Posts by Miles Ryan

Miles Ryan, P.E., writes a monthly column in Engineered Systems Magazine on Building Commissioning. Read December’s column below: Resiliency has been a buzz word for the past few years in the Air Force. It is the ability to bend, but not break, when something goes wrong. This term is used in a variety of contexts,…

Miles Ryan, P.E., writes a monthly column in Engineered Systems Magazine on Building Commissioning. Read November’s column below: During some projects, commissioning providers may have limited chances to have our recommendations heard. I have found that if your recommendation includes challenging the Big Mistake1 often seen with a demand-controlled ventilation (DCV) sequence for air handing…

Miles Ryan, P.E., writes a monthly column in Engineered Systems Magazine on Building Commissioning. Read October’s column below: Demand Controlled Ventilation (DCV) is a control strategy which aims to vary the amount of ventilation air a system provides a space based on the real-time ventilation requirements (i.e. the ventilation demand) of the space. The term…

Miles Ryan, P.E., writes a monthly column in Engineered Systems Magazine on Building Commissioning. Read September’s column below: In August’s column, I discussed three-way control valves, their associated bypass pipes, and the importance of a balancing valve being located within the bypass pipe. Such balancing valves are needed to throttle flow. If missing, or left…

Miles Ryan, P.E., writes a monthly column in Engineered Systems Magazine on Building Commissioning. Read August’s column below: Bypass pipes, accompanied by a three-way control valve, are often seen in hydronic systems at both served loads (e.g., reheat coils) as well as primary equipment (e.g., cooling towers). Reasons for utilizing a three-way control valve and…