CBE Researchers Present Key Findings and New Tools at ASHRAE Atlanta 2019

At the 2019 ASHRAE Winter Conference on January 12th-16th, several CBE faculty, researchers, students and alumni will present recent results and demonstrate new design tools. We welcome conference participants to join us for these sessions, and for those of you not able to attend we provide the presentation PDFs below. 

Occupant-centric Control Technologies: Assessing Comfort, Energy Use and Cost
Tradeoffs

Sunday, January 13: 11:00 AM – 12:30 PM
Seminar 15 (Intermediate)

CBE Faculty Stefano Schiavon

Doctoral Graduate Joyce Kim

CBE faculty Stefano Schiavon and Doctoral Graduate Joyce Kim will present “Personalized Comfort Modeling for Occupant-centric Environmental Control.” A personal comfort model is a new approach to thermal comfort modeling that predicts an individual’s thermal comfort response, instead of the average response of a large population. These models can be based on environmental parameters, occupant feedback, behavior and physiological parameters. While conventional “general population” models like the PMV and the adaptive comfort model have low prediction accuracy, personal comfort models show significantly higher accuracy. Stefano and Joyce will discuss how the new models can inform space conditioning in commercial and residential buildings.

View the slide deck >>

Load Calculation Considerations for Radiant Systems

Monday, January 14, 2019: 8:00 AM – 9:30 AM
Seminar 26 (Basic)

In this session, two Berkeley PhD candidates will discuss their research that was also included in recent CBE meetings.

PhD Candidate Jonathan Woolley

First, Jonathan Woolley will present “A Side-by-Side Laboratory Comparison of Peak Space Cooling Loads and Daily Thermal Energy Use for Radiant and All-air Systems.” Radiant cooling and all-air cooling have different cooling load characteristics, yet commonly used load calculation techniques do not account for these differences. Jonathan will summarize results from a experimental comparison of radiant cooling and forced-air cooling, which reveal that for both systems to maintain equivalent operative temperatures, the radiant system must extract more heat from a space than a forced-air system, and that the peak space cooling load for radiant must be larger and must occur earlier. The presentation will provide the fundamental explanation for these differences and demonstrate how they are influenced by heat gain type, indoor surface characteristics, and the presence of passive cooling.

View the slide deck >>

PhD Candidate Carlos Duarte

Later in the session Carlos Duarte will present on “Development and Demonstration of an Interactive Web-based Design Tool for High Thermal Mass Radiant Cooling Systems.” Standard load calculation tools based on steady-state conditions with a constant zone temperature are not appropriate for the design of high thermal mass radiant systems. While dynamic simulation tools can properly calculate the space cooling load and size the hydronic plant for these systems, detailed simulation tools are complicated and time-consuming. Carlos will introduce and demonstrate an easy-to-use, interactive web-based design tool for high thermal mass radiant systems developed by CBE with feedback and input from its industry partners.

View the slide deck >>

Empirical Verification of Metabolic Heat, Moisture and Contaminant Dissipation Rates from Occupants at Various Activity Levels

Wednesday, January 16, 9:45 AM – 10:45 AM
Forum 2 (Intermediate)
Sponsor: 2.1 Physiology and Human Environment, Chair: Hui Zhang

Yongchao Zhai

Former post-doctoral scholar Yongchao Zhai, now with Xi’an University of Architecture and Technology, will present new fundamental studies (such as the met levels for supine, sedentary, standing, walking) to comfort consequences, and compare with ASHRAE and international standards. The session will be chaired by CBE Researcher Hui Zhang.

Committee Activities

Several CBE students and alumni will be involved in the ASHRAE Standard 55 Committee meeting on Saturday and Sunday:

  • Graduate student Megan Dawe will present her research on the question of  “Do we need to measure mean radiant temperature?” View the slide deck >>
  • CBE faculty Stefano Schiavon will present new work on “Analysis of the accuracy on PMV – PPD model using the ASHRAE Global Thermal Comfort Database II.”
  • Former CBE post-doctoral scholar Shichao Liu will present “A new comfort model for thermally stratified systems.”

Project Scientist Fred Bauman

Recognition for new ASHRAE Fellow Fred Bauman

In Atlanta this year CBE Project Scientist Fred Bauman will receive the ASHRAE Fellow award, a recognition for those who have distinguished themselves in the HVAC industry. Fred’s many contributions to ASHRAE and to the building industry are based on his extensive research on underfloor air distribution (UFAD) and his recent work to address important research questions on thermally massive radiant systems. Fred will receive his award at the Plenary Session on Saturday, on January 12, at 3:15 pm.