Print Ventilation Schedule

This section describes what is printed when ☐ Print Ventilation Schedule is checked in the Print Load Calculations dialog box.

A different table is printed depending upon the value of the Ventilation Calculation Method ▾ field in the Project Info command.

Minimum

Ventilation Schedule

When the Ventilation Calculation Method ▾ field is set to Minimum, the Ventilation Schedule table lists each room and zone in the project and the ventilation requirements for the space.

•  Location All of the zones and rooms in the project. Rooms and zones that are part of a zone are indented and listed below the parent zone.

•  Room Type Only used for rooms. Set using the Room Type ▾ field in the Edit Rooms command.

  For zones, the cell is blank.

•  Ventilation Requirements Set using the Cooling 1, Cooling 2, Heating 1, and Heating 2 fields in the Ventilation section of the Edit Rooms or Room Project Schedule command.

•  Area The area of the room. Set based upon the room boundary inserted on the drawing.

•  People The total number of people in the room or zone. If ☐ Allow Fractional People is unchecked in the Project Info command, this value will be rounded to the nearest whole person.

  For rooms, set using the SF / Person or People fields in the People section of the Edit Rooms or Room Project Schedule command.

  For zones, set using the SF / Person or People field in the Zone List command. If a value is not specified in these fields, the number of people is the sum of the people in the rooms in the zone.

•  Ventilation CFM The ventilation airflow for the room or zone.

  For rooms, set using the Cooling 1 and Cooling 2 fields in the Ventilation section of the Edit Rooms or Room Project Schedule command.

  For zones, the ventilation airflow is the sum of the airflows of the rooms in the zone.

•  Supply CFM The supply airflow required to condition the room or zone. This value is the same as the Required Supply CFM column in the Supply Air Requirements table in the Print Supply Air Requirements section.

•  Ventilation % The percentage of supply air that is outside air. Equal to the Ventilation CFM column divided by the Supply CFM column.

2006 International Mechanical Code

Ventilation Schedule

When the Ventilation Calculation Method ▾ field is set to 2006 International Mechanical Code, the Ventilation Schedule table contains sections for the zones in the project. If the whole building is selected to be printed in the Zone or Room to Print ☰ list, then every zone will be listed. If specific zones are selected, then only the selected zones are displayed and no sections are displayed.

The labels in parentheses for the columns are the names of the variables used in the 2006 IMC calculations.

The room with the highest Uncorrected OSA, Fraction is highlighted in bold.

Each zone is displayed as a separate section in the table. A header with the name of the zone is displayed at the top of each section.

•  Location The zone and the rooms in the zone. Rooms are indented below the zone.

•  Room Type Only used for rooms. Set using the Room Type ▾ field in the Edit Rooms command.

  For zones, the cell is blank.

•  Ventilation Requirements Set using the Cooling 1, Cooling 2, Heating 1, and Heating 2 fields in the Ventilation section of the Edit Rooms or Room Project Schedule command.

•  Area The area of the room. Set based upon the room boundary inserted on the drawing.

•  People The total number of people in the room or zone. If ☐ Allow Fractional People is unchecked in the Project Info command, this value will be rounded to the nearest whole person.

  For rooms, set using the SF / Person or People fields in the People section of the Edit Rooms or Room Project Schedule command.

  For zones, set using the SF / Person or People field in the Zone List command. If a value is not specified in these fields, the number of people is the sum of the people in the rooms in the zone.

•  Supply CFM (V_st) The supply airflow required to condition the room or zone. This value is the same as the Required Supply CFM column in the Supply Air Requirements table in the Print Supply Air Requirements section.

•  Uncorrected OSA, CFM (V_on) The ventilation airflow for the room or zone based upon the settings in the rooms and room schedule.

  For rooms, set using the Cooling 1 and Cooling 2 fields in the Ventilation section of the Edit Rooms or Room Project Schedule command.

  For zones, the ventilation airflow is the sum of the airflows of the rooms in the zone.

•  Uncorrected OSA, Fraction (X) The fraction of supply air that is outside air. Equal to $Uncorrected\>OSA,\>CFM \over Supply\>CFM$. The room with the highest Uncorrected OSA, Fraction is highlighted in bold.

•  Critical Space OSA, Fraction (Z) The largest Uncorrected OSA, Fraction for the zone. This value is only listed on the zone row.

•  Corrected OSA, CFM (V_ot) The ventilation airflow volume calculated by the 2006 IMC calculation. This value is used to determine the ventilation load for the zone.

•  Corrected OSA, Fraction (Y) The fraction of supply air that is outside air. Equal to $Corrected\>OSA,\>CFM \over Supply\>CFM$.

2009 International Mechanical Code, ASHRAE 62.1-20##

Ventilation Schedule

When the Ventilation Calculation Method ▾ field in the Project Info command is set to 2009 International Mechanical Code, ASHRAE 62.1-2004, ASHRAE 62.1-2007, or ASHRAE 62.1-2010, the Ventilation Schedule table contains sections for the zones in the project. If the whole building is selected to be printed in the Zone or Room to Print ☰ list, then every zone is listed. If specific zones are selected, then only the selected zones are displayed and no sections are displayed.

