Wednesday, March 27, 2013

March Madness

Wow! It’s almost the end of March, can you believe it?! I have been to Philadelphia and Springfield Missouri ASHRAE Chapters, as well as a week in Florida with the motorcycle for bike week. We just had an all-day training session for Texas engineers yesterday at our facility (subject being “Basics of Air Distribution”). I also did a 30 minute webinar on the “Basics of Air Distribution” a couple of weeks ago, which is recorded and available on the Krueger website. I will be doing a webinar on the “Application of Dedicated Outdoor Air Systems” on April 10, and a two part webinar on the “Methods of Effective Air Distribution” in May, which was a two part ASHRAE Journal article in November and December, last year. We are certainly getting a lot of stuff in front of engineers, which is hopefully of some use.

I’ll be traveling to Montreal in Late April to chat with the NEBB (air balancers) at their national meeting. You may be assured I’ll speak to the issue of adjusting slot diffusers. I had one contractor at the training session yesterday say that they added 10 minutes to the install time for slots to allow for adjustment in coordination with the air balancers. This is excellent input, but sadly the first time I had heard of it. I asked why they did it, and was told it was in response to complaints from older projects of drafts. I’m glad someone is listening to occupant complaints. I think this is a key issue for both designers and installers: Listen to the occupants!

I was told by an engineer in North Carolina that he had been installing overhead heating at over 100°F for years and no one had complained. I have to conclude that what he meant was that no one had complained to him. In the 1000+ air distribution tests we conducted back in the late 1970’s, there was not a single test with discharge temperatures that high which met , or even came close to meeting ASHRAE Standard 55’s vertical temperature stratification limit of 5.4°F. BOMA continues to report that the number one reason for not renewing the lease in a high rise building is occupant dissatisfaction with the environment. I said it once (actually many times!) and I’ll say it again: Listen to the occupants!

Authored by: Dan Int-Hout, Chief Engineer Krueger