Data Viewer (DView) Incorrectly Labeling Y Axis?

asked 2023-01-16 15:40:15 -0600

desert_sasquatch
11 ●3

updated 2023-01-31 12:14:47 -0600

Aaron Boranian

14155 ●83 ●24 http://bigladdersoftware.com/

I've searched a bit on the forum (keyword "Data Viewer") and not found anything.

I've been using the Data Viewer "hourly," "daily," and "monthly" graphs to help me size my heating and hot water systems. I think the "hourly" data is accurate, as it gives me a result in about the ballpark I'd expect for a home of that size. It's measured in total kBTU, and since the graph is in intervals of 1 hour that means it's actually total kBTU per hour.

The issue is with the daily and monthly graphs: It also claims that the units are total kBTU, in this case per day or per month. However those numbers appear to actually be average hourly kBTU per day or per month--because how else would the coldest day of the year give me about 27 kBTU/hr of peak use but only 14.5 kBTU of use in total?

I guess I just want to see if I'm missing something, or if this is, indeed a known misstatement. And if so, if I'm right in thinking that those graphs should be reading Average kBTU/hr.

Edit: Here are the graphs.

image description

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@desert_sasquatch you should have enough karma points now to upload an image to your post. You can also save images on a service like Imgur, Dropbox, etc. and share the URL to those in your post.

Aaron Boranian ( 2023-01-17 14:34:45 -0600 )edit

Thanks Aaron. The images should be up now.

desert_sasquatch ( 2023-01-17 14:53:21 -0600 )edit

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answered 2023-01-31 09:57:14 -0600

shorowit

11891 ●201 ●9 https://www.nrel.gov/b...

DView always defaults to showing averages, whether averaging sub-hourly values for the Hourly tab or averaging hourly values for the Daily/Monthly tabs. (For some variables, like temperatures, it would be fairly meaningless to show sums rather than averages.) As DView is general purpose software tool and simply displays the data it is provided, it doesn't really know what the data means/represents, so it would be difficult to automatically change the provided units (e.g., kBtu) for different displays.

If you click on the Wrench button in the lower-right hand corner of a given timeseries display, you can choose to have DView show sums instead of averages. You may need to re-select a variable to have it display correctly.