vrf systems for school applications - fefpa in... · · 2017-03-12vrf systems for school...
TRANSCRIPT
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
2
• VRF – Variable Refrigerant Flow
• System Components:
What is VRF?
5
Condensing Units
Mode Selection Box
Indoor Units
Controls & Acc.
What is VRF?
6
Variable Speed Capacity • All-inverter compressors
• No Locked Rotor Amps or Maximum Starting Current
• Reduced wear and tear extends life
• Reduced sound levels
• Energy efficiency
What is VRF?
10
Three Pipe Refrigerant Circuit
Two Pipe Refrigerant
Circuit
Large Conference
Open Office PlanOffice Office
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
11
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
12
• Inverter compressor
• Simultaneous cooling and heating
• No water circulating pumps
Energy Savings
13
Four-Pipe Application
VRF Application
• VRF energy model simulation for school
o Single Story
o 82,000 square feet
o Comparison: VRF, WSHP, VAV Rooftop, 4-Pipe Hydronic
o Classrooms, Administrative, Labs, Gym, Locker Rooms, Labs and Theater
o Various Climate Regions
oAtlanta, Miami, Boston, New York, Chicago, Dallas, Los Angeles, Seattle
o Utility rates were used based on historic data per region
VRF Energy Efficiency
18
Source: EnergySoft Building Analysis – Energy Pro Modeler
VRF Energy Efficiency
19
$0
$50,000
$100,000
$150,000
$200,000
$250,000
Atlanta Miami Boston NYC Chicago Dallas L.A. Seattle
VRF VAV WSHP 4-Pipe
Total Energy Cost ComparisonUp to 33% less
Source: EnergySoft Building Analysis – Energy Pro Modeler
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
20
Design Flexibility
22
Indoor Units
Wall Mount 2x2 Ceiling Cassette
3x3 Ceiling Cassette Ceiling/Floor Mounted
Medium Static High StaticVertical/Horizontal
Non Ducted
Ducted
• Modular system design approach
Design Flexibility
23
07 09 12 15 18 24 30 36 48 54 72 96
6 8 10 12 14 16 18 20 22 24 26 28 36
HR
HP
23
VRF and Existing Buildings
• Less intrusive to existing architecture
• Small refrigerant piping instead of large ductwork
• Outdoor installation flexibility
• Traditional systems require space for pumps, boilers, chillers, ducts, piping, heat exchangers
• VRF systems free up space and modular design are easily blended into design
Reclaimed Design Space
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
27
• Equipment handling – no cranes (fits in standard freight elevator), less weight on roof
• Small footprint/modular – eliminate need for equipment room (more usable space)
Cost Effective Installation
28
Scalable system capacity
• R410A Vs Water
8.9 Btu/h per lb vs. 85 Btu/h per lb -> 10x more effective
• R410A Vs Air
0.48 Btu/h per lb vs. 85 Btu/h per lb -> 170x more effective
Cost Effective Installation
30Cross sectional area. Does not include duct or pipe insulation
Typical 20 Ton System
28.27 in2
10 X Larger
8.9 Btu/h per LB
2.82 in2
85.4 Btu/h per LB
800 in2
284 X Larger
0.48 Btu/h per LB
40” X 20”
Rectangular Duct
24”
4-Pipe Chiller/Boiler
(Four 3” Pipes)
3-Pipe VRF
Heat Recovery
(Suct.-1.25”,
Disch.-1.125”,
Liq.-.875”)
• Average equipment weight per ton for VRF is 70 lbs per ton (outdoor unit only)
• Average equipment weight per ton for water-cooled chiller is 101 lbs per ton
VRF Equipment Weight Savings
31% reduction in equipment weight80 Ton System
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
32
Occupant Environment
33
• Each VRF Indoor Unit has its own electronic expansion valve (EXV)
• Each IDU makes a system capacity demand based setpoint/room temp differential
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
35
1. IDU filter cleaning
2. Annual ODU coil cleaning
-----------That’s it!------------
• NO belt maintenance - Direct drive
• Single 6/8/10 ton compressor SKU – in stock
• Single manufacturer, single source responsibility
• Self-diagnostic, alpha numeric error code generation
• Emailed and/or text message error alerts to maintenance staff
Virtually No Maintenance
36
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
38
Comfort Controls
Centralized Controller
41
On/Off
Fan Speed
Setpoint
Mode
BACnet LON Works
Multiple Buildings on Campus
• What is VRF?
• Why VRF in Schools?
Energy Efficiency
Design Flexibility
Cost Effective Installation
Occupant Environment
Ease of Maintenance
Ease of Control
• Wrap up
VRF in Schools
42
• VRF is the most comfortable technology on the market, due to variable capacity indoor units, variable speed outdoor units
• Systems are available as Heat Pump and Heat Recovery
• VRF is a globally proven technology for 30+ years
• Highly energy efficient – Energy can recovered and recycled
• Application flexibility
• Maintain consistent space temperature for better felt comfort
• Low sound levels – great for classrooms
• Local and centralized control – campus wide control, local lockouts
Wrap Up
43