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DIY Zoning: 7 Years Down The Road

A comprehensive guide to creating a DIY temperature zoning system, covering sensor networks, data acquisition, visualization, dampers, core logic, and more.

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DIY Zoning: 7 Years Down The Road

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  1. DIY Zoning: 7 Years Down The Road Vadim Tkachenko

  2. Before we start: questions • Write notes and pass them up so there's a chance to answer them in depth later, online • Forgot to ask? Not a problem – send it to the mailing list

  3. Introduction

  4. Introduction • What DZ is? • A Knowledge Base • A Temperature Zoning System

  5. Introduction • What DZ is? • A Knowledge Base • A Temperature Zoning System • What DZ is not? • Can't buy • Can't pay anyone to make for you (yet)‏

  6. Gestation

  7. Gestation • Iowa house built in 1849 with no A/C • Arizona tri-level – scorching upstairs, freezing downstairs

  8. Gestation • Iowa house built in 1849 with no A/C • Arizona tri-level – scorching upstairs, freezing downstairs • Existing solutions: dumb systems, lying salespeople, incompetent consultants

  9. Gestation • Iowa house built in 1849 with no A/C • Arizona tri-level – scorching upstairs, freezing downstairs • Existing solutions: dumb systems, lying salespeople, incompetent consultants • Last straw: “You're too $^&* smart, we're not gonna do business with you”

  10. Inception

  11. Inception • What one can't buy, one has to make • KISS and cheap • Proper way to eat the elephant: one bite at a time • Therefore, “The Seven Steps”

  12. Technicalities

  13. Technicalities • Step 1: Sensor Network • Cheap: $3 1-Wire sensors • Distributed • Autoconfiguration, capabilities discovery • Heterogeneous

  14. Technicalities • Step 1: Sensor Network • Cheap: $3 1-Wire sensors • Distributed • Autoconfiguration, capabilities discovery • Heterogeneous • Step 2: Data Acquisition • rrdtool, xAP, xPL, generic broadcast

  15. Technicalities • Step 3: Visualization • Too many ways • You'd be surprised • Long term trends important • Stop, think, fix obvious problems

  16. Technicalities • Step 4: Dampers • R/C Servos • Cheap • “Worse Is Better”

  17. Technicalities • Step 5: Core Logic • Container architecture • Unlimited zones • Arbitrarily complex schedules • Pluggable control strategies

  18. Technicalities • Step 6: Passive Mode • No need to fiddle with HVAC • May just work for you • Gets insurance off your back

  19. Technicalities • Step 7: Total Control • STOP! • Abandon hope, all ye who enter here • You must understand the consequences • They will be after you if something goes wrong

  20. Technicalities • Beyond • All kinds of sensors, not just temperature • Fault tolerance: can of worms • Home automation integration • Remote access • Family friendly controls

  21. Denial

  22. Denial • HVAC contractors: “This is more complicated than rocket science” • Not really, but close enough

  23. Denial • HVAC contractors: “This is more complicated than rocket science” • Not really, but close enough • “Get out of our business and stay out” • I don't think so

  24. Denial • HVAC contractors: “This is more complicated than rocket science” • Not really, but close enough • “Get out of our business and stay out” • I don't think so • It is too complicated for them, too

  25. Acceptance

  26. Acceptance • Top link on Google for “temperature zoning” • Ahead of Honeywell, Carrier, Trane, Arzel Zoning and others (they do this for living)‏ • Respected by HVAC contractors • http://hvac-talk.com/vbb/showthread.php?t=141295&page=2

  27. Side Effects • You can be sure you did something good when it turns out you've been ripped off • Imitation, flattery, Honeywell thermostats

  28. Side Effects • You can be sure you did something good when it turns out you've been ripped off • Imitation, flattery, Honeywell thermostats • They still haven't called

  29. Side Effects • You can be sure you did something good when it turns out you've been ripped off • Imitation, flattery, Honeywell thermostats • They still haven't called • Big, bad wolf out there

  30. Side Effects • You can be sure you did something good when it turns out you've been ripped off • Imitation, flattery, Honeywell thermostats • They still haven't called • Big, bad wolf out there • Chilling effect: most of research is private now

  31. Maturity

  32. Maturity • Monolithic became modular • Centralized became distributed • “Do all things poorly” became “do one thing, do it good”, many times over • “Need to know what great ideas to discard” • Interoperability is the key • Change of focus: Now that we've taken care of your sinusitis...

  33. Enterprise Ramifications

  34. Enterprise Ramifications • Parallel semantics perfected • Distributed semantics uncovered • Fault tolerance is most stringent • There is no such thing as too much monitoring • JMX instrumentation helps • Long term trends important: visualize! • Component model and pattern reuse

  35. DIY Zoning http://diy-zoning.sourceforge.net/ http://diy-zoning.blogspot.com/ Google search “temperature zoning” Questions?

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