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Transcript of Today’s Webcast starts at 1:00 p.m. Eastern. - · PDF fileToday’s Webcast starts...
Today’s Webcast starts at 1:00 p.m. Eastern.
You will not hear audio until the Webcast begins
Today's Moderator
Dave Lubach Associate Editor
Facility Maintenance Decisions
Today's Presenter
Meghan Quinn, PE
Senior Associate, Syska Hennessy
Meghan Quinn is a Senior Associate of Syska Hennessy Group, Inc. and Supervising Engineer in the Los Angeles office. With more than 13 years of specialized professional engineering and design experience, Meghan is acknowledged as a client asset through her work on high-profile projects: Columbia Square in Hollywood, CA and The Huntington Botanical Gardens Entrance Complex in San Marino, CA. Recognized as an innovative mechanical engineer, Meghan offers comprehensive insights of the industry and leverages her experience to deliver a quality product that eases the client experience. Meghan holds a Bachelor of Science with a focus on mechanical engineering from University of Connecticut. She is a registered Professional Engineer in California, published author and presenter.
Learning Objectives:
• Review VRF technology and features
• Analyze the differences between air- and water-cooled VRF units
• Understand the impact of ASHRAE 62.1 on VRF specification and installation
• Discuss how to specify VRF units according to building features and use
To ask questions: Please use the question and answer panel on the right-hand side of the
screen, and send to all panelists.
Polling Questions Todays webcast will include multiple choice polling questions. Your
participation is appreciated.
Presentation Handouts All participants will receive an e-mail by the end of the day with a link to
download a PDF copy of today’s presentation slides.
CEU Information
Trade Press Media Group has been accredited as an authorized Provider by the International Association for Continuing Education and Training (IACET), 1760
Old Meadow Road, Suite 500, McLean VA 22102; (703) 506-3275
To successfully earn 0.1 CEUs, you must attend the entire webcast and earn a 70% or higher on the assessment.
VRF Technology Presented by Meghan Quinn, PE
9/27/16
• VRF/VRV
What is VRF?
Variable Refrigerant Flow (Volume)
Heat Pump vs. Heat Recovery
Air Cooled vs. Water Cooled
9/27/16
VRF Components
Condensing Unit
Ceiling Register FCU
Wall Mounted FCU Ducted FCU
Selector Box
Refrigerant Piping
9/27/16
• VRF Pros and Cons
• Pros:
Zoning/Temperature Control
Energy Savings
Acoustics
Water Conservation (Air Cooled)
• Cons:
Not the “Traditional” HVAC Solution
High quantity of refrigerant in system
Building height limitations
Restrictions with core shell/TI designs
9/27/16
• Zone/Temperature Control
9/27/16
• Benefit - Energy Savings
• High Efficiency
• Lower Pump Energy
• Heat Recovery
• Energy Recovery Ventilator
9/27/16
Heating only or Cooling only – All Zones Same Mode
Heat Pump
Cooling
Cooling
Cooling
Cooling
9/27/16
Synchronous cooling and heating in different zones
Cooling Heating
Cooling Heating
Heat Recovery
9/27/16
Outdoor Air
Indoor Air
Supply Air Exhaust Air
Energy Recovery Ventilator
9/27/16
• VRF Considerations in Building Design
Ventilation Strategies
Component location – piping restrictions
Location of Equipment
Core & Shell vs. TI
9/27/16
OSA Unit
SA SA
Delivered Adjacent
to the Fan Coil Unit
Delivered Directly
to the Fan Coil Unit
Delivered Directly
to the Zone
• Ventilation Strategies
9/27/16
Piping Limits
• Total elevation
• Maximum separation between indoor units
• Maximum distance between first branch and farthest indoor unit
• Total piping length
Piping Installation
• Insulate piping
• Piping installed level
• Refrigerant Piping
9/27/16
• Refrigerant Piping – ASHRAE 15
Step 1: Calculate Total lbs of Refrigerant
Largest Circuit – Not sum of all circuits
Each type of Refrigerant
Step 2: Calculate Space Volume for Dilution
Volume of Smallest occupied space
Include plenums, rooms, corridors if permanently connected
Step 3: Compare to RCL
9/27/16
• Step 3 – Compare lbs/1000 ft3
R-410a - ASHRAE Standard 34-2013: RCL = 26 lbs/1000 ft3
What if Charge exceeds RCL?!…
Reduce refrigerant or dilute by increasing space volume
9/27/16
Polling Questions Todays webcast will include multiple choice polling questions.
Please make your selections to the right of this screen.
• Air Cooled vs. Water Cooled
Air Cooled VRF
Uses the Atmosphere
Needs no water
Restrictions on piping limits
Water Cooled VRF
Uses water as heat transfer medium
Ancillary Equipment needs higher pressure rating
Condensing units can be located inside
9/27/16
Air Source system Water Source system
Air Cooled vs. Water Cooled
9/27/16
Water Cooled Applications
Multi V Outdoor Unit
Mid temperature
High temperature
Indoor Unit Hot Water
Storage Tank
9/27/16
• Locating Equipment – Air Cooled
Exterior Units
Condenser Units
OSA Units
Interior Units
Branch Selector Boxes (BSB’s, BCB’s, etc)
Fan Coil Units
9/27/16
• Locating Equipment – Water Cooled
Exterior Units
Cooling Tower
Boiler
OSA Units
Interior Units
Branch Selector Boxes (BSB’s, BCB’s, etc)
Fan Coil Units
Condensing Units (if water cooled)
9/27/16
• VRF Applications
Large Offices
High Rise Residential
Core & Shell – TI Fit-outs
9/27/16
Large Office Buildings
• Interior & Exterior zones
• Individualized zones/comfort
• Tenant fit-out post construction
9/27/16
High Rise Buildings
• Limited roof space
• Modular equipment
• Multiple tenants
• Tenant fit-out post construction
9/27/16
Installed - Condenser Farm
9/27/16
Installed - Refrigerant Piping
9/27/16
• Lessons Learned
Specifying Units
Manufacturer Differences
Warranty Lengths
Energy Modeling
Metering
9/27/16
QUESTIONS?
9/27/16