Residential Steam Boiler Control - Update

Any other Phidget projects you've done not related to the above subjects
MarkS
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Residential Steam Boiler Control - Update

Postby MarkS » Sat Apr 20, 2013 12:29 pm

I've spent the last several months re-writing the boiler control software that I described here back in September to run in Java on an SBC2. This past week I converted from oil to gas and installed a new Midco LNB-500 modulating gas burner. This is a commercial unit that usually goes into automotive spray paint booths, and was recently qualified for use on residential steam boilers. My objective is to modulate the burner based on steam pressure in the boiler, so that steam production is in balance with the steam condensation rate in the radiators.

I used a Phidgets 1002 Analog Output to control the modulating voltage to the burner (2-10 vdc) and wrote PID algorithms for the SBC to drive the analog ouput based on steam pressure (0-48 oz/in2 pressure transmitter on a Phidgets 1132 4-20 ma Adapter) or stack temperature (Phidgets 1051 Thermocouple board).

I've made extensive use of the Phidgets Dictionary as the communications interface between the server app running on the SBC2 and the user interface on a PC. The server app is autonomous; it will continue to operate in the absence of a user interface or network connection, or if the Phidgets Webservice is not running on the SBC.

Here are links to three YouTube videos of the system in operation:

http://tinyurl.com/c988e6m
http://tinyurl.com/cszucxb
http://tinyurl.com/cl9sg5k

And here are some pics of the control cabinet and user interface:

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Link: EcoSteam - Residential Steam Boiler Control using Phidgets
"Bringing 21st century automation to a 19th century home"

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