healthcare building automation guiding principals, applications and operation presented by peter...
TRANSCRIPT
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HEALTHCARE BUILDING
AUTOMATIONGuiding Principals,
Applications and Operation
Presented by Peter Sabeff
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SIMILAR, BUT MORE
Commercial Buildings
Temperature control
Building pressure control
Occupied/Unoccupied control
Warm up/cool down
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SIMILAR, BUT MORE
Healthcare
The above (Commercial Buildings), plus• Space & pressure relationships• Humidity control
Less influence• Warm up/cool down
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HEALTHCARE CHALLENGES
Humidity Control – Humidification & Dehumidification
Air Quality
Space & Building Pressurization
Optimization – AHU and Plant Equipment
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HEALTHCARE MONITORING AND CONTROL ISSUES1)Understand the systems
– terminal units, AHU, plant
2)Equipment over/under sizing
3)Interactions between temperature, pressure, flow and humidity control
4)Variable everything – good and bad
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HEALTHCARE MONITORING AND CONTROL ISSUES
5) 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
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HEALTHCARE MONITORING AND CONTROL ISSUES
6) Building pressurization
Significant exhaust air – constant and variable
Many entrances/exits – high pedestrian traffic
Outside air control/conditioning issues – freezing, high humidity
Control strategies?
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HEALTHCARE MONITORING AND CONTROL ISSUES
7) Room Control
Central cooling source - 55F +/- discharge air
Individual heating control
Thermostat location
Occupied/Unoccupied – how do we know?
Occupant thermostat manipulation
Zoning
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HEALTHCARE MONITORING AND CONTROL ISSUES
8) Redundancy
Automatic backup with failures
Equipment interactions with pump failures
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INSTRUMENTATION – THE STEPS
1) DDC monitoring and control
2) Validation of I/O accuracy
3) Validation of sequences of operation
4) Validation of programming – normal, off normal, failure
5) System interactions
6) Integrated system interactions
7) Tighten the belt
8) Repeat steps 1 through 7 until satisfied and energyuse confirms success
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MONITORING
Temperature and Humidity Room temps
Terminal unit functions
AHU functions
Plant functions
Pressures AHU – internal/external
HW/CHW differential
Rooms/positive - negative
Building – positive/negative/wind
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MONITORINGFlows
Minimum/Maximum – OSA , Chillers, VAV
Tracking
Global
Outside air temperature and humidity
Operating schedules
Building electric demand (main meter)
System electric demand (aggregate equipment)
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HUMIDIFICATION
Cold weather: 0.002 # moist air / # dry air (or less)
45F at 20% RH
Return air: 0.006 +/- 72F at 30% RH0.004 72F at 20% RH
Economizer free cooling – cold/dry air adds humidification load
Humidifier sizing – Min or max OSA?
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OR HUMIDITY VIA COOLING/CONDENSING
ORRoom
Temperature
RoomHumidity
(Maximum)
DischargeAir
Temperature
Must Be
ChilledWater
Temperature Must Be
72F 60% 57F 47F70F 60% 55F 45F68F 60% 54F 44F66F 60% 52F 42F64F 60% 49F 40F62F 60% 47F 38F
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GRAPHICS
Basic
Floor plans Terminal units Air handling units Heat exchangers/pumping Chilled water Condenser water
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GRAPHICS
Enhanced
AHU discharge temp, CHW valve pos, CHW S & R temps, power
System Power Consumption – pumps + fans + compressors + etc.
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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
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DATA MINING
1) Sequencing of components that function in series
2) Hi and Lo limits
3) Occupied/Unoccupied
4) Starting is easy – when do we stop?
5) Riding it out
6) Make one change at a time.
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ST. ANTHONY HOSPITAL, LAKEWOOD, CO
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HEALTHCARE BUILDING
AUTOMATIONGuiding Principals,
Applications and Operation
Presented by Peter Sabeff