HEALTHCARE BUILDING AUTOMATION Guiding Principals, Applications and Operation Presented by Peter Sabeff

SIMILAR, BUT MORE Commercial Buildings Temperature control Building pressure control Occupied/Unoccupied control Warm up/cool down

SIMILAR, BUT MORE Healthcare The above (Commercial Buildings), plus Space & pressure relationships Humidity control Less influence Warm up/cool down

HEALTHCARE CHALLENGES Humidity Control – Humidification & Dehumidification Air Quality Space & Building Pressurization Optimization – AHU and Plant Equipment

HEALTHCARE MONITORING AND CONTROL ISSUES Understand the systems – terminal units, AHU, plant Equipment over/under sizing Interactions between temperature, pressure, flow and humidity control Variable everything – good and bad

HEALTHCARE MONITORING AND CONTROL ISSUES Unwanted gains and losses Humidifier heat (jacketed humidifiers) Reheat coil heat migration Overlapping sensing and control of components in series Fan heat Outside air heat – roofs, hot exhaust air, condensing units Control component failures Lack of outside/return air mixing Preheat coil overshoot

HEALTHCARE MONITORING AND CONTROL ISSUES Building pressurization Significant exhaust air – constant and variable Many entrances/exits – high pedestrian traffic Outside air control/conditioning issues – freezing, high humidity Control strategies?

HEALTHCARE MONITORING AND CONTROL ISSUES Room Control Central cooling source - 55F +/- discharge air Individual heating control Thermostat location Occupied/Unoccupied – how do we know? Occupant thermostat manipulation Zoning

HEALTHCARE MONITORING AND CONTROL ISSUES Redundancy Automatic backup with failures Equipment interactions with pump failures

INSTRUMENTATION – THE STEPS DDC monitoring and control Validation of I/O accuracy Validation of sequences of operation Validation of programming – normal, off normal, failure System interactions Integrated system interactions Tighten the belt Repeat steps 1 through 7 until satisfied and energy use confirms success

MONITORING Temperature and Humidity Pressures HW/CHW differential Room temps Terminal unit functions AHU functions Plant functions Pressures AHU – internal/external HW/CHW differential Rooms/positive - negative Building – positive/negative/wind

MONITORING Flows Minimum/Maximum – OSA , Chillers, VAV Tracking Global Outside air temperature and humidity Operating schedules Building electric demand (main meter) System electric demand (aggregate equipment)

HUMIDIFICATION Cold weather: 0.002 # moist air / # dry air (or less) 45F at 20% RH Return air: 0.006 +/- 72F at 30% RH 0.004 72F at 20% RH Economizer free cooling – cold/dry air adds humidification load Humidifier sizing – Min or max OSA?

OR HUMIDITY VIA COOLING/CONDENSING Room Temperature Humidity (Maximum) Discharge Air Temperature Must Be Chilled Water Temperature Must Be 72F 60% 57F 47F 70F 55F 45F 68F 54F 44F 66F 52F 42F 64F 49F 40F 62F 38F

GRAPHICS Floor plans Terminal units Air handling units Basic Floor plans Terminal units Air handling units Heat exchangers/pumping Chilled water Condenser water

GRAPHICS Enhanced AHU discharge temp, CHW valve pos, CHW S & R temps, power System Power Consumption – pumps + fans + compressors + etc.

DATA MINING Adds intelligence to BAS trending 3rd party overlay General or operator directed Large capacity/long duration Experience based mining / correlation of data Must have the I/O

DATA MINING Sequencing of components that function in series Hi and Lo limits Occupied/Unoccupied Starting is easy – when do we stop? Riding it out Make one change at a time.

ST. ANTHONY HOSPITAL, LAKEWOOD, CO

HEALTHCARE BUILDING AUTOMATION Guiding Principals, Applications and Operation Presented by Peter Sabeff