Our Next Meeting
Date: Tuesday, February 14, 2012
Time: 11:30AM-1:00PM
Location: Pensacola Civic Center
General Meeting Speaker: DAVID A.
JOHN, P.E.
Metal Industries, Inc.
Clearwater, Fl.
David A. John has over 31 years of experience working
in the HVAC industry including working as a design engineer for a
mechanical contractor, and a project engineer for a performance
contracting group. He spent over 26 years working for air
distribution equipment manufacturers where he currently serves as the
Director of Marketing and New Business Development for Metal Industries,
Inc. a manufacturer of air distribution and life safety products located
in Clearwater, Florida.
David is actively involved in the American Society of
Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) where he
currently is a member of the Handbook Committee, Chair of Standard
Project Committee (SPC) 129 Measuring Air-Change Effectiveness, Chair
for the Project Monitoring Subcommittee (PMS) RP-1335 Effects of Typical
Inlet Conditions on Air Outlet Performance, is a member of TC 5.3 Room
Air Distribution and is a member of SPC 200 Methods of Testing Chilled
Beams. He is also a corresponding member of TC 5.6 Control of Fire
and Smoke.
His past positions at ASHRAE included Chair of TC 5.3 Room Air Distribution, Subcommittee Chair and one of the principle authors for TC 5.3 2007 ASHRAE Handbook Application Chapter 56 Room Air Distribution, 2008 ASHRAE Handbook HVAC Systems and Equipment Chapter 19 Room Air Distribution Equipment, and the 2009 ASHRAE Handbook Fundamentals Chapter 20 Space Air Diffusion. He also was the Chair of the PMS for the ASHRAE research project 1065 Design Guide to Ceiling Based Air Diffusion and was a member of the PMS for ASHRAE Research Project 1292: Comparison of the total energy consumption of series versus parallel fan powered VAV terminal units. He co-authored the ASHRAE paper Cold Air Distribution, Application, and Field Evaluation of a Nozzle-Type Diffuser.
David is active in the Air Conditioning, Heating, and Refrigeration Institute (AHRI) where he is currently in-coming Chair for the Air Control and Distribution Devices (ACDD). He also serves on the ACDD engineering committee as well as on the Chilled Beams Section Committee.
Topic: " Fundamentals of Room Air Distribution "
This talk focuses on room air distribution principles for mixed air systems, fully stratified, and partially stratified systems. Discussion covers jet theory, room air induction, defines occupied zone, effective draft temperature, and reviews interpretation of data obtained per ASHRAE standard 70. Also covered are selection methods including sound, throw, and Air Diffuser Performance Index (ADPI).
RSVP: RENALL@southernco.com by Friday, February 10, 2012