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©2019, ASHRAE Chapter 095
Madison, Wisconsin Chapter 


April 13, 2020

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April Chapter Meeting
April 13, 2020
11:45 AM - 1:30 PM

Madison, WI
ASHRAE April Refrigerant (virtural) Meeting

$0.00 Member Registration

$0.00 Guest (non Madison ASHRAE member)

$0.00 Cafeteria Plan - Local Member

$0.00 Student Ticket

Main Presentation - 12:00 pm - 1:30 pm

ASHRAE Madison Chapter April Virtual Meeting
Mon, Apr 13, 2020 12:00 PM - 1:15 PM (CDT)

Please join my meeting from your computer, tablet, or smartphone.

A recording of the meeting can be found at this Facebook link:


Main Presentation Highlights:

The Future of Refrigerants

Safe non-flammable low toxicity F-gases allowed for an exponential increase in the standard of living of society through increased food productivity, reduction in heat related deaths, increased worker productivity and migration of people to cities and to hotter climates.  Refrigerant safety was successfully maintained during the chlorofluorocarbon (CFC) refrigerant transition starting the 1990’s to lower ozone-depleting refrigerants with the development of hydrochlorofluorocarbons (HCFC’s) and hydrofluorocarbons (HFC’s) chemistries.  The orderly transition from CFCs to HCFCs and HFCs achieved a balance between the societal environmental demands for reduced ozone depletion while continuing to improve the standard of living in developing countries and minimize the societal safety impacts for everyone.

New societal environmental demands to control climate change are driving the development of new regulatory policies to restrict and lower the direct GWP (global warming potential) impact of F-gases.  These regulatory activities have driven significant refrigerant technology development activities globally as a result of climate change concerns.  Today designers are being asked to consider new lower direct GWP unsaturated hydrofluorocarbons (HFOs) refrigerants, some of which are slightly flammable under certain conditions, as well as revisiting the application of natural refrigerants, like carbon dioxide, ammonia, hydrocarbons and water. 

This presentation will provide an update on new lower GWP alternatives introduced into the market place and will highlight some important considerations, particularly flammability, that engineers, designers, and building owners should keep in mind regarding next-generation refrigerants.

Stephen “Steve” Kujak

Steve has spent over 28 years being involved in numerous technology and product development projects involving the development of new refrigerants, lubricants, compatibility of system materials and environmental sustainability initiatives. Steve holds a bachelor of science in chemistry from the University of Wisconsin-La Crosse and a master’s degree in analytical chemistry from the University of North Dakota.

He has been a member of ASHRAE since 2005 and is a distinguished service member of ASHRAE. His ASHRAE and industry activities include contributing to refrigerant safety and use standards. He was awarded the ASHRAE Crosby Field award for highest-rated presentation of a technical paper in 2016 and was also awarded the George Briley Refrigeration Committee award for best ASHRAE journal article on refrigeration in 2017 and 2018.

Steve has been an author or co-author of greater than 50 publications related to refrigerants and has 18 patents related to HVAC products.

Steve works for Trane Technologies as the director of next-generation refrigerant research in La Crosse, Wisconsin where he has lived with his wife Annette on the Mississippi River in Brownsville, Minnesota and both enjoy the beauty the drift-less region provides.