Response to: Three Simple Rules for Mechanical HVAC Design

Recently I’ve stumbled upon a blog post at Autocad’s that made me rage hard. You should read it: Three Simple Rules for Mechanical HVAC Design.

What’s wrong with it you ask? Let me explain…

“The problem today is that HVAC systems are usually designed by mechanical engineers1 and typically account for 30% or more of a building’s total energy use.” I didn’t check his numbers, so we’ll hope he’s right on this one. Why would 30% of a building’s total energy use be a problem? God, I hope it’s at least 30%, otherwise you have some big problem elsewhere. The HVAC system heats, cools, brings new air so you don’t choke to death. (Granted, worse case scenario would probably be a bad headache.) The biggest expenses for a building sure isn’t the lighting! Neither the power needed for the computers. (Which adds to the building ventilation load by the way. More computer = more cooling needed).

Three simple rules?

“…without further ado, here are three simple rules to keep in mind when designing for mechanical HVAC systems:

  1. Don’t oversize the system
  2. Choose efficient components
  3. Design passive and mechanical systems to work together”

Don’t oversize the system

No shit! Better call back the guys! “Guys, he solved it! You can go back to your loved ones!”

How about don’t under-size the system? Yeah, that too would be a good advice.

Oh! Oh! I also have the secret for eternal life! It’s really simple: don’t die.

Choose efficient components

Really? REALLY?? Efficiency usually comes with a price. The best solution sometimes requires to select the second or third most efficient, simply because the return on investment of choosing the last-hippie-trendy-efficient-system wouldn’t be worth it.

Design passive and mechanical systems to work together

Fuck you.

Footnotes:

1 I have my own grudge against engineers, so I won’t take him on this one.


4 responses to “Response to: Three Simple Rules for Mechanical HVAC Design

  • gabgoss

    Design passive and mechanical systems to work together
    Fuck you.

    Peux tu développer?

    • Frozenlock

      Bien-sûr. C’est tellement évident que juste le fait que ce soit un “conseil” est insultant.

      C’est l’équivalent de dire “Hey, il ne faut pas respirer en même temps que boire!”

  • Tomoko

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    enormous post at at this place.

  • Mellissa

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    Whenever I take a look at your blog in Safari, it looks fine however, if opening in I.
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