Sustainable School DesignCreating Healthy, High Performance School Facilities

Presented byPresented byStephen M. Koontz, Energy Services Leader, Tampa Bay TraneStephen M. Koontz, Energy Services Leader, Tampa Bay Trane

CEFPI High Performance Schools Symposium 2009

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Adv. Energy Design Guides

Collaboration of: ASHRAE AIA IESNA USGBC U.S. DOE SBIC CHPS NCEF

www.ashrae.org/freeaedg

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AEDG for K-12 School Buildings Overview

Climate-specific recommendations to achieve 30% energy savings

Promotes off-the-shelf technology (no special expertise to design/install)

Addresses whole building and the interaction of sub-systems (envelope, lighting, HVAC, service water heating)

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Can be used to achieve four points under Energy and Atmosphere Credit 1

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Chapter 3

Climate Zone Map

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Chapter 3

Recommendation Tables

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4b

smallpackagedrooftops

unitventilators

water-sourceheat pumps

Prescriptive HVAC recommendations for K-12What Type of HVAC System?

chilled-waterVAV

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Prescriptive recommendations forSix HVAC System Types

HV-1: Single-zone, packaged DX units (or split DX systems)

HV-2: Water-source (or ground-source) heat pumps with dedicated OA system

HV-3: Unit ventilators with water chiller and boiler HV-4: Fan coils with water chiller and boiler and

dedicated OA system HV-5: Multiple-zone, VAV packaged DX rooftop units HV-6: Multiple-zone, VAV air handlers with water chiller

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Climate-specific and system-specificRecommendation Tables

Unique recommendations are included for each HVAC system type in the climate-specific tables (Chapter 3)

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Climate-specific and system-specificRecommendation Tables

Some system types are not recommended for certain climate zones because of the impact of humidity on energy use

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Chapter 5Good Design Practice

Load calculations

Dehumidification

Energy recovery

Equipment efficiencies

Ventilation air

Dedicated OA systems

Economizer

Demand ventilation

Exhaust air systems

Fan motor efficiencies

System-level controls

Chilled-water system

Hot-water heating

Thermal zoning

Filters

Duct design, construction

Duct insulation

Duct sealing, leak testing

Air balancing

Commissioning

Relief versus return fans

Heating sources

Noise control

Proper maintenance

Zone temperature control

Operable windows

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HV-10HVAC Equipment Efficiencies

Recommended efficiencies based on: Climate zone HVAC system type System size (capacity) Fuel type (electricity or natural gas)

for climate zone 5

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HV-11Ventilation Air

Determine based on ASHRAE 62.1 Use actual occupancy

for calculations, not exit population

Use population diversity (D)when using multiple-zonerecirculating systems

Use time-of-day schedulesto introduce ventilation aironly when a zone isexpected to be occupied

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HV9 or HV14Energy Used to Condition OA

Because conditioning OA for ventilation is such a big contributor to energy use in K-12 schools, either exhaust-air energy recovery or demand-controlled ventilation (DCV) is recommended

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HV-8Part-Load Dehumidification

Design system to minimize number of hours that space relative humidity remains above 60%

Recommends methods for improving part-load dehumidification (by HVAC system type)

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HV-12Dedicated OA Systems

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Proper Maintenance

Neglecting preventive maintenance practices can quickly negate any energy savings expected Filters should be

replaced regularly ERVs need to be

cleaned periodically Dampers, valves,

louvers, and sensors must all be periodically inspected and calibrated

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Commissioning

Selection of commissioningauthority

Include commissioningactivities in the project schedule

Recommendedcommissioningactivities

Advanced Energy Design Guidefor K-12 School Buildings

www.ashrae.org/freeaedg