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November 12, 2018

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November 2018 Meeting
November 12, 2018
5:00 PM - 8:00 PM
Vintage Brewing Co. - Madison
674 South Whitney Way
Madison, WI 53711
Proper Control Valve Selection & Advanced Coil Selection at Low Flow Conditions

$20.00 Member Registration

$30.00 Guest (non Madison ASHRAE member)

$0.00 Cafeteria Plan - Local Member

$0.00 Student Ticket

Technical Session - 5 pm (optional) - "Proper Control Valve Selection, An Engineer’s Perspective" - Doug Showers - Affiliated Engineers, Inc.

Dinner - 6:00 pm

Main Presentation - 7:00 pm - “Advanced Coil Selection with Respect to Low Flow Conditions”  By Gene Nelson - Retired, former engineer at Affiliated Engineers, Inc.  

Technical Session Highlights:

We count on control valves to maintain a stable, linearized control response and to provide positive shutoff when not used. Doug will explore many of the options available and his perspective on what makes a good valve/actuator selection. Discussion will include: what is control authority, how to size valves, how to select valves and actuators for good control, positive shutoff, and long useful life.


Main Presentation Highlights:

Coil selection software does a good job of selecting coils at full load conditions. But many engineers do not consider what happens at low part load conditions which occur most of the time. Low flow issues are further enhanced when engineers select coils based on low pressure drop to decrease energy consumption. When flow is too low, laminar flow conditions may result which leads to unstable and unpredictable heat transfer, hunting control valves, low delta T for the waterside, and potential freeze conditions. Gene explores the parameters which affect laminar flow and offers possible options in selecting coils and controls for high turndown.



Doug Showers, P.E.

 Instrumentation and Controls Engineer

Doug received his BS degree in mechanical engineering from University of Wisconsin – Madison in 2003. He is a registered Professional Engineer in the State of Wisconsin.

He has 15 years of HVAC controls design experience with Johnson Controls, University of Wisconsin and AEI. He has hands-on experience in building automation (BAS), programmable logic controllers (PLC), and distributed control systems (DCS) for combined heat and power plants and research facilities. He has developed the process and instrumentation diagrams, installation specifications, and wiring details for control systems. He has extensive experience working on complex and large university campus distribution systems.

Doug is a member of International Society of Automation (ISA).

He has been married for 14 years and has two boys. Activities outside of work include playing ice hockey and coaching Little League baseball in Verona.


Gene Nelson, P.E.

 Mechanical Engineer

Gene received his BS degree in mechanical engineering from University of Wisconsin – Madison in 1974. He is a registered Professional Engineer in the State of Wisconsin.

He has 44 years of HVAC design experience with a mechanical contractor and 2 engineering firms. He has completed over 40 major projects (over 8 million sf) located in major cities coast to coast in the US and in the middle east. Projects included major commercial, industrial, healthcare, pharmaceutical, and research and development (R&D) facilities.

Gene is a Life Member of the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) and was President of the Madison ASHRAE Chapter from 2007 to 2008. He has been awarded ASHRAE’s “Energy and Technology Award” two times at the regional and society levels (1981 and 1994). 

He has been married for 45 years and one married daughter. Activities outside of work include 22 years as a performing musician in a country gospel band (guitar and mandolin). He has been a recording artist and a recording engineer with 9 CDs recorded and working on CD number 10.