SIZINGPERIOD:DESIGNDAY

The design day object creates the parameters for the program to create the 24 hour weather profile that can be used for sizing as well as running to test the other simulation parameters. Parameters in this include a date (month and day), a day type (which uses the appropriate schedules for either sizing or simple tests), min/max temperatures, wind speeds, and solar radiation values.

Name

Type: alphanumeric

Month

Type: integer
Minimum: 1
Maximum: 12

Day of Month

Type: integer
Must be valid for Month field
Minimum: 1
Maximum: 31

Day Type

Type: choice (Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Holiday, SummerDesignDay, WinterDesignDay, CustomDay1 or CustomDay2)
Day Type selects the schedules appropriate for this design day

Maximum Dry-Bulb Temperature

Type: real number
This field is required when field "Dry-Bulb Temperature Range Modifier Type" is not "TemperatureProfileSchedule".
Unit: C
Minimum: -90
Maximum: 70

Daily Dry-Bulb Temperature Range

Type: real number
Must still produce appropriate maximum dry-bulb (within range) This field is not needed if Dry-Bulb Temperature Range Modifier Type is "delta".
Unit: deltaC
Minimum: 0
Default: 0

Dry-Bulb Temperature Range Modifier Type

Type: choice (MultiplierSchedule, DifferenceSchedule, TemperatureProfileSchedule or DefaultMultipliers)
Type of modifier to the dry-bulb temperature calculated for the timestep
Default: DefaultMultipliers

Dry-Bulb Temperature Range Modifier Day Schedule Name

Type: list of objects (SCHEDULE:DAY:INTERVAL, SCHEDULE:DAY:HOURLY or SCHEDULE:DAY:LIST)
Only used when previous field is "MultiplierSchedule", "DifferenceSchedule" or "TemperatureProfileSchedule". For type "MultiplierSchedule" the hour/time interval values should specify the fraction (0-1) of the dry-bulb temperature range to be subtracted from the maximum dry-bulb temperature for each timestep in the day For type "DifferenceSchedule" the values should specify a number to be subtracted from the maximum dry-bulb temperature for each timestep in the day. Note that numbers in the difference schedule cannot be negative as that would result in a higher maximum than the maximum previously specified. For type "TemperatureProfileSchedule" the values should specify the actual dry-bulb temperature for each timestep in the day.

Humidity Condition Type

Type: choice (WetBulb, DewPoint, HumidityRatio, Enthalpy, RelativeHumiditySchedule, WetBulbProfileMultiplierSchedule, WetBulbProfileDifferenceSchedule or WetBulbProfileDefaultMultipliers)
Values/schedules indicated here and in subsequent fields create the humidity values in the 24 hour design day conditions profile.
Default: WetBulb

Wetbulb or DewPoint at Maximum Dry-Bulb

Type: real number
Wetbulb or dewpoint temperature coincident with the maximum temperature. Required only if field Humidity Condition Type is "Wetbulb", "Dewpoint", "WetBulbProfileMultiplierSchedule", "WetBulbProfileDifferenceSchedule", or "WetBulbProfileDefaultMultipliers"
Unit: C

Humidity Condition Day Schedule Name

Type: list of objects (SCHEDULE:DAY:INTERVAL, SCHEDULE:DAY:HOURLY or SCHEDULE:DAY:LIST)
Only used when Humidity Condition Type is "RelativeHumiditySchedule", "WetBulbProfileMultiplierSchedule", or "WetBulbProfileDifferenceSchedule" For type "RelativeHumiditySchedule", the hour/time interval values should specify relative humidity (percent) from 0.0 to 100.0. For type "WetBulbProfileMultiplierSchedule" the hour/time interval values should specify the fraction (0-1) of the wet-bulb temperature range to be subtracted from the maximum wet-bulb temperature for each timestep in the day (units = Fraction) For type "WetBulbProfileDifferenceSchedule" the values should specify a number to be subtracted from the maximum wet-bulb temperature for each timestep in the day. (units = deltaC)

Humidity Ratio at Maximum Dry-Bulb

Type: real number
Humidity ratio coincident with the maximum temperature (constant humidity ratio throughout day). Required only if field Humidity Condition Type is "HumidityRatio".
Unit: kgWater/kgDryAir

Enthalpy at Maximum Dry-Bulb

Type: real number
Enthalpy coincident with the maximum temperature. Required only if field Humidity Condition Type is "Enthalpy".
Unit: J/kg

Daily Wet-Bulb Temperature Range

Required only if Humidity Condition Type = "WetbulbProfileMultiplierSchedule" or "WetBulbProfileDefaultMultipliers"
Unit: deltaC

Barometric Pressure

Type: real number
This field's value is also checked against the calculated "standard barometric pressure" for the location. If out of range (>10%) or blank, then is replaced by standard value.
Unit: Pa
Minimum: 31000
Maximum: 120000

Wind Speed

Type: real number
Unit: m/s
Minimum: 0
Maximum: 40

Wind Direction

Type: real number
North=0.0 East=90.0 0 and 360 are the same direction.
Unit: deg
Minimum: 0
Maximum: 360

Rain Indicator

Type: choice (Yes or No)
Yes is raining (all day), No is not raining
Default: No

Snow Indicator

Type: choice (Yes or No)
Yes is Snow on Ground, No is no Snow on Ground
Default: No

Daylight Saving Time Indicator

Type: choice (Yes or No)
Yes -- use schedules modified for Daylight Saving Time Schedules. No - do not use schedules modified for Daylight Saving Time Schedules
Default: No

Solar Model Indicator

Type: choice (ASHRAEClearSky, ZhangHuang, Schedule, ASHRAETau or ASHRAETau2017)
Default: ASHRAEClearSky

Beam Solar Day Schedule Name

Type: list of objects (SCHEDULE:DAY:INTERVAL, SCHEDULE:DAY:HOURLY or SCHEDULE:DAY:LIST)
If Solar Model Indicator = Schedule, then beam schedule name (for day)

Diffuse Solar Day Schedule Name

Type: list of objects (SCHEDULE:DAY:INTERVAL, SCHEDULE:DAY:HOURLY or SCHEDULE:DAY:LIST)
If Solar Model Indicator = Schedule, then diffuse schedule name (for day)

ASHRAE Clear Sky Optical Depth for Beam Irradiance (taub)

Required if Solar Model Indicator = ASHRAETau or ASHRAETau2017 ASHRAETau2017 solar model can be used with 2013 and 2017 HOF matching taub
Unit: dimensionless
Minimum: 0
Maximum: 1.2
Default: 0

ASHRAE Clear Sky Optical Depth for Diffuse Irradiance (taud)

Required if Solar Model Indicator = ASHRAETau or ASHRAETau2017 ASHRAETau2017 solar model can be used with 2013 and 2017 HOF matching taud
Unit: dimensionless
Minimum: 0
Maximum: 3
Default: 0

Sky Clearness

Type: real number
Used if Sky Model Indicator = ASHRAEClearSky or ZhangHuang 0.0 is totally unclear, 1.0 is totally clear
Minimum: 0.0
Maximum: 1.2
Default: 0.0

Maximum Number Warmup Days

Type: integer
If used this design day will be run with a custom limit on the maximum number of days that are repeated for warmup. Limiting the number of warmup days can improve run time.

Begin Environment Reset Mode

Type: choice (FullResetAtBeginEnvironment or SuppressAllBeginEnvironmentResets)
If used this can control if you want the thermal history to be reset at the beginning of the design day. When using a series of similiar design days, this field can be used to retain warmup state from the previous design day.
Default: FullResetAtBeginEnvironment