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eQUEST prompts us when the stimulation is complete. Here we are going to select the summary results or reports. There are several comparison reports and single run reports, as well as parametric run reports, that we discussed earlier in the introduction. In this case, we're going to look at the reports in more detail. Here, if we start by looking at the comparison report, we have the monthly total energy consumption.
The main parameter change between these two runs is there is a variable volume fan in the second run, therefore, we see the greatest savings in the winter months when the air flows are much lower in the variable volume system. Here we can look at the electric consumption, in terms of kilowatt hours.
The next report is simply the annual utility bills that are broken up by rate structure. Please note that the only form of gas consumed in this project is by the small amount of domestic hot water. Therefore, we see primarily electric cost. Perhaps a better report to look at, or at least more detailed, is the monthly utility bills where we can see the costs month to month.
If we want to look into even more detail, we can look at the energy by end use. In this case, we can see the primary savings is the ventilation which includes the ventilation fans or the supply fans. We can see that run two uses more energy, in terms of space heating, and this is because of the VAV reheat boxes-- when the boxes are at their minimum stops. To continue, we can look at the annual electric use by run and enduse. Again, we can see the main savings is the ventilation fans and we can see, though much less clearly since it's a smaller number, that the space heating is slightly greater in the second run. Finally, we get to the life cycle cost analysis.
Here eQUEST breaks down our numbers and we can see the first year payback, as well as the total life cycle cost. eQUEST breaks down the numbers and we can see our total first year expenses, as well as our total life cycle cost. It also gives us an adjusted internal rate of return, the simple payback, and the discounted payback. Please note that the discounted payback relies heavily on the project parameters we entered earlier. A neat graph that is shown shows us the cumulative net savings as time progresses. This uses the timed value of money, and therefore the intersection of the line here is the point when the project pays back at 9.8 years. Beyond that, the project continues to pay back and accumulative savings increases. We can also look at the individual details in the life cycle savings comparisons. Basically, this is just simple graphs that show us the savings, the adjusted internal rate of return, the simple payback, and the discounted payback. Next, we can look at the single run reports.
Starting with the monthly energy consumption by enduse, we can look in greater detail at each of the runs. Please note that we can distinguish the different runs by going to the projects/runs tab and selecting the appropriate run. In this case we're looking at run number two, but to switch to the baseline we simply click baseline design. These reports are relatively self-explanatory. An interesting report is the monthly electric peak day. In this case, eQUEST considers the 12 months of the year and it displays the load profile for the peak load day. Illustrated in red is the heating peak and illustrated in blue is the cooling peak. Users may only see January-June, however, we must note that there is another page and we can click to the next page and view July-December. These profiles are useful as they break down the individual load components. This is helpful when trouble shooting size differences in equipment as you can visually detect any major sources of load. For instance, we can clearly see that the largest source of load during the cooling days is yellow, which indicates the area lighting. While these reports are helpful, users often require more detailed reports. In such cases when more detailed results are needed, users may go to the tools menu and select view stimulation output. In this case, a window is going to be displayed for each run. So it's often desirable to simply select one report, and in this case we'll leave two selected to illustrate the multiple windows.
Here we select open and we will be prompted with the D2SimViewer. Please note we have two windows and each window represents it's corresponding stimulation run. The respective runs can be determined by looking at the title of the window. Here we have the baseline design stimulation and here we have the whole building energy efficiency measure, in this case, where we added the VAV system. If you used the scroll bar, you can scroll through the multiple reports or you can look through the reports explicitly. It takes some time, but the reports are laid out such that the summary reports are listed first, followed by the hourly reports. As you can see, there are hundreds of pages of reports, so one must familiarize themselves with the D2SimViewer. One helpful feature is to use control+F, or the find function. For instance, if we wanted to find the CFM of the certain value, we can click find. Make sure that the case isn't set to match because these reports use many capitalized letters. So you can search through these reports to try to find, in this case, the supply flow.
In certain reports, there's a component feature listed and this breaks it down by the individual components, in this case, by the individual zones. Finally there's an hourly results button, when clicked, opens Excel. In this case, it gives us 8,760 data points of individual variables, such as heating and use energy and heating and cooling energy, along with heat rejection, and so on. We won't explore this further at this time, so in summary, it's important to note that there are two windows and that the runs are not displayed side by side, but rather in separate windows. It's also important to note that the reports here simply get you to the correct page number. You could easily access any of the reports by simply scrolling, though I would recommend using the report drop down menu. And finally, don't forget that there's multiple components and these reports exist for each one of these components when listed. In reality, for any project, it's unlikely that you will ever look at all of these reports, so you'll end up with the reports that you use more than others. It is up to the user to define which of these reports works best for them, though the first several reports are used by most users. It's also a good idea to start with the comparison reports and start your trouble-shooting from the simplest level.
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