The calculations are the same for each method. For complete information about how this calculation works and what these values mean, refer to ASHRAE 62.1.

The labels in italics are the names of the variables used in the ASHRAE 62.1-2004, ASHRAE 62.1-2007, and ASHRAE 62.1-2010 calculations.

Each zone is displayed as a separate section in the table. A header with the name of the zone is displayed at the top of each section. The information about the zone is displayed first in the section, followed by information about each room in the zone.

•  System Primary Airflow V_ps The supply airflow required to condition the zone. This value is the same as the Required Supply CFM column in the Supply Air Requirements table in the Print Supply Air Requirements section. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Average Outdoor Air Fraction X_s A calculated value equal to $Uncorrected\>Air\>Intake \over System\>Primary\>Airflow$. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Occupant Diversity D A diversity factor based upon the number of people in the zone. Equal to the People Diversity value set in the Zone List command divided by the total number of people in the rooms in the zone. Defined in ASHRAE 62.1-2004, Equation 6-7, pg 11.

•  Uncorrected Air Intake V_ou The sum of the Zone Outdoor Airflow values for all of the rooms in the zone. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  System Ventilation Efficiency E_v The minimum Zone Ventilation Efficiency value used to calculate the ventilation airflow required in the zone. Defined in ASHRAE 62.1-2004, Equation A-3, pg 20.

•  Outdoor Air Intake V_ot The total ventilation airflow required for the zone. Equal to $Uncorrected\>Air\>Intake \over System\>Ventilation\>Efficiency$. Defined in ASHRAE 62.1-2004, Equation 6-8, pg 11.

•  Zone Air Distribution Effectiveness E_z Set using the Ez field in the Zone List command. A value less than 1 will increase the ventilation required in the zone. Defined in ASHRAE 62.1-2004, Table 6-2, pg 15.

•  Primary Air Fraction to Zone E_p Set using the Ep field in the Zone List command. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Primary Air Fraction to Zone E_r Set using the Er field in the Zone List command. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Fraction of Supply Air to Zone from Outside Zone F_a Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Fraction of Supply Air to Zone from Fully Mixed Primary Air F_b Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Fraction of Outdoor Air to Zone from Outside Zone F_c Defined in ASHRAE 62.1-2004, Definitions, pg 22.

Room Information

The Room Information section lists each room in the zone.

The room with the lowest Zone Ventilation Efficiency is highlighted in bold.

•  Room The rooms in the zone.

•  Room Type Set using the Room Type ▾ field in the Edit Rooms command.

•  People Outdoor Air, Rate R_p The ventilation rate for the room based upon the number of people. A value is displayed if one of the values in the Ventilation section of the Edit Rooms or Room Project Schedule command is set to CFM / Person. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  People Outdoor Air, People P_z The total number of people in the room or zone. If ☐ Allow Fractional People is unchecked in the Project Info command, this value will be rounded to the nearest whole person. Set using the SF / Person or People fields in the People section of the Edit Rooms or Room Project Schedule command. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  People Outdoor Air, Total R_p*P_z The ventilation airflow for the room based upon the number of people. Equal to $People\>Outdoor\>Air,\>Rate \times People\>Outdoor\>Air,\>People$.

•  Area Outdoor Air, Rate R_a The ventilation rate for the room based upon the area of the room. A value is displayed if one of the values in the Ventilation section of the Edit Rooms or Room Project Schedule command is set to CFM / SF. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Area Outdoor Air, Area A_z The area of the room. Set based upon the room boundary inserted on the drawing. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Area Outdoor Air, Total R_a*A_z The ventilation airflow for the room based upon the area of the room. Equal to $Area\>Outdoor\>Air,\>Rate \times Area\>Outdoor\>Air,\>Area$.

•  Breathing Zone Outside Airflow V_bz The ventilation airflow for the room in the breathing zone based upon the number of people and area of the room. Equal to $People\>Outdoor\>Air,\>Total + Area\>Outdoor\>Air,\>Total$. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Zone Outdoor Airflow V_oz The total ventilation airflow required for the room. Equal to $Breathing\>Zone\>Outside\>Airflow \over Zone\>Air\>Distribution\>Effectiveness$. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Zone Discharge Airflow V_dz The supply airflow required to condition the room or zone. This value is the same as the Required Supply CFM column in the Supply Air Requirements table in the Print Supply Air Requirements section. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Discharge Outdoor Air Fraction Z_d The fraction of supply air that is outside air. Equal to $Zone\>Outdoor\>Airflow \over Zone\>Discharge\>Airflow$. Defined in ASHRAE 62.1-2004, Definitions, pg 22.

•  Zone Ventilation Efficiency E_vz "The efficiency with which the system distributes air from the outdoor air intake to the breathing zone in a particular zone." Calculated based upon the other values in the Room Information section. The room with the lowest Zone Ventilation Efficiency is highlighted in bold. Defined in ASHRAE 62.1-2004, Equation A-2-8n, pg 20.