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Web-Based Energy Performance Analysis Tools
XY Crossplots
The x-y plot shown in Figure 3 shows System Efficiency kW/ton vs.
Chiller Tons.
Note: The current software gives three "preset"
x-y plots. The
data points corresponding to the selected graph should be active upon opening
the utility. If you change the points viewed, your changes will be saved
(if you login again from the same IP address), and you will need to re-activate
the original points in order to view them. This has been a point of confusion
for some viewers - when you open the plots for the first time, the correct
points should be displayed; however, if you select different points to
view, those points will be displayed though the heading and/or axes may
be incorrect.
To display an x-y plot, select any plot listed under "XY
Cross Plot."
The next screen has four panels.
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Select a folder. If you are not sure which folder to look at, go to the
Point Name Reference. The headings correspond
to folders (AHU, CHILLER1, CHILLER2, CTOWER, POWERS, PUMPS, SYSTEM, WEATHER,
& STAT_PRES).
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When you select a folder, the points in that folder will be displayed in
panel 2. Select one or more points. You can return to panel 1 if you wish
to load points from another folder as well, or continue to panel 3.
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The points selected in panel 2 are displayed here. If you login again from
the same IP address, the points you viewed last time will be displayed
here, and thus you could skip panels 1 and 2 if you wanted to view the
same points again. You can select points and delete them from your list
as well.
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The points displayed in panel 3 will be redisplayed here; select one point
for the x-axis and one for the y-axis. As a default, the first point selected
will be x and the second, y. Click OK to display the graph.
Figure 3. System Efficiency kW/ton vs. tons
Navigation:
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Limits. You may change the limits by typing in the text entry boxes.
Click OK to change limits for this session or click Save Limits to save
for future sessions.
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Date. The default date is the current day, up to the current time.
Use the calendar to select a different day.
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Box and Zoom. Select a box with the cursor and zoom in on important
data. Press "r" to return to original scale.
Back
: Time Series
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