Darryl DeAngelis
Number Of Publications
16 articles
Understanding Hysteresis and Its Impact on HVAC Control Repeatability
This article explains how hysteresis in dampers and actuators undermines HVAC control repeatability and minimum outdoor air accuracy. It outlines ASHRAE research […]
FAQs on Virginia Law on Indoor Air Quality; Inspection and Evaluation
Starting July 1, 2025, Virginia public schools must verify that their HVAC systems meet ventilation standards. This includes installing permanent airflow measurement […]
IAQ for Virginia Schools
A new law will take effect in all Virginia schools starting July 1, 2025, to initiate Indoor Air Quality (IAQ) inspections and […]
Ensure Long-Term Ventilation Operation and IAQ in Virginia Schools
With Virginia’s new law requiring ventilation verification every 4 years starting July 1, 2025, it’s time for HVAC professionals and school leaders […]
Key IAQ Metrics Every FM Should Know
Lisa Hickey and Darryl DeAngelis, a business developer at EBTRON with 40 years in the HVAC industry, discuss the critical aspects of […]
Achieving Demand Control Ventilation Based on Occupancy
At South Lafourche High School and Thibodaux Middle School in Louisiana, fluctuating occupancy levels—particularly in classrooms and gymnasiums—highlighted the need for a […]
Equivalent Clean Airflow and the Importance of Validating Ventilation and Filtration Rates
ASHRAE Standard 241 introduces the concept of Equivalent Clean Airflow — a framework for combining mechanical ventilation, filtration, and other proven technologies […]
Making Healthier Buildings
Ventilation and filtration are foundational principles in healthy buildings. FMs are often burdened with reducing operating costs, and a prime target is […]
Meeting Ventilation Requirements, Achieving IAQ and Operational Efficiency
Claremore Indian Hospital recently upgraded its HVAC systems to significantly enhance indoor air quality (IAQ) and energy efficiency, ensuring optimal airflow and […]
Using CO2 Sensors for Indoor Air Quality and Energy Savings
Carbon dioxide has been utilized as a metric for indoor air quality and as an energy-saving strategy through demand control ventilation (DCV). […]