Stephen Hamstra, P.E. ASHRAE HBDP & Dis<nguished Lecturer Fellow AEE, CGD, LEED-­‐AP President Greensleeves LLC [email protected] Real-World Geothermal:
Design, Control and Monitor-based
Optimization
or
“Let’s change the game…”
Greensleeves LLC 1 Outline/Agenda
•  Game Changer? Really?
•  Real-time v. Predictive Controls
•  Examples
Greensleeves LLC 2 Why different do we need a different
approach?
GSHP Systems are not equivalent to boilers and chillers. The difference is the “thermal flywheel” that we charge and discharge. This creates opportuni<es not available with “real <me” systems. Greensleeves LLC 3 Today’s disconnected approach
Design Create Construc/on Documents Walk away and hope it works as designed Commission System (?) Manually Program BAS = Handoff or technology change Greensleeves LLC 4
Shown another way…
Engineer Engineer Energy Model Engineer Control Spec’s GHX Design Bidding and Award Process + SubmiVals BAS Contractor Programming BAS BAS Contractor Cx BAS BAS Contractor Sta<c, Reac<ve Sequences Re-­‐Cx? What if the “real” HVAC loads, weather, building schedule, GHX Performance, etc. don’t match design or just plain change??? Greensleeves LLC 5
Let’s Change the Game…
Op/mize Design Create Control Intelligence Op/mize Control Intelligence = Digital Connec<on Load & Performance Analy/cs Model-­‐based Cx Greensleeves LLC 6
Process Summary
•  Design
–  Import loads from 8760 hour energy model
–  Define desired optimization outcome
–  Create hybrid design & automatically create control language
•  Control
–  Download control software & expose BAS points
–  Model-based commissioning process
–  Predictive, self-healing controls
•  Performance feedback
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Controls Comparison
•  Traditional Approach
–  EOR provides Points List and Sequence of Operation
–  BAS Technician “codes” sequence into PLC
–  Extensive debugging and Cx Processes
–  Fixed/static sequence; does not change
•  Integrated Approach
–  Control code in M2M language directly from simulation
–  Download to local BAS, expose points via BACnet, etc.
–  Remote Cx and diagnostics
–  Tracks GHX loads, adapts control algorithms to optimize
–  Future failure alert and can “fix” failed borefields!
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INTEGRATE THE PROCESS
Confiden<al Greensleeves LLC 9
Trane TRACE 700 File Support
TRACE 700 can now create a “Greensleeves” file with hourly hea<ng/cooling loads plus Engineer’s hourly weather data (.TMY). Greensleeves LLC 10
Trane TRACE 700 File Support
T700simsecngs checked for Greensleeves: –  While in TRACE (Project Navigator) hit “CTL + ALT + T”, this will open a new window –  Double click “T700SimSecngs.exe” –  Check the box for “Greensleeves Geothermal Report” and click OK Greensleeves LLC 11
Trane TRACE 700 File Support
There will now be a .csv file in the project folder (the folder where the .trc file resides). The naming conven<on is ‘file_name’.GS’alterna<ve_number’.csv. For example, if you have a file name called “Greensleeves.trc” the output will be “Greensleeves.GS1.csv”. The first file extension refers to the alterna<ve, e.g. GS1 for Alt 1, GS2 for Alt 2, etc. Greensleeves LLC 12
THE CONTROLS REVOLUTION
Confiden<al Greensleeves LLC 13
Hybrids can take many forms
Weather condi<ons U<lity Rate Structure Forecasted Loads Historical Performance Self-­‐Adap<ng Self-­‐Healing * CC Cooling Towers & Dry Coolers n munica<o
Data Com
HEAT
FER
TRANS
Building Automa/on System HEAT
TRANSFER
Mass Tank/ Thermal BaQery HEAT
TRANSFER
HEAT
TRANS
FER
Geo. Heat Pumps Geothermal Earth Heat Exchanger HE
TRA AT
NSF
E
R
*: Indicates currently in Greensleeves simulator. Rest are in process. Bodies of Water * CHP & Emergency Power Systems Solar Thermal Systems Heat Exchangers to Sewer or Irriga/on systems * “ASHRAE” Hybrid?
