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Shaping Tomorrow's Built Environment Today
June 5, 2025
As summer temperatures begin to rise across the country, a headache is also heating up for the air conditioning industry. A shortage of R-454B refrigerant, the eco-friendly coolant poised to replace older formulas, is threatening to disrupt cooling systems at the worst possible time. Manufacturers have issued warnings about potential legal and damage concerns about refrigerant mixing as a strategy to mitigate the shortages. Read more
The U.S. Department of Energy canceled $3.7 billion in awards from its Office of Clean Energy Demonstrations (OCED), including $540 million in grants for two carbon capture projects planned by Calpine. Sixteen of the 24 terminated awards were signed between President Donald Trump’s election in November and Jan. 20. The DOE assessed the canceled awards under a review process outlined in May and said it is reviewing 179 awards that total over $15 billion in financial assistance. Read more
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Last week, a federal court blocked President Trump from adopting tariffs under an emergency-powers law, which the administration is appealing. This sets up additional legal wrangling in addition to the conflicts over trade that were already happening. Analysts at the research firm Wood Mackenzie gave themselves the task of predicting where U.S. tariff policy may be heading. The result is a report issued this week, “Trading Cases: Tariff Scenarios for Taxing Times,” that shows the huge gap in outcomes between a trade war and a trade truce. Read more
A group of researchers from China's Beijing University of Civil Engineering and Architecture have developed a new methodology to improve the performance of solar-powered air source heat pumps. The proposed approach reportedly increases the energy efficiency of optimized building systems by 18%, with solar energy potentially reducing their carbon content by 37.78%. Read more
ASHRAE Journal Podcast Episode 47 Reducing Emissions from Heating Hot Water Systems
Join David Schurk and Mark Nunnelly as they discuss the unique dehumidification needs of hospital operating rooms. Topics of conversation include various system design options, how to strike a balance between compliance and occupant comfort, and general guidance for hospital design engineers.
 
Listen
 
David Schurk, P.E., Life Member ASHRAE, and Mark Nunnelly, P.E., Member ASHRAE
ASHRAE Journal
By Andy Pearson, Ph.D., C.Eng.
The first explanation of the relationship between heat and work, the science that we now call “thermodynamics,” was published by the French scientist Sadi Carnot exactly 200 years ago. Carnot is world-famous but little of his life story is known, and he is often incorrectly characterized as a loner who developed his theory in isolation from the scientific community, not recognized in his lifetime. The ASHRAE Historical Committee encouraged the creation of this article to mark the bicentenary of Carnot’s original publication. Download here
ASHRAE News
Held in Chicago from October 22-24, the 2025 Building Decarbonization Conference will be an information and idea exchange between stakeholders in the built environment industry concerning the reduction of GHG emissions in new and existing buildings and systems. The conference will bring together engineering and technical solution providers with building owners, utility program managers, local governments and financial services providers who are increasingly challenged to meet stringent building decarbonization goals, policies and regulations in a practical, cost-effective manner. Read more
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In Case You Missed It
Researchers at the University of Nottingham in the UK have demonstrated the feasibility of residential ice-source heat pumps in cold climates and densely populated areas. They designed a heat pump system that uses existing gas pipelines to transport water. Read more
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