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:
- Don’t oversize the system
- Choose efficient components
- 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
1 I have my own grudge against engineers, so I won’t take him on this one.