Real-World Geothermal: Design, Control and Monitor-based Optimization ... · Real-World Geothermal: Design, Control and Monitor-based Optimization or ... Documents ’ Manually’

Greensleeves LLC

Real-World Geothermal: Design, Control and Monitor-based

Optimization or

“Let’s change the game…”

Stephen Hamstra, P.E. ASHRAE HBDP & Dis<nguished Lecturer

Fellow AEE, CGD, LEED-‐AP President

Greensleeves LLC [email protected]

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Greensleeves LLC

Outline/Agenda

•  Game Changer? Really?

•  Real-time v. Predictive Controls

•  Examples

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Greensleeves LLC

Why different do we need a different approach?

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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

Today’s disconnected approach

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Design

Create Construc/on Documents

Manually Program BAS

Commission System (?)

= Handoff or technology change

Walk away and hope it works as designed

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Energy Model GHX Design Control Spec’s

Programming BAS Cx BAS Sta<c, Reac<ve Sequences

Bidding and Award Process + SubmiVals

Shown another way… Engineer Engineer Engineer

BAS Contractor BAS Contractor BAS Contractor Re-‐Cx?

What if the “real” HVAC loads, weather, building schedule, GHX Performance, etc. don’t match design or just plain change???

Greensleeves LLC

Let’s Change the Game…

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Op/mize Design

Create Control

Intelligence

Model-‐based Cx

Load & Performance Analy/cs

Op/mize Control

Intelligence

= Digital Connec<on

Greensleeves LLC

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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Greensleeves LLC

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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Greensleeves LLC

INTEGRATE THE PROCESS

Confiden<al 9

Greensleeves LLC

Trane TRACE 700 File Support

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TRACE 700 can now create a “Greensleeves” file with hourly hea<ng/cooling loads plus Engineer’s hourly weather data (.TMY).

Greensleeves LLC


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

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Greensleeves LLC


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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

THE CONTROLS REVOLUTION

Confiden<al 13

Hybrids can take many forms

Heat Exchangers to Sewer or Irriga/on systems

Geo. Heat Pumps

CC Cooling Towers & Dry Coolers

Bodies of Water

CHP & Emergency Power Systems

Solar Thermal Systems

HEAT TRANSFER

Mass Tank/ Thermal BaQery

Geothermal Earth Heat Exchanger

HEAT TRANSFER

HEAT TRANSFER

HEAT TRANSFER

HEAT

TRANSFER

Weather condi<ons U<lity Rate Structure Forecasted Loads

Historical Performance Self-‐Adap<ng Self-‐Healing

Data Communica<on

Building Automa/on System

*: Indicates currently in Greensleeves simulator. Rest are in process.

*

*

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Greensleeves LLC

“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 17

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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%)

New

Con

struc<on

56°F

Greensleeves Avg EWT

ASHRAE Hybrid Avg EWT

70°F

Fullsize GeoThermal Avg EWT

65°F

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Full-‐sized GHX GS Hybrid


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%)

New

Con

struc<on

60°F




78°F

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50,400 BF 35,370 BF (-‐30%)

16,800 BF (-‐67%)


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%)

New

Con

struc<on

70°F



81°F


79°F

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ASHRAE Hybrid GS Hybrid


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%)

New

Con

struc<on


89°F


71°F

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New

Con

struc<on


GHX Borefeet 120,000 BF 72,800 BF 64,000 BF


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%)


77°F


75°F


61°F

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GHX Borefeet 18,450 BF 18,450 BF 18,450 BF


HVAC Op Cost $ 17,000 $ 17,000 (-‐0%) $ 15,000 (-‐12%)

1st Cost CCCT No CCCT $27,000 $22,000 (-‐18%)

Borefie

ld Rescue

69°F



85°F


90°F

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Borefie

ld Rescue

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Borefie

ld Rescue

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Borefie

ld Rescue

Greensleeves LLC

SUMMARY

Confiden<al 27

Greensleeves LLC

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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Greensleeves LLC

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

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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Greensleeves LLC

Questions?

Stephen Hamstra [email protected]

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Thank you!

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Shown another way…

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

BAS Contractor

Engineer

Greensleeves Sowware

Sowware senses and adapts to “real” HVAC loads, and real GHX performance!