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1 Today s Webcast starts at 1:00 p.m. Eastern. You will not hear audio until the Webcast begins
2 Today's Moderator Dave Lubach Associate Editor Facility Maintenance Decisions
3 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.
4 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
5 To ask questions: Please use the question and answer panel on the right-hand side of the screen, and send to all panelists.
6 Polling Questions Todays webcast will include multiple choice polling questions. Your participation is appreciated.
7 Presentation Handouts All participants will receive an by the end of the day with a link to download a PDF copy of today s presentation slides.
8 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) To successfully earn 0.1 CEUs, you must attend the entire webcast and earn a 70% or higher on the assessment.
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15 VRF Technology Presented by Meghan Quinn, PE
16 VRF/VRV What is VRF? Variable Refrigerant Flow (Volume) Heat Pump vs. Heat Recovery Air Cooled vs. Water Cooled
17 VRF Components Ceiling Register FCU Selector Box Wall Mounted FCU Ducted FCU Refrigerant Piping Condensing Unit
18 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
19 Zone/Temperature Control
20 Benefit - Energy Savings High Efficiency Lower Pump Energy Heat Recovery Energy Recovery Ventilator
21 Heat Pump Heating only or Cooling only All Zones Same Mode Cooling Cooling Cooling Cooling
22 Heat Recovery Synchronous cooling and heating in different zones Cooling Heating Cooling Heating
23 Energy Recovery Ventilator Outdoor Air Indoor Air Exhaust Air Supply Air
24 VRF Considerations in Building Design Ventilation Strategies Component location piping restrictions Location of Equipment Core & Shell vs. TI
25 Ventilation Strategies OSA Unit SA SA Delivered Adjacent to the Fan Coil Unit Delivered Directly to the Fan Coil Unit Delivered Directly to the Zone
26 Refrigerant Piping 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
27 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
28 Step 3 Compare lbs/1000 ft 3 R-410a - ASHRAE Standard : RCL = 26 lbs/1000 ft 3 What if Charge exceeds RCL?! Reduce refrigerant or dilute by increasing space volume
29 Polling Questions Todays webcast will include multiple choice polling questions. Please make your selections to the right of this screen.
30 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
31 Air Cooled vs. Water Cooled Air Source system Water Source system
32 Water Cooled Applications Hot Water Storage Tank Indoor Unit High temperature Multi V Outdoor Unit Mid temperature
33 Locating Equipment Air Cooled Exterior Units Condenser Units OSA Units Interior Units Branch Selector Boxes (BSB s, BCB s, etc) Fan Coil Units
34 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)
35 VRF Applications Large Offices High Rise Residential Core & Shell TI Fit-outs
36 Large Office Buildings Interior & Exterior zones Individualized zones/comfort Tenant fit-out post construction
37 High Rise Buildings Limited roof space Modular equipment Multiple tenants Tenant fit-out post construction
38 Installed - Condenser Farm
39 Installed - Refrigerant Piping
40 Lessons Learned Specifying Units Manufacturer Differences Warranty Lengths Energy Modeling Metering
41 QUESTIONS?
Today s Webcast starts at 1:00 p.m. Eastern. You will not hear audio until the Webcast begins
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