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HEALTHCARE BUILDING AUTOMATION
Guiding 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 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
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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
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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?
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HEALTHCARE MONITORING AND CONTROL ISSUES
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
Redundancy Automatic backup with failures Equipment interactions with pump failures
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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
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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
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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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HUMIDIFICATION Cold weather: 0.002 # moist air / # dry air (or less)
45F at 20% RH Return air: /- 72F at 30% RH F 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
Room Temperature Humidity (Maximum) Discharge Air Temperature Must Be Chilled Water Temperature Must Be 72F 60% 57F 47F 70F 55F 45F 68F 54F 44F 66F 52F 42F 64F 49F 40F 62F 38F
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GRAPHICS Floor plans Terminal units Air handling units
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 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.
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ST. ANTHONY HOSPITAL, LAKEWOOD, CO
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HEALTHCARE BUILDING AUTOMATION
Guiding Principals, Applications and Operation Presented by Peter Sabeff
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