This section deals with setting up a design day simulation for sizing the cooling capacity. The design day simulation works by running the design day for the number of user-defined repetitions using the day type to define which internal conditions are used and a days data from a weather file for the external conditions. Once it has run that design day it then continues onto the next one in the design day list which will have a different set of internal and external conditions.
The Design Days table lists the different design days that will used in the design day simulation. There is one design day called "Cooling Design Day" already in the table. The design day list box has a set of buttons directly above it:
Button |
Keyboard Shortcut |
Description |
New |
Insert |
Adds a new design day to the bottom of the list. Once you have clicked on this button, type in the name and press <return> |
Delete |
Delete |
Deletes the selected design day |
Move Up |
Alt + Up arrow |
Moves the selected design day up one position in the list |
Move Down |
Alt + Down arrow |
Moves the selected design day down one position in the list |
To select a design day, left click on its name. To change the name of a design day, double left-click on its name. You must have at least one design day to be able to run the design day simulation.
For each design day, the following parameters must be set:
Description: the user may input details about the design day.
Repetitions: the number of times the design day simulation will run this design day. If this value is set to zero, the simulation will run until it can size the plant capacity.
Year Day: This is used to calculate the sun position. The sun position is a function of the time and the weather file's geographical position.
Day Type: The day type assigned to the selected design day. Day types are created in the following section: Calendar.
The design day window also contains a graphical tab and tabular tab for the weather information. The user should copy a day's worth data from a weather file into the weather table. The tabs are described in the sections weather file -graphical and weather- tabular.