Monday, January 21, 2013

Top Ten HVAC Predictions for 2013

The long awaited Top Ten HVAC Predictions for 2013.

Let’s hope I can do better than I did in 2012.

1. LEED 2013 will be released in the fall and it will include a reference to AHRI 885 to prove compliance to acoustical requirements.

2. Balancers will continue to ignore the need to adjust linear diffusers before balancing. If adjusted after balancing, rebalancing is required. This is the design engineer’s responsibility, of course, so they need to require adjustment if they specify adjustable slots. I predict this will be ignored. (It’ll be an easy 10 points).

3. ASHRAE Thermal Comfort Standard (55-2010) will be modified to include Normative (mandatory) and Informative sections so that it can be referenced directly in codes. This is already partly accomplished. ADPI will be included in ASHRAE standard 55 as a means of predicting compliance.

4. The updated ASHRAE UFAD Design Guide will be published in 2013.

5. We will see no published, peer reviewed, energy savings data for any of the “new” systems (displacement, underfloor, or chilled beams), but engineers will continue to claim energy savings compared to overhead systems to get LEED or Energy Star ratings.

6. BOMA will continue to state that the #1 reason for not renewing the lease in high rise buildings is “occupant dissatisfaction with the building environment” (ie: comfort). (It has been for the past 20 years; this is likely a ‘gimmee’.)

7. The market for HVAC components will again be relatively flat with local ups and downs.

8. VAV overhead air distribution will continue to be (by far) the most used system in new buildings. As loads decrease, it will become more apparent that the ventilation load in the interior is the predominant building load. ASHRAE RP 1515 will open a lot of eyes.

9. The majority of VAV box schedules will continue to show design discharge temperatures in excess of 90ºF, in spite of the ASHRAE handbook stating this will guarantee non-compliance to Standard 55’s vertical temperature stratification limitation - and without compensating increases in ventilation, as required by Standard 62.1 (and code in most states).

10. Sadly, the Cowboys will continue to disappoint their fans. (Again)

Authored by: Dan Int-Hout, Chief Engineer Krueger

Dan Int-Hout's Prediction Assessment for 2012

As I did last year, here is my self-assessment on the 2012 predictions.

1. LEED 2012 will be released in the fall and it will result in a number of changes in the way building HVAC systems are designed, both for energy savings and acoustics. – Oops, it was delayed a year: 0 points.

2. The ASA Classroom acoustics recommendation (essentially NC = 26, ANSI 12.60) will become a default requirement for new classroom design. The LEED prerequisite will require that either the ASHRAE handbook or AHRI 885 will be designated as a primary method of estimating sound levels in schools and other places as well; Engineers will discover that the 885 spreadsheet is a much easier approach.- Real slow acceptance. 5 points

3. ASHRAE Thermal Comfort Standard (55-2010) will include mandatory language only for the calculations employed. A set of default compliance paths will be developed and put out for public review. - It’s happening, and is in progress: 6 points

4. The updated ASHRAE UFAD Design Guide will come out of committee at the summer meeting. – We vote on it in Dallas: 10 points

5. Displacement Ventilation will continue to see significant use in classrooms due to its low sound generation. – Yup: 10 points

6. Chilled Beams will continue to be used by innovative engineers. While I hope to see some validation of the energy consumption savings, I predict we won’t.- No published energy data yet: 10 points

7. BOMA will continue to state that the #1 reason for not renewing the lease in high rise buildings is “occupant dissatisfaction with the building environment” (ie: comfort). I still see new designs with designed discharge temperatures for overhead systems in excess of 100ºF, which leads to significant stratification.- Sadly, this continues: 10 points

8. The market for HVAC components will again be relatively flat with local ups and downs. – Also sadly, but it is beginning to improve: 7 points

9. VAV overhead air distribution will continue to be (by far) the most used system in new buildings. ADPI will be endorsed by the ASHRAE Fundamentals as a method of predicting both thermal uniformity (complying with the vertical stratification requirement of standard 55), and that the average room air speed is less than 40 fpm, allowing the graphical and PMV calculations of Standard 55. – The 55 committee agrees and is looking for final wording:10 points

10. Sadly, the Cowboys will continue to disappoint their fans. - No brainer. 10 points.

I only got 78 points (out of a possible 100). I’ll try to do better this year.

Authored by: Dan Int-Hout, Chief Engineer Krueger