Presentation on theme: "HEALTHCARE BUILDING AUTOMATION"— Presentation transcript:
1HEALTHCARE BUILDING AUTOMATION Guiding Principals, Applications and OperationPresented by Peter Sabeff
2SIMILAR, BUT MORE Commercial Buildings Temperature control Building pressure controlOccupied/Unoccupied controlWarm up/cool down
3SIMILAR, BUT MORE Healthcare The above (Commercial Buildings), plus Space & pressure relationshipsHumidity controlLess influenceWarm up/cool down
4HEALTHCARE CHALLENGES Humidity Control – Humidification & DehumidificationAir QualitySpace & Building PressurizationOptimization – AHU and Plant Equipment
5HEALTHCARE MONITORING AND CONTROL ISSUES Understand the systems – terminal units, AHU, plantEquipment over/under sizingInteractions between temperature, pressure, flow and humidity controlVariable everything – good and bad
6HEALTHCARE MONITORING AND CONTROL ISSUES Unwanted gains and lossesHumidifier heat (jacketed humidifiers)Reheat coil heat migrationOverlapping sensing and control of components in seriesFan heatOutside air heat – roofs, hot exhaust air, condensing unitsControl component failuresLack of outside/return air mixingPreheat coil overshoot
7HEALTHCARE MONITORING AND CONTROL ISSUES Building pressurizationSignificant exhaust air – constant and variableMany entrances/exits – high pedestrian trafficOutside air control/conditioning issues – freezing, high humidityControl strategies?
8HEALTHCARE MONITORING AND CONTROL ISSUES Room ControlCentral cooling source - 55F +/- discharge airIndividual heating controlThermostat locationOccupied/Unoccupied – how do we know?Occupant thermostat manipulationZoning
9HEALTHCARE MONITORING AND CONTROL ISSUES RedundancyAutomatic backup with failuresEquipment interactions with pump failures
10INSTRUMENTATION – THE STEPS DDC monitoring and controlValidation of I/O accuracyValidation of sequences of operationValidation of programming – normal, off normal, failureSystem interactionsIntegrated system interactionsTighten the beltRepeat steps 1 through 7 until satisfied and energy use confirms success
11MONITORING Temperature and Humidity Pressures HW/CHW differential Room tempsTerminal unit functionsAHU functionsPlant functionsPressuresAHU – internal/externalHW/CHW differentialRooms/positive - negativeBuilding – positive/negative/wind
12MONITORING Flows Minimum/Maximum – OSA , Chillers, VAV Tracking Global Outside air temperature and humidityOperating schedulesBuilding electric demand (main meter)System electric demand (aggregate equipment)
18HUMIDIFICATION Cold weather: 0.002 # moist air / # dry air (or less) 45F at 20% RHReturn air: /-72F at 30% RHF at 20% RHEconomizer free cooling – cold/dry air adds humidification loadHumidifier sizing – Min or max OSA?
19OR HUMIDITY VIA COOLING/CONDENSING RoomTemperatureHumidity(Maximum)DischargeAir TemperatureMust BeChilledWaterTemperature Must Be72F60%57F47F70F55F45F68F54F44F66F52F42F64F49F40F62F38F
20GRAPHICS Floor plans Terminal units Air handling units BasicFloor plansTerminal unitsAir handling unitsHeat exchangers/pumpingChilled waterCondenser water
21GRAPHICSEnhancedAHU discharge temp, CHW valve pos, CHW S & R temps, powerSystem Power Consumption – pumps + fans + compressors + etc.
22DATA MINING Adds intelligence to BAS trending 3rd party overlay General or operator directedLarge capacity/long durationExperience based mining / correlation of dataMust have the I/O
23DATA MINING Sequencing of components that function in series Hi and Lo limitsOccupied/UnoccupiedStarting is easy – when do we stop?Riding it outMake one change at a time.