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Shaping Tomorrow's Built Environment Today
February 27, 2025
The U.S. Department of Energy (DOE) will delay the implementation of seven of the Biden-Harris administration’s mandates on home appliances. These actions postpone the efficiency standards for the following home appliance rules: central air conditioners, walk-in coolers and freezers, gas instantaneous water heaters, commercial refrigeration equipment, air compressors, and more. The DOE is creating a new energy efficiency category for natural gas tankless water heaters. Read more
Bioaerosol emissions during toilet flushing are an often-overlooked source of potential health risks in shared public facilities. A new study from the Society for Risk Analysis found that bioaerosol concentrations of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) exceeded acceptable levels established by the Centers for Disease Control after toilet flushing. The research was conducted in two restrooms located in an office building in China, measuring the emissions of bioaerosols containing S. aureus and E. coli under various flushing conditions and ventilation scenarios. Read more
PublicRestroom
When extreme weather and natural disasters such as wildfires and hurricanes descend on a region, the immediate concern is typically damage from the event itself, but the power outages that often accompany such events can be dangerous as well. A new study published in PLOS Climate is among the first to parse how different kinds of extreme events affect the power grid in the United States. Read more
A research team from the Zhongyuan University of Technology in China has designed a photovoltaic-thermal (PVT) integrated air-source heat pump hot water system that uses a phase change tank to lower energy consumption and achieve higher power generation performance than conventional heat pumps. The system is designed to use water as a working medium and to provide circulation power for forced circulation. Read more
Building graphics are the windows into system performance. Join Journal Technical Editor Rebecca Matyasovski and Brian Clark as they discuss what makes a good building graphic and tips to improve them. This technical feature appears in the February 2025 issue of ASHRAE Journal.
 
 
Hot Air Podcast: How Particle Filters Work with Kathleen Owen
ASHRAE Journal
By Kelley Cramm, P.E.
This column covers basic electrical concepts that mechanical designers need to know. It also discusses information each discipline needs from the other to create a safe, functional, code-compliant design. Download here
ASHRAE News
The 2025 ASHRAE Winter Conference brought together HVAC&R industry leaders, experts and professionals for an engaging and impactful event focused on key topics such as artificial intelligence, emerging technologies and workforce development. Taking place February 8-12 in Orlando, Florida, the conference attracted close to 3,800 attendees and featured more than 400 committee meetings, 111 technical sessions and numerous networking and social events. Running concurrently, the AHR Expo occupied the Orange County Convention Center, hosting more than 1,800 exhibitors, showcasing the latest HVAC&R technologies, products and services to an estimated 50,000 attendees over three days. Read more
In Case You Missed It
A new design for an artificially intelligent residential heat pump can potentially achieve energy savings of 5%-13% for homeowners. The tech breakthrough was recently announced by the Fraunhofer Institute for Solar Energy Systems in Germany, the largest solar research institute in Europe, in a press release that states that the next-generation heat pumps can use artificial neural networks to learn and adapt to changing environmental conditions. Read more
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