Application Guide for EMS — EnergyPlus 8.4

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Sizing[LINK]

Several internal variables relate to sizing calculations. Although the primary intent for the EMS is to enable custom controls for operation, using internal variables is a prime example of extending the power of user-defined calculations to control certain aspects of sizing calculations.

Sizing:Zone[LINK]

A series of internal variables is available related to zone sizing:

  • Final Zone Design Heating Air Mass Flow Rate (kg/s)

  • Intermediate Zone Design Heating Air Mass Flow Rate (kg/s)

  • Final Zone Design Cooling Air Mass Flow Rate (kg/s)

  • Intermediate Zone Design Cooling Air Mass Flow Rate (kg/s)

  • Final Zone Design Heating Load (W)

  • Intermediate Zone Design Heating Load (W)

  • Final Zone Design Cooling Load (W)

  • Intermediate Zone Design Cooling Load (W)

  • Final Zone Design Heating Air Density (kg/m3)

  • Intermediate Zone Design Heating Air Density (kg/m3)

  • Final Zone Design Cooling Air Density (kg/m3)

  • Intermediate Zone Design Cooling Air Density (kg/m3)

  • Final Zone Design Heating Volume Flow (m3/s)

  • Intermediate Zone Design Heating Volume Flow (m3/s)

  • Final Zone Design Cooling Volume Flow (m3/s)

  • Intermediate Zone Design Cooling Volume Flow (m3/s)

  • Zone Outdoor Air Design Volume Flow Rate (m3/s)

Sizing:System[LINK]

A series of internal variables is available related to air system sizing:

  • Intermediate Air System Main Supply Volume Flow Rate (m3/s)

  • Intermediate Air System Coincident Peak Cooling Mass Flow Rate (kg/s)

  • Intermediate Air System Coincident Peak Heating Mass Flow Rate (kg/s)

  • Intermediate Air System Noncoincident Peak Cooling Mass Flow Rate (kg/s)

  • Intermediate Air System Noncoincident Peak Heating Mass Flow Rate (kg/s)

  • Intermediate Air System Heating Volume Flow Rate (m3/s)

  • Intermediate Air System Cooling Volume Flow Rate (m3/s)

  • Air System Cooling Design Sensible Capacity (W)

  • Air System Heating Design Sensible Capacity (W)

  • Air System Preheating Design Sensible Capacity (W)

  • Air System Outdoor Air Design Volume Flow Rate (m3/s)

  • Air System Cooling Design Mixed Air Temperature (C)

  • Air System Cooling Design Mixed Air Humidity Ratio (kgWater/kgDryAir)

  • Air System Cooling Design Return Air Temperature (C)

  • Air System Cooling Design Return Air Humidity Ratio (kgWater/kgDryAir)

  • Air System Cooling Design Outdoor Air Temperature (C)

  • Air System Cooling Design Outdoor Air Humidity Ratio (kgWater/kgDryAir)

  • Air System Heating Design Mixed Air Temperature (C)

  • Air System Heating Design Mixed Air Humidity Ratio (kgWater/kgDryAir)

  • Air System Heating Design Return Air Temperature (C)

  • Air System Heating Design Return Air Humidity Ratio (kgWater/kgDryAir)

  • Air System Heating Design Outdoor Air Temperature (C)

  • Air System Heating Design Outdoor Air Humidity Ratio (kgWater/kgDryAir)

Sizing:Plant[LINK]

An internal variable is available for plant system sizing.

  • Plant Design Volume Flow Rate (m3/s)