Commercial HVAC. Emerging Technologies
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1 Commercial HVAC Showcase Commercial HVAC Webinar #2 April 14, 2015 Welcome. Today s webinar is being recorded and will be posted at: 1
2 GoToWebinar Logistics Minimize or maximize control panel Phone lines are muted Please use question pane to ask questions during Q & A or if you have any technical issues NOTE: Today s presentation is being recorded and will be available at within 48 hours 2
3 Variable Capacity Heat Pumps (VCHP VRF, VRV, DHP ) Variable Refrigerant Flow Systems (VRF) Variable Split System Heat Pumps Jonathan Heller Ecotope April 14, 2015
4 Presentation Overview Variable Refrigerant Flow Systems (VRF) and Variable Split System Heat Pumps 1. Present Range of VCHP Equipment 2. Present Features of VCHP that Enable Highly Efficient System Designs 3. Case Studies of Efficient and Inefficient Buildings 4. Make Case for Design-based Savings as Opposed to Widget-based Savings for VCHP Systems
5 Variable Capacity Heat Pumps (VCHP) 1. Outdoor Compressor Unit 2. Refrigerant distribution System 3. Indoor Heating/Cooling Dist. System
6 Outdoor Compressor Units
7 Refrigerant Distribution System R-410a
8 Heat Recovery 2 vs. 3-pipe
9 Indoor Units
10 Fan Coil Use (Fan Watts for delivery of 8000 Btuh cooling) Watts PSC Fan Coil ECM Fan Coil VRF Wall Cassette VRF Ceiling Cassette VRF Floor Cassette Fan Coil Type 85 VRF Low VRF Medium Profile Static Ducted Ducted
11 Variable Speed Split System Heat Pumps
12
13 Electric Heat and Duct Losses Box Only COP ~ 2.7 vs % Improvement System COP ~ 1.8 vs % Improvement
14 R-410a: No Need for Back-up or Reheat
15 Move Away from Large Central HVAC Systems
16 Towards Smaller Zonal Systems
17 Move Away from All-In-One HVAC Systems
18 Towards Dedicated Ventilation Systems
19 Right-Size Mechanical Systems
20 Smaller Equipment
21 EUI of Seattle Fire Stations 200 Seattle Median (97) kbtu/sf-yr
22 Why are New Stations so Inefficient? Continuous ducted central fan systems Ventilation at 3x ASHRAE 62 No heat recovery, electric heat on ventilation air
23 EUI: kbtu/sf-yr Ecotope Case Studies CBECS 2008 CBSA 1980s MPR Baseline KCHA RFM
24 Rice Fergus Miller Office: Bremerton, WA EUI = 21
25 Now What?
26 Load Reduction Measures Insulation Daylighting VRF Heat Pumps Heat recovery ventilation Operable windows Passive/Active
27 Non-Heat Recovery Heat Pump
28 Fan Load Reduction: Ceiling Fans vs. Ducts to Move Air
29 End Use Reductions Cooling 70 Heating 60 Pumps 50 Fans 40 DHW 30 Lights Ext Usage 20 Plugs, Elev, Misc CBECS Avg. Office RFM
30 Smaller Mechanical Systems Heating Load ~ 12 tons (1350 sf/ton) Cooling Load ~ 22 Tons (850 sf/ton)
31 Construction Costs breakdown ($/sf) Fire Protection $1.97 Electrical $17.11 HVAC $9.75 Everything Else $71.34 Plumbing $4.83
32 LEED Platinum EUI = 21
33 King County Housing Authority: Tukwila, WA EUI = 26
34 1980 s Level Envelope R-11 Walls R-20 Roof Uninsulated Slab U-0.4 Double Glaze
35 No Economizers
36 No Direct Digital Controls
37 High Lights & Plugs
38 2-Pipe VRF with Heat Recovery 48 Tons 3 Outdoor Units 36 Ductless Units 14 Ducted Units 50 Zones Total 1.33 Ratio Indoor/Outdoor Units
39 DOAS via High ERV
40 High Performance, Low Cost End Use (EUI 26 kbtu/sf-yr) Heat 12% KCHA Construction Budget ($95/sf) Cool 7% HVAC, $14 Electric, $13 Lights 32% ERV Fans 6% Other, $64 Misc. 15% Computers 28% Plumbing, $2 Fire, $2
41 System Comparison (KCHA)
42 Summary Variable Speed Splits Savings Non- Benefits Technology Readiness Ease of Adoption Value
43 Summary VRF Savings Non- Benefits Technology Readiness Ease of Adoption Value
44 EUI (kbtu/sf-yr) Savings Lights, Plugs, Misc. HVAC CBECS Avg. Office 7 26 Seattle Avg. Office 19 KCHA 4 18 Rice Fergus Miller Office ** Design-Based vs. Widget-Based Approach
45 Non- Benefits Smaller equipment and distribution systems possible. Enables lower floor-to-floor heights and easier retrofit. Greater individual zone control possible Pre-manufactured systems allow for easier installation, coordination, commissioning Quiet
46 Technology Readiness
47 Ease of Adoption
48 Value
49 Questions? Jonathan Heller Principal Engineer Ecotope 49
50 GoToWebinar Logistics for TAG Members Minimize or maximize control panel ComTAG members choose telephone and dial using the info provided Mute your phone when not speaking Click on the hand icon when you want to ask a question Please use question pane to ask questions during Q & A or if you have any technical issues 50
51 Criteria 1) How significant and reliable are the energy savings per unit? 2) How great are the non-energy advantages for the end user for adopting this technology? 3) How ready are the products(s) and providers to scale up for widespread use in the Pacific Northwest? 4) How easy is it for the end user to change to the proposed technology? 5) Considering all costs and all benefits, how good of a buy is this technology for the owner? 51
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