) f DP T dp (T db, T wb, P) f h h

22 To avoid inconsistency, only store the minimum to define a state point (T db, T wb, P)

23 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

24 File Format Lots of weather file data sets and data formats. WYEC2 epw IWEC CWEC TMY DOE2 bin TMY3 TMY2 AMY EWY TRY-US TRY-ROW Conversion important!

25 DOE- 2 FMT DOE- 2 FMT DOE- 2 BIN import process export DOE- 2 BIN EPW EPW

26 DOE- 2 FMT DOE- 2 FMT DOE- 2 BIN import process export DOE- 2 BIN EPW EPW How to store data from any weather file in a cross- plakorm way?

27 DOE- 2 FMT DOE- 2 FMT DOE- 2 BIN import process export DOE- 2 BIN EPW EPW Elements Elements

28 File Format <file- name>.elements This folder is zip compressed* header.csv* city, "City Name" country, "Country Name" elevation_m, 0 latitude_deg, 0 longitude_deg, 0 refdayofmonth, 1 cloudcover, drybulbtemp_c, elapsedtime_hrs,. refhourofday, 0 0, 15, 0,... 0, 15, 1,... 0, 15, 2,... 0, 15, 3,... 0, 15, 4,... imeseries.csv* *RFC 4180: Common Format and MIME Type for Comma- Separated Values (CSV) Files ** ZIP File Format Specificaion

29 ZIP + CSV (Elements) = Same informajon as EPW with size comparable to DOE- 2 BIN EPW DOE- 2 FMT Elements DOE- 2 BIN Comparison of Chicago TMY Weather File in Various Formats SIZE (MB)

30 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

31 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

32 FILE EXPORT Internal Data VISUALIZE FILE IMPORT CUT/ PASTE CHANGE SPREADSHEET APP BUILDING ENERGY MODELER

33 Change Management: Do not allow inconsistent state BUILDING ENERGY MODELER

34 FUNCTIONALITY

35 Is this data valid? Humidity RaJo (g H2O/g Dry Air) Dry Bulb Temperature (F) Wet Bulb Temperature (F) RelaJve Humidity (%) at 1 atmosphere

36 Is this data? valid

37 Is this data? valid Tdb = 55 F

38 Is this data? valid Tdb = 55 F Twb = 45 F

39 Is this data? valid Tdb = 55 F Twb = 45 F RH = 30%

40 Is this data? valid Tdb = 55 F Twb = 45 F RH = 30% HR = 0.005

41 Ediing weather files in a SPREADSHEET is inherently ERROR PRONE! but IT s how we EDIT...

42 so WHAT to DO?

43 Constraining Non Physical Updates

44 Safe Updates = what to change + what to hold constant

45 Change DRY BULB to 50F...

46 at constant RelaJve Humidity?

47 at constant Humidity RaJo?

48 at constant Enthalpy?

49 Constraining Non Physical Updates

50

51 RelaJve Humidity 73

52 RelaJve Humidity 73

53 RelaJve Humidity 110

54 RelaJve Humidity 100

55 Safe Updates

56 Safe Updates

57

58 Dry Bulb 40 Wet Bulb 31.3 RelaJve Humidity 33 Dew Point 15.3

59 Dry Bulb 75 Wet Bulb RelaJve Humidity 33 Dew Point 44.02

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61 Only 8,759 more data points to go!

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72 STATUS

73 Status Usable Useful Functionality Open-source, open to collaboration! More we d like to do!

74 Conclusions We need to view/edit weather data No inconsistent state Not finished, but functional Free and Open-source: try it out!

75 Bibliography Y. Shafronovich Common Format and MIME Type for Comma-Separated Values (CSV) Files. Network Working Group. Request for Comments 4180 (RFC 4180). Available online: (last accessed August 10, 2015) ZIP File Format Specification. Version PKWARE Inc. Available online:

76 Questions? Michael P. O Keefe elements@bigladdersoftware.com