Beyond HVAC CQ

Confusion Worth Avoiding: Design Vs. Minimum Air Changes Per Hour (ACPH)

Beyond HVAC CQ, CQ Insights /

Confusion Worth Avoiding: Design Vs. Minimum Air Changes Painful conflicts and problems in HVAC design often arise due to misunderstanding of the design requirements. When designing HVAC systems for pharmaceutical cleanrooms, one parameter that often creates confusion is Air Changes Per Hour (ACPH). ACPH significantly affects duct sizing, filter selection, air handling units (AHUs), space […]

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ISO 14644-16: Are 50 Pages Worth $500,000 of Energy Savings?

Beyond HVAC CQ /

ISO 14644-16: Are 50 Pages Worth $500,000 of Energy Savings? ISO standards are usually a dry read, full of generalities with a few specifics — and open to different interpretations. An encounter with a typical ISO standard can easily drain your energy. But ISO 14644-16 (Energy Efficiency in Cleanrooms and Separative Devices) seems to be

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Project Schedule: A Knife that Divides the Team or Glue that Unites?

Beyond HVAC CQ /

Project Schedule: A Knife that Divides the Team or Glue that Unites? It was yet another meeting in our $200 million fill-and-finish project. The agenda? To review the progress against the schedule. Displaying the schedule on the screen, Gorky began describing the progress: area A is now 80% complete, the autoclave is on its way

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