Wittichen Supply Co.

Transcription

Wittichen Supply Co.
Progressive Energy, Environment & Sustainability Summit
Chicago
September 11 - 13, 2011
Extreme Efficiency:
Variable Capacity Air Conditioning Systems
Mark T. Kuntz
mkuntz@hvac.mea.com
630-562-9272
Topics
Variable Capacity vs. conventional HVAC
Residential, Multizone & Commercial Systems
Cold climate heating capabilities
EPRI VRF field test program
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Variable Capacity =
“Ductless”, “Mini-Split”, etc.
33-7/16
inches
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Variable Capacity versus Conventional
Little or no ductwork = minimizes duct leakage
Individual room control
Extremely quiet
Fast and easy to install and service
Exceptional energy efficiency
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Variable Capacity versus Conventional
 INVERTER Compressor Advantages
 Over-sizing not an issue!
 Output matches load requirements
 Comfort levels are reached quickly
 Extremely low sound levels from both fan and
compressor
 Constant circulation of conditioned air
 Improves humidity control
 Reduces hot/cold pockets
 Warm air delivery at start up in heating mode
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DC Compressor
Indoor Comfort Flexibility
Wall-mounted unit
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Ceiling-suspended unit
Floor standing unit
Indoor Comfort Flexibility
4-way large
cassette
4-way small
cassette
1-way cassette
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Indoor Comfort Flexibility
Medium static ducted unit
High static ducted unit
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Low-profile ducted unit
Vertical ducted unit
Residential Multizone Solutions
 2 to 8 indoor units
 20,000 – 48,000 BTUH
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Commercial Multizone Solutions:
Variable Refrigerant Flow (VRF)
Simultaneous cooling and heating
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Space Savings
Space Required to Deliver 20 tons of Cooling
VRF 20 tons
Ducted 20 tons
30″ Round Supply Duct
11/8″ Liquid
11/8″ Gas
Chilled Water
20 tons
3″ CHW supply
3″ CHW return
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Ducted 20 tons
40″ x 20″ Supply Duct
Equipment Weight Savings
Average equipment weight per ton is 70 lbs
per ton (outdoor unit only)
Average equipment weight per ton for watercooled chiller is 101 lbs./ton
31% reduction in equipment weight
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Installation Flexibility
Water Cooled
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Air Cooled
Installation Flexibility
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VRF and Existing Buildings
• Less intrusive to existing architecture
• Small refrigerant piping instead of large ductwork
• Outdoor installation flexibility
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Utilizing VRF with LEED
 Energy and
Atmosphere: VRF Can
achieve up to 21 points
 Environmental Quality:
VRF can achieve up to
seven points
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LEED NC 3.0
 Certified: 40-49 points
 Silver: 50-59 points
 Gold: 60-79 points
 Platinum: 80 + points
VRF Systems and Energy Modeling
• Energy usage and cost for
the VRF systems can be
modeled using EnergyPro
EnergyPro uses DOE2.1e to
model and compare VRF to
other HVAC system
• EnergyPro is approved for
use with LEED EAc1
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Cold Climate Heating: Hyper Heat
 System re-collects heat
energy that is normally
wasted at the outdoor
coil.
 Process cools the
compressor, allowing
higher speeds at lower
outdoor temperatures.
 Provides full heating
capacity and
comfortable discharge
air temperatures at low
outdoor temperatures.
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Cold Climate Heating: Hyper Heat
120
100
100% @ 5o F
80
87% @ -4o F
60
80% @ -13o F
40
20
0
-13
-4
0
5
10
17
25
30
35
40
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Mitsubishi Electric Hyper-heat INVERTER (H2iTM)
Mitsubishi Electric Standard INVERTER Heat Pump system
Typical Unitary Equipment
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EPRI Energy Efficiency Demonstration
-VRF Installations
Operating Site
Planned Site
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4'
Faith Academy—Mobile, AL Instrumentation Schematic
4'
31'
ModHopper
ROOM 1
ROOM 2
ROOM 3
ROOM 4
120 VAC
above ceiling
ROOM 5
ROOM 7
ROOM 6
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ROOM 8
POWER
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32'
2, 18
1, 17
4, 20
3, 19
5, 21
6, 22
7, 23
8, 24
15'
Building
2Control
CAT-5 (1 pair)
Power
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GIRLS
BOYS
GIRLS
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34
35
36
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Enclosure
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Flow
VRF
24vdc
Power
Supply
Flex I/O
271'-0"
4'
BOYS
120 VAC
120 VAC
above ceiling
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31'
POWER
ROOM 9
ROOM 10
ROOM 11
ROOM 12
ROOM 13
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BAPI wireless Temp.
and RH Transmittor
32'
45
9, 25
10, 26
11, 27
12, 28
15'
ROOM 16
Belden 8451 Signal Wire
6
15, 31
14, 30
Static IP Address
BOYS
Carbon Dioxide
Transmitter
GIRLS
271'-0"
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ROOM 15
ROOM 14
13, 29
Building
3 - VRF
GIRLS
AS
Data Log.
31'-11 15/16"
4'
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Figure 1—Field Test Layout
BOYS
16, 32
Figure 3—Indoor Ceiling Cassette
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Figure 2—24 Ton VRF Outdoor Unit
Refrigerant Flow Meter
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Table 1--VRF Performance at Mobile, AL
-Monthly Energy Summaries, 2010
April
September
Base Total Energy:
VRF Total Energy:
Savings (Base – VRF):
690kWh
469kWh
221kWh
Base Total Energy:
VRF Total Energy:
Savings (Base – VRF):
4848kWh
2812kWh
2036kWh
% difference
-32%
% difference
-42%
October
May
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Base Total Energy:
VRF Total Energy:
Savings (Base – VRF):
3618kWh
2351kWh
1266kWh
Base Total Energy:
VRF Total Energy:
Savings (Base – VRF):
2928kWh
1607kWh
1322kWh
% difference
-35%
% difference
-45%
Figure 4—Power Profiles for September 17, 2010
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40
Outdoor Temperature
90
Indoor Average Temperature
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VRF Hour Average Power
Baseline Hour Average Power
30
80
25
75
20
70
15
65
10
60
5
55
0
12:00 AM
3:00 AM
6:00 AM
9:00 AM
12:00 PM
Time
25
3:00 PM
6:00 PM
9:00 PM
12:00 AM
Power (kW)
Temperature (F)
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Re-Cap: Benefits of Variable Capacity
Systems
Space Utilization
 Installation flexibility to meet building space requirements
 Minimal impact to existing building architecture and structure
Occupant Comfort
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


Individual comfort control
Indoor unit flexibility to meet the needs of any space
Meets occupant ventilation air requirements
Quiet operation
Energy Savings
 Inverter driven compressor
 No wasted heat; cold climate capable
 Meets requirements for LEED points
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Thank you for your time!
Questions?
www.mehvac.com
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