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The variable flow primary secondary design evolved as a way to allow the flow rate to the loads to vary with the load profile, saving a significant amount of pump energy, while maintaining a steady flow rate through the chillers, which protected them. But you ended up with large pumps moving the design flow rate at the design head for all of the operating hours.

Gitize hundred graph engauge digitizer driver#

In fact, in the olden days, before we had realized that we needed to pay attention to energy efficiency, the most common chilled water plant design configuration was a constant flow arrangement and a big driver for that was protecting the chiller tube bundles from frosting up and freezing. Unlike current technology chillers, back when this plant was designed, the chiller technology would not deal well with flow variation in the evaporator. The plant was a variable flow primary/secondary plant. It was a 9,000 ton plant one of the largest I have been around for a while. (And still called that by older folks like me who forget they changed the name). Last October, I had the opportunity to support a field class that used the central chilled water plant at the Gaylord Grand OleвЂ™ Opry as a part of the Building Commissioning Association Annual Conference (formerly called the National Conference on Building Commissioning or NCBC). Using Plot Digitizer to Generate Trend Data from a Graphic.Each section has a Back to Contents link that brings you back here. But if you want to jump straight to that, the links below will let you do that (or jump to any of the other topics for that matter). There were two cool features in the plant I will be discussing that I wanted to highlight in addition to illustrating my new Plot Digitizer application. Since it happened while I was working at a really interesting chilled water plant that had some unique features, I thought I would give you a peak at those things also. My goal in this post is to show you an idea that came to me one day out in the field that saved the day for me and involved using plot digitizer in a way I had not thought of before. This link will take you to a page on our commissioning resources web site where I provide more information, and this link will take you to a page where I provide a spreadsheet template that will let you create a formatted pump curve pretty easily from the CSV files you capture with plot digitizer. or you can plot a system curve from the data you collect in a pump test and the square law. For instance, you can use the affinity laws to project a new impeller size from a know impeller size. Once the curve is in the form of a spreadsheet. jpg file, then you can pretty quickly capture the curve shapes and load them into a spreadsheet to create a chart that is an electronic version of the curve. Meaning that if you have, for instance, a pump curve as a. If you are unfamiliar with it, the application allows to to create CSV (Comma Separated Value) files from the lines in an image. Terribly disappointing - I'd really like to try this.Those of you who know me know I am quite enamored with a little freeware application called Plot Digitizer. And two versions should ALWAYS be offered: The full, whiz-bang propeller head version, and the minimal bombproof exectuable.

Gitize hundred graph engauge digitizer install#

Or at least should state 'You need to download and install the following packages for this program to work'.

Gitize hundred graph engauge digitizer software#

In general, I think software on sourceforge, if offered in compiled form, should be statically linked, or should have the needed. And I'd have to spend an hour running that down. Or I'd get a message that I had the wrong gcc (or whatever compiler), or that I need a whole new raft of dlls and packages to run the compiler. But I've already wasted an hour trying to get it to work, and I'm thinking that even if I could install the programming package that has mscvp100d.dll, I'd get another message stating 'Can't run because your system does not have obscure_mysterious.dll'. I can't give any positive marks to software that is released in an unusable form.

There may be folks that are a few developers that have a QT and debugger installed, but this misses most potential users. In andy case, the software, as released, is absolutely useless for most people. I don't do much coding, and so don't have gcc installed. Further, when one does this, one gets a 'Missing MSCVP100D.dll' message, indicating (I believe) that the project was compiled using /debug instead of /release.

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And so a small, efficient code is turned to bloatware. So one must download that project (1.26 GIGAbytes, by the way).

Gitize hundred graph engauge digitizer download for windows#

Not trying to run this project down, but there are a bunch of notes in various spots on the web testifying that this download for Windows (5_1) is missing a bunch of the.