Project Scientist Fred Bauman recently received the ASHRAE Fellow award, a recognition for those who have distinguished themselves in the heating, ventilation, and air conditioning (HVAC) industry. His contributions to ASHRAE and the broader industry are based on the extensive research on underfloor air distribution (UFAD) that he directed at CBE, leading to deeper knowledge and guidance for these advanced HVAC systems. More recently, he has led a similar effort within CBE to address thermally massive radiant systems. Learn more about his research and what he has been working on over the past 30+ years at UC Berkeley. Read more
It’s exciting when we have the opportunity to experience new sustainable buildings first hand. Last week, while attending the CHESC conference at UC Santa Barbara, along with other attendees I stayed in newly completed student housing designed to meet LEED Platinum standards. While these attractive new buildings exhibit many sustainable features, at times the natural ventilation scheme was not sufficient to maintain comfortable conditions, especially when it was necessary to lower blinds for privacy, or to close windows to block noise from the street and some late night volleyball games.
However, a simple and cost-effective addition to these units would have kept us all comfortable: ceiling fans. CBE research has quantified what we all know intuitively, that fans can provide acceptable comfort at temperatures that otherwise would be stifling. This enables passive solutions in milder climates, and may reduce the reliance on air conditioning in climates where passive solutions alone are not sufficient. Read more
In March, CBE’s research team received the welcome news of a successful proposal led by the UC Davis Energy and Efficiency Institute, with Lawrence Berkeley National Laboratory and UC Berkeley, to form a new California Energy Product Evaluation (Cal-EPE) Hub. The objective of the Cal-EPE Hub is to evaluate commercially available technologies that are relevant to institutional and commercial customer procurement processes, including products related to energy efficiency, renewable distributed generation, and distributed storage. This work will lead to a buyer’s guide directed toward potential customers hoping to make more informed decisions. Read more
This spring, CBE welcomes a global HVAC manufacturer as one of its newest industry members. Having yet to fully establish themselves in North America, you could be forgiven for not recognizing the Daikin brand. However, with annual sales of over 17 billion dollars, Daikin is indeed a global leader in air conditioning equipment.
An important goal at the Center for the Built Environment is to provide tools to assist industry professionals to create energy efficient and comfortable buildings. To this end, in 2013 we first launched the online CBE Thermal Comfort Tool as a way to help practitioners predict thermal comfort in buildings, according to the primary industry standard, ASHRAE Standard 55. CBE’s tool has been actively used, with as many as 6000 users per year, and it offers numerous capabilities, which we have expanded in the most recent version. Read more
CBE’s research team recently completed an ambitious project with complementary goals of making buildings occupant-responsive in real time, and addressing outdated rules-of-thumb that were leading to poor performance in both energy use and occupant comfort. Among the numerous findings from this work, it demonstrated that “personal comfort” chairs led to comfort satisfaction for 96 percent of the test subjects, a level well above what is observed in most buildings. The project team also developed and tested innovative HVAC control methods offering significant energy saving potential, and that may be easily implemented in commercial buildings using the most common overhead variable-air-volume (VAV) reheat systems. Read more
An expected benefit of the Internet of Things (IoT) in buildings will come from an improved ability to monitor indoor environments in ways that lead to actionable insights. A panel session hosted by UC Berkeley’s Center for the Built Environment (CBE) explored three innovative methods to monitor buildings using the latest in sensing and communicating technologies. The ideas range from futuristic to immediately applicable, with a focus on measuring CO2. Understanding CO2 concentrations in buildings is important, as several recent studies suggest that high levels of the gas may have negative effects on our cognitive performance, yet there are challenges to measuring it in a reliable and comprehensive manner. Read more
In a zero-net energy world, operation of both buildings and the electric grid need to be more flexible and responsive. This symposium explored the interaction of ZNE buildings, DERs and the increasingly renewable-rich electrical grid. It brought together engineering and design professionals, policy experts, researchers and other thought leaders to address how recent successes are changing existing ZNE paradigms, and how our policies, building energy standards, and aspirational ‘Big Bold Energy Strategies’ should evolve to deliver deep greenhouse gas reductions and a healthy economy in the next decade. Read more
As part of a four-year study on the design and operation of radiant systems, CBE in collaboration with the New Buildings Institute (NBI) and TRC Energy Services have completed case studies of nine commercial buildings that demonstrate good performance in terms of both energy performance and occupant satisfaction in buildings with radiant systems. These include commercial, government, and higher education buildings, and all but one were built, or underwent major renovations, since 2010. The projects represent diverse approaches to radiant system design, including in-slab and ceiling panel solutions. Eight projects are located in western U.S. states, and one in British Columbia. Read more
Two reports released from UC Berkeley’s Center for the Built Environment provide valuable insights into the effectiveness of radiant cooling and heating systems, a promising HVAC technology that is becoming increasingly used in commercial buildings in North America, including in a high proportion of ultra-low and zero-net energy buildings. These reports reveal how such systems work in practice, analyzing comprehensive data from a large group of buildings in operation. Read more
CBE Director Edward Arens, PhD, came to UC Berkeley in 1980 and soon founded the Building Science Group. In this interview he reflects on major milestones in the formation of CBE’s organization and contributions. Read more