Daniel Int-Hout, III
Chief Engineer
1401 North Plano Road
Richardson, TX 75081
United States
(214) 557-7482
Region: VIII
Honorarium: None
Mr. Dan Int-Hout, Special Projects Coordinator for Nailor, is responsible for managing a number of special projects including Air Distribution, Air Terminals and Fan Coils, as well as developing dynamic data presentations for these products. Mr. Int-Hout joined Nailor in 2020, but has had several other jobs in the industry, in engineering, marketing and product research roles, with Owens Corning Fiberglas, Carrier, Titus, Krueger and Environmental Technologies. Mr. Int-Hout has been in the air distribution research and design business since 1973, has a Masters degree in Business Management from Central Michigan University, and a Bachelor’s degree in Biology and Physics from Denison University. Mr. Int-Hout has written over fifty technical papers and articles on VAV system performance, acoustics, air diffusion, controls and occupant comfort. He was recently Chairman of both ASHRAE Technical and Standards Committees on Thermal Comfort, is a past Chairman of several other related ASHRAE Technical and Standards Project Committees, as well as a member of ASHRAE Standards, Research Activities and Environmental Health Committees. He received the ASHRAE Distinguished Service Award and Served on the ASHRAE Board as a Director At Large. He is currently the Chairman of the AHRI Committee on Applied Acoustics (885) and past Chair of ISO 205 U.S. Panel on Thermal Comfort.
Methods of Effective Room Air Distribution

In order to meet the increased expectations of building occupants, designers must be aware of the conflicts between first cost economics, occupant productivity and life cycle costs. Buildings that do not meet the needs of the occupants often result in expensive redesign or worse, result in lawsuits against all parties involved. First, we need to understand the rules:

  1. LEED: 2009 is out, and many are not aware of some significant changes that have resulted in air distribution, IAQ and Comfort.
  2. Thermal Comfort: Determining optimum occupant comfort strategies. ASHRAE Standard 55 has been revised.
  3. Acoustics: Accurately predicting end use environments. A new classroom acoustical requirement needs to be understood.
  4. IAQ: The changing face of ASHRAE Standard 62.1, and upcoming developments.

With the goal of saving energy over the 90.1 baseline (Overhead VAV), many architects are challenging the mechanical engineer to come up with alternate systems that will meet this goal.  Displacement Ventilation (DV), Underfloor Air Distribution (UFAD) and Chilled Beams all have a potential to save energy, and meet these needs.

I will briefly cover pros and cons of all 4 methods of air delivery:

You Can’t Afford Discomfort
1 Hour

While much has been said about saving energy, little is said of the downside if the savings strategy reduces occupant productivity. The average salary in any office is 100 times greater than the full cost of heating and cooling that space. Strategies that add to the first, renovation, or operating cost of a space have to be weighed against the potential for reduced productivity when calculating the time to payback.

We aren’t doing a very good job, it seems. BOMA continues to report that the #1 reason for tenants not renewing the lease is “occupant dissatisfaction with the thermal environment”. ASHRAE Standard 55 describes the conditions that will satisfy a majority of the occupants. It is often referenced in code, and many LEED projects have been awarded a point for compliance, at the design stage, of course.

In practice however, we find that systems don’t operate at design, or even as designed. We will discuss the issues related to maintaining comfortable conditions.at all loads, and discuss the benefits of ventilation and economizer operations.      

The Basics of Air Distribution
1 or 2 hours (can do non-inductive AD as a separate talk, 1 hour)

The basic physics of air distribution must be fully understood before one can properly select components for a project. Air Distribution is not being taught at many Engineering schools, and young engineers are often unwilling to admit how little they actually know.  Senior engineers need to be brought up to speed on the latest understandings of air diffusion component selections.  This lecture will cover:

Selecting VAV products for Acceptable Environments

With the large number of VAV terminals available, including ECM motors for series and parallel boxes, we are getting a number of questions regarding the proper selection and interpretation of VAV terminal specifications. I will discuss:

1 Hour

Highlighting developments from 1973 until the present, I will present technical achievements, Standards Updates, and ASHRAE Research projects that all converged into an understanding and technical validation of modern approaches to comfort, energy, and building designs. The idea for the talk comes from our recent Presidential Member’s theme, and caused me to reflect on a number of technical paths that I have been involved in pursuing throughout my ASHRAE career. 

   The subject was recently discussed in my article Highlighted in the August 2016 ASHRAE Insights.