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Engineering Laboratory

Building Energy & Environment Division

Data Dictionary

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There are over 160 sensors in the IBAL and 130 control and feedback signals. All the signals are identified in a meta data file, MetaData.csv. This file includes:

  • measurement_id
    • Name of the sensor/control signal
    • Examples: 
      • ahu1_p_down = pressure transducer downstream of AHU1
      • v2_pos_c = control signal set the position of Valve2
      • v2_pos_fb = feedback signal indicating the actual position of Valve2
      • ahu1_out_rtd = temperature measurement at the outlet of AHU1
      • ahu1_rh_down = relative humidity measurement at the outlet of AHU1
      • ahu1_f_sa = airflow rate in the supply duct to AHU1
      • ahu1_fan_power = power consumption of the AHU1 fan
  • card
    • The data acquisition card connected to the sensor/controller
  • physical_channel
    • Channel used by the data acquisition system to create the connection to the sensor/controller
  • channel_number
    • Number associated with the sensor/controller
  • measurement_type
    • Control
    • Differential pressure
    • Flow
    • Humidity
    • Power
    • Pressure
    • Temperature
  • signal_type
    • RTD – resistance temperature device; temperature measurement
    • AI – analog input
    • AO – analog output
    • DI – digital input
    • DO – digital output
  • Subsystem
    • AHU1
    • AHU2
    • Chiller1
    • Chiller2
    • CondensingLoop
    • CoolingLoad
    • ExhaustFan1
    • ExhaustFan2
    • OAU
    • PrimaryLoop
    • SecondaryLoop
    • ThermalStorage
    • VAV1
    • VAV2
    • VAV3
    • VAV4
    • WaterSideEconomizer
    • ZS1
    • ZS2
    • ZS3
    • ZS4
  • instrument_m_n
    • Manufacturer name of a sensor
  • instrument_s_n
    • Serial number of a sensor
  • calibration_date
    • Date of most recent calibration of a sensor
  • accuracy_scaled
    • Accuracy of the sensor in the scaled units – may be from manufacturer data or based on calibration
  • unit_raw
    • Unit of the raw measurement
    • F
    • Hz
    • mA
    • position
    • V
  • unit_scaled
    • Unit of the scaled measurement
    • F
    • cfm
    • %
    • gpm
    • psi
    • inH2O
    • W
    • fpm
    • A
    • mA
    • V
    • position
  • range_lo_raw
    • Minimum value of the reading
  • range_hi_raw
    • Maximum value of the reading
  • startup
    • Value of the controller at startup
  • shutdown
    • Value of the controller at shutdown
  • scaling_coeff_a0
    • Zeroth coefficient of the polynomial equation for converting from raw to scaled values
    • Scaled = a0 + a1*raw + a2*raw2
  • scaling_coeff_a1
    • First order coefficient of the polynomial equation for converting from raw to scaled values
  • scaling_coeff_a2
    • Second order coefficient of the polynomial equation for converting from raw to scaled values

Contacts

FOR MORE INFORMATION, CONTACT:

Created July 7, 2021