•  Add a closed-circuit cooling tower (CCCT) to handle peak
cooling loads when the loop temperature exceeds a
setpoint (85⁰ F)
•  Add a boiler to handle loop temperatures below 45⁰ F if
no antifreeze is present
•  Either device operates on a REAL TIME basis
•  But by definition, real time (when the loads are highest) is
typically the least efficient time to run a CCCT
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Intelligently Shift Operation of Heat Rejection
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EXAMPLES
Confiden<al Greensleeves LLC 17
56°F
70°F
65°F
Full-­‐sized GHX ASHRAE Hybrid GS Hybrid GHX Borefeet & % Change 81,000 BF 45,000 BF (-­‐44%) 28,000 BF (-­‐65%) CCCT Size No CCCT 188 Tons 125 Tons HVAC Op Cost $ 44,000 $ 48,000 $ 45,000 1st Cost GHX + CCCT $1,053,000 $654,156 $413,000 1st Cost Reduc<on Base $399,000 (38%) $640,000 (61%) Greensleeves LLC New Construc<on Greensleeves Avg ASHRAE Hybrid Fullsize GeoThermal EWT
Avg EWT
Avg EWT
18
Greensleeves Avg ASHRAE Hybrid Fullsize GeoThermal EWT
Avg EWT
Avg EWT
78°F
Full-­‐sized GHX GS Hybrid GHX Borefeet & % Change 65,910 BF 12,000 BF (-­‐82%) CCCT Size No CCCT 300 Tons HVAC Op Cost $ 26,500 $ 26,000 1st Cost GHX + CCCT $1,000,000 $300,000 1st Cost Reduc<on Base $700,000 (70%) Greensleeves LLC New Construc<on 60°F
19
Greensleeves Avg ASHRAE Hybrid Fullsize GeoThermal EWT
Avg EWT
Avg EWT
81°F
79°F
Full-­‐sized GHX ASHRAE Hybrid GS Hybrid GHX Borefeet & % Change 50,400 BF 35,370 BF (-­‐30%) 16,800 BF (-­‐67%) CCCT Size No CCCT 75 Tons 75 Tons HVAC Op Cost $ 15,600 $ 17,700 $ 19,000 1st Cost GHX + CCCT $756,000 $567,000 $287,500 1st Cost Reduc<on Base $189,000 (25%) $468,500 (62%) Greensleeves LLC New Construc<on 70°F
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Greensleeves Avg ASHRAE Hybrid EWT
Avg EWT
89°F
ASHRAE Hybrid GS Hybrid GHX Borefeet & % Change 120,000 BF 100,000 BF CCCT Size 735 Tons 300Tons HVAC Op Cost $ 50,000 $ 28,500 (-­‐43%) 1st Cost GHX + CCCT $2,000,000 $1,600,000 1st Cost Reduc<on Base $400,000 (20%) Greensleeves LLC New Construc<on 71°F
21
Greensleeves Avg ASHRAE Hybrid Fullsize GeoThermal EWT
Avg EWT
Avg EWT
77°F
75°F
Full-­‐sized GHX ASHRAE Hybrid GS Hybrid GHX Borefeet 120,000 BF 72,800 BF 64,000 BF CCCT Size No CCCT 350 Tons 350 Tons HVAC Op Cost $ 24,233 $ 28,250 (+17%) $ 24,400 (+0.6%) 1st Cost GHX + CCCT $ 2,640,000 $1,215,000 (-­‐54%) $1,085,000 (-­‐59%) Greensleeves LLC New Construc<on 61°F
22
Greensleeves Avg ASHRAE Hybrid Fullsize GeoThermal EWT
Avg EWT
Avg EWT
85°F
90°F
Full-­‐sized GHX ASHRAE Hybrid GS Hybrid GHX Borefeet 18,450 BF 18,450 BF 18,450 BF CCCT Size No CCCT 45 Tons 36 Tons HVAC Op Cost $ 17,000 $ 17,000 (-­‐0%) $ 15,000 (-­‐12%) 1st Cost CCCT No CCCT $27,000 $22,000 (-­‐18%) Greensleeves LLC Borefield Rescue 69°F
23
Borefield Rescue Greensleeves LLC 24
Borefield Rescue Greensleeves LLC 25
Borefield Rescue Greensleeves LLC 26
SUMMARY
Confiden<al Greensleeves LLC 27
What’s Available Now?
•  Trane TRACE 700 Greensleeves file + support for HAP,
IES VE, EnergyPlus, etc.
•  Early adopter phase – we receive your files, run the
simulations and return results to you, just VGHX + CCCT
configuration initially
•  Phased rollout of online storefront and NET computer
access to Cloud-based tools
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Phased Rollout
•  Q4 2014 We run files for users, test the online store
and tools
•  Q1 2015 Online store up, Engineers running our
software in the Cloud, engineers get access to their
projects’ performance data online
•  Q1-Q3 2015 Addition of more reports and system
configurations
•  IGSHPA 2016 Goal: introduce entirely new and currently
unavailable set of tools for our industry
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Greensleeves patents filed in “blue” countries Greensleeves LLC 30
Benefits
•  Engineers & Geo Designers
–  shorter design phase with better designs
–  lower 1st and energy costs
–  less risk
–  Performance feedback, maintain client contact
•  BAS Contractors – less programming, debugging, Cx
•  GHX Contractors – more projects go GSHP
•  GSHP Equipment Mfrs – less “failures”, more sales
Entire GSHP Industry benefits!
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Questions?
Stephen Hamstra
[email protected]
Thank you!
Greensleeves LLC 32 Shown another way…
BAS Contractor Greensleeves Sowware Engineer Energy Model 1. GHX Design Op<miza<on 2. Generates Control Algorithms 3. Sowware Download to BAS 4. Model-­‐Based Cx Process Downloads Predic<ve, Adap<ve, Self-­‐learning Controls On-­‐going Performance Repor<ng Sowware enhancements Sowware senses and adapts to “real” HVAC loads, and real GHX performance! Greensleeves LLC 33