(reposting)
One of the biggest things I learned working with the Europeans on the net-zero guidebook was that they shut spaces down at night.
They cut the air to the admin wing, they cut the air to the day clinics,... (More)
Unoccupied Mode: Turndown, shutdown, low occupancy controlsMany hospital spaces operate 24/7 with large airflows and specific temperature and humidity requirements, but are occupied less than 12 hours/day. Space pressure relationships and other regulatory requirements can be maintained with much lower airflow rates and relaxed temperature ranges. Reheat loads can be significantly reduced during these unoccupied periods. Many other hospital areas are not occupied nights and weekends, including administrative areas and some patient care areas. It is common for HVAC systems serving these areas to remain in operation during these unoccupied times. Systems serving these areas can either be turned off or turned down in many circumstances, saving heating, cooling, and fan energy.
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Many hospital spaces operate 24/7 with large airflows and specific temperature and humidity requirements, but are occupied less than 12 hours/day. Space pressure relationships and other regulatory requirements can be maintained with much lower airflow rates and relaxed temperature ranges. Reheat loads can be significantly reduced during these unoccupied periods. Many other hospital areas are not occupied nights and weekends, including administrative areas and some patient care areas. It is common for HVAC systems serving these areas to remain in operation during these unoccupied times. Systems serving these areas can either be turned off or turned down in many circumstances, saving heating, cooling, and fan energy.
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