Design Day
 
  1 Home
  2 Objective
  3 Installation
  4 The problem
  5 Problem - Details
  6 Start IDF editor
  7 Add Version
  8 Building Object
  9 Time Step
10 Run Control
11 Location
12 Design Day
13 Material Regular
14 Construction
15 Zone
16 Surface Geometry
17 Surface Heat Transfer
18 Schedule Type
19 Schedule Compact
20 Controlled Zone Equip Config
21 Zone Equipment List
22 Purchased Air
23 Zone Control Thermostatic
24 Dual Setpoint with Deadband
25 Report Variable
26 Report Meter
27 Report
28 Start EP launch
29 Select the IDF file
30 During Simulation Run
31 Run Status
32 Click DXF
33 Drawing in VoloView
34 Click Orbit button
35 3D view of the Drawing
36 Output data in Excel

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Some Inforamtion from the Input Output Reference

DesignDay

The design day input describes the parameters to effect a “design day” simulation, often used for load calculations or sizing equipment. Using the values in these fields, EnergyPlus “creates” a complete day’s worth of weather data (air temperatures, solar radiation, etc.)

Field: DesignDayName
This field, like Location, is used simply for reporting and identification. This name must be unique among the Design Days entered.

Field: Maximum Dry-Bulb Temperature
This numeric field should contain the day’s maximum dry bulb temperature in degrees Celsius.

Field: Daily Temperature Range
A design day can have a “high” temperature and a “low” temperature (or can be a constant temperature for each hour of the day). If there is a difference between high and low temperatures, this field should contain the difference from the high to the low. EnergyPlus, by default, distributes this range over the 24 hours in the day.

Field: Humidity Indicating Conditions at Max Dry-Bulb
This numeric field represents the “humidity indicating” conditions that are coincident with the maximum temperature for the day. The value in this field is indicated by the key value in the field Humidity Indicating Type. This numeric value, along with the Maximum Dry Bulb Temperature and Barometric Pressure, is used to determine a humidity ratio and then used to calculate relative humidity, wet-bulb and dew-point temperatures at each timestep.

Field: Barometric Pressure
This numeric field is the constant barometric pressure (Pascals) for the entire day.

Field: Wind Speed
This numeric field is the wind speed in meters/second (constant throughout the day) for the day.

Field: Wind Direction
This numeric field is the source wind direction in degrees. By convention, winds from the North would have a value of 0., from the East a value of 90.

Field: Sky Clearness
This value represents the “clearness” value for the day. This value, along with the solar position as defined by the Location information and the date entered for the design day, help define the solar radiation values for each hour of the day. Traditionally, one uses 0.0 clearness for Winter Design Days.

Field: Rain Indicator
This numeric field indicates whether or not the building surfaces are wet. If the value is 1, then it is assumed that the building surfaces are wet. Wet surfaces may change the conduction of heat through the surface.

Field: Snow Indicator
This numeric field indicates whether or not there is snow on the ground. If the value is 1, then it is assumed there is snow on the ground. Snow on the ground changes the ground reflectance properties.

Field: Day Of Month
This numeric field specifies the day of the month. That, in conjunction with the month and location information, determines the current solar position and solar radiation values for each hour of the day.

Field: Month
This numeric field specifies the month. That, in conjunction with the day of the month and location information, determines the current solar position and solar radiation values for each hour of the day.

Field: Day Type
This alpha field specifies the day type for the design day. This value indicates which day profile to use in schedules.

Field: Daylight Saving Time Indicator
This numeric field specifies whether to consider this day to be a “Daylight Saving Day”. This essentially adds 1 hour to the scheduling times used in items with schedules.

Field: Humidity Indicating Type
Valid choices here are: Wet-Bulb, Dew-Point, Humidity-Ratio, Enthalpy, Schedule. Units for the first four choices are Celsius, Celsius, ratio of kg wet air/kg dry air (no units), and kJ/kg. Using one of these choices means that you then put an appropriate value in the “Humidity Indicating Conditions at Max Dry-Bulb” field. The Schedule choice uses the “day schedule” indicated in the next field. That is, if you want to specify your own relative humidity to occur throughout the day, you put “schedule” in here and put in the name of your “day schedule” that specifies the relative humidity in the “Relative Humidity Day Schedule”.

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