HVAC

Figure 5: Simplified control diagram for a multizone variable air volume system. Courtesy: CDM Smith

How to achieve ASHRAE 62.1 compliance for VAV system design

Zachary Londo, PE, GF

Ep. 55 When, where can radiant hydronic HVAC systems deliver results?

Expert Q&A: IAQ and the limits of prescriptive ventilation

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Ep. 46 Putting the new A2L refrigerants into practice for HVAC

Figure 5: Piping manifold secondary distribution piping to geothermal bore field. Courtesy: CDM Smith

Case study: How one city is using energy-efficient geothermal systems

Figure 4: In addition to changing the compliance process in ASHRAE 90.4 from 2016 to 2022, the mechanical load component (MLC) values are more stringent across all climate zones. ASHRAE acknowledged that the MLC values in the 2016 edition needed to be lowered to ensure reasonable energy efficiency. Courtesy: Bill Kosik, WSP

ASHRAE 90.4 created to boost data center energy efficiency

AHR Expo 2025: Interview with Josh Talley

Impact of high-global warming potential (GWP) refrigerants for engineers, building owners

HVAC industry trends on display at AHR Expo