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Taking Measurements

It's go time - Measurements

Once everything is in place and the lights have warmed up, measurements can take place.

Please open the pod bay doors HAL - Computer Start-up

The Lab Assistant will start-up and log into the data logging computer.

Name your file - File Creation

A personal data file (Microsoft Excel 2003) for each user will be created from a template data-logging file by the Lab Assistant. Alterations may be made as needed to the user's personal file. The template file however, should NEVER be opened or altered.

Prepare for take-off - Software Start-up

The Lab Assistant will open the data logging software which consists of Microsoft Excel spreadsheet with a plug-in that runs the data collection device connected to the sensors. At this point the user may enter project specific information including identifying information for the project and each data row and any correction factors desired for glazing VLT, framing obstructions and dirt on the glazing system. Refer to the image for a view of the sample spreadsheet.

Flying under the radar - Below the Horizon

It is possible for persons to remain inside the sky chamber during testing provided that they stay entirely below the horizon. The artificial sky's door should be closed during all testing sessions.

Data Extraction

 
Be a number lumberjack - Datalogging
Once everything is ready, the Lab Assistant will place the cursor in the appropriate spreadsheet cell and command the data collection to begin. The sensors are scanned multiple times and the results averaged to account for minor variations in the lamp output of the sky. Once the cells for 5 sample measurements are filled the lab assistant will stop collection for the data row. A typical scan of all 10 sensors for a data row takes only about 10 seconds. Much more time will be spent by the user positioning the sensors or interpreting the results than actually collecting the measurements.

It's done automatically - Data Manipulation

As the measurements are collected a series of necessary manipulations are performed automatically by the Excel software spreadsheet.

  • Multiple Sensor Readings are averaged
  • Readings are corrected for glazing VLT
  • Readings are corrected for glazing framing factor
  • Readings are corrected for glazing dirt factor
  • Resulting Daylight Factor values are calculated and presented
  • Resulting data rows are graphed as a 2-D iso-DF plot
  • Resulting data rows are graphed as a 3-D iso-DF plot
Center for Energy Research/Education/Service (CERES)
Architecture Building, Room 018
Ball State University
Muncie, IN 47306

Hours: Academic Year: 8 a.m. - 5 p.m.
Summer: 7:30 a.m. - 4 p.m.
Phone: 765-285-1135
Fax: 765-285-5622
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