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

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Presentation on theme: "HEALTHCARE BUILDING AUTOMATION Guiding Principals, Applications and Operation Presented by Peter Sabeff."— Presentation transcript:

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 1)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

6 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

7 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?

8 HEALTHCARE MONITORING AND CONTROL ISSUES 7)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 8)Redundancy  Automatic backup with failures  Equipment interactions with pump failures

10 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 energy use confirms success

11 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

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)

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18 HUMIDIFICATION Cold weather: # 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

20 GRAPHICS 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  3 rd party overlay General or operator directed Large capacity/long duration Experience based mining / correlation of data  Must have the I/O

23 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.

24 ST. ANTHONY HOSPITAL, LAKEWOOD, CO

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


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