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

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

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

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

5. 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

6. 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

7. 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?

8. 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

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

10. 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

11. 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

12. 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)

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

19. 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

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

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

22. 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

23. 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.

24. ST. ANTHONY HOSPITAL, LAKEWOOD, CO

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