geo exchange systems (ground coupled hydronic heat pump hvac - - PowerPoint PPT Presentation

▶
geo exchange
SMART_READER_LITE
LIVE PREVIEW

geo exchange systems (ground coupled hydronic heat pump hvac - - PowerPoint PPT Presentation

Dec 31, 2022 175 likes •578 views

USGBC - Cascadia Chapter | 14 September 2005 geo exchange systems (ground coupled hydronic heat pump hvac systems) BLRB Architects , p.s. what is geoexchange? A water source heat pump system, designed to exchange heat energy with the earth.

slide-1
SLIDE 1

geoexchange

(ground coupled hydronic heat pump hvac systems)

systems

BLRB Architects, p.s.

USGBC - Cascadia Chapter | 14 September 2005

slide-2
SLIDE 2

G e o E x c h a n g e S y s t e m s

what is geoexchange?

  • A water source heat pump system, designed to exchange

heat energy with the earth.

  • A Geoexchange System has 4 components:
  • A Ground Loop Heat Exchange Piping - In Ground
  • Fluid Pumping System and Headers - In Central Mechanical Room
  • A Geoexchange Heat Pump(s) - In Mechanical Space
  • Conditioned Air Distribution System - Above or Below

Space Served

  • It can simultaneously provide:
  • Heating
  • Cooling
  • Hot Water
slide-3
SLIDE 3

G e o E x c h a n g e S y s t e m s

what are the benefi ts?

  • Reduced Energy Costs → 20 to 60%
  • Reduced Maintenance Costs → 30 to 50%
  • Reduced Water Consumption → ± 20%
  • No Exposed Outdoor Equipment
  • Simultaneous Heating and Cooling
  • Improved Comfort → Individual Room Control
  • Quieter Operation (Mech. Attic Use, No Cooling Tower)
slide-4
SLIDE 4

G e o E x c h a n g e S y s t e m s

geoexchange benefi ts

  • Reduced Air Quality and Fire Safety Issues
  • Smaller Mechanical Room
  • Reduced Ductwork/Decentralized Design
  • Makes Hot Water
  • Utility Peak Power Reduction
  • Lowest life Cycle Costs (LCC)
slide-5
SLIDE 5

G e o E x c h a n g e S y s t e m s

Heat Pump Systems

CLOSE HEADERS 15' TO 20' HIGH DENSITY POLYETHYLENE PIPE (3/4" TO 1-1/2" DIAMETER) U-BENDS

vertical ground-coupled

slide-6
SLIDE 6

G e o E x c h a n g e S y s t e m s

Heat Pump Systems

conventional horizontal ground-coupled

5' Min. BACKHOE EXCAVATION 3/4" TO 1-1/2" HIGH DENSITY POLYETHYLENE PIPE 6' 4' TRENCHER INSTALLATION REVERSE-RETURN HEADERS
slide-7
SLIDE 7

G e o E x c h a n g e S y s t e m s

Heat Pump Systems

slinky coil ground-coupled

BACKHOE INSTALLATION TRENCHER INSTALLATION 5' MIN 5' MIN 3/4" HIGH DENSITY POLYETHYLENE PIPE COILS OR POLYBUTYLENE
slide-8
SLIDE 8

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

geoexchange project example Kapowsin Elementary School

Opening:

Fall 2003

Owner:

Bethel School District

10412 264th Street East | Graham, Washington

slide-9
SLIDE 9

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

BLRB geoexchange project example

1st Place Winner of the CEFPI WA Chapter Competition

“Why We Love Our School”

slide-10
SLIDE 10

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

site plan

slide-11
SLIDE 11

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

site with geoexchange

slide-12
SLIDE 12

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

geoexchange concepts at Kapowsin

  • Trench System Using Slinky Pipe Under Playfields
  • Trench Area is About 215% of Floor Area
  • GeoExchange System Provides Domestic Water Preheat
  • Trenches Used to Enhance Surface Drainage at Playfield
  • Additional Cost - Minimal or None at All

(Puget Sound Energy Grant of $35,000 Received)

slide-13
SLIDE 13

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

partial mechanical site plan

slide-14
SLIDE 14

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

slinky ground heat exchanger

slide-15
SLIDE 15

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

ground heat exchanger piping trench

slide-16
SLIDE 16

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

supply & return header mains

slide-17
SLIDE 17

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

heat pump piping system

slide-18
SLIDE 18

G e o E x c h a n g e S y s t e m s

Kapowsin Elementary School

hot water tank preheat (∆ ± 10°F)

slide-19
SLIDE 19

G e o E x c h a n g e S y s t e m s

2300 105th Street | Tacoma, Washington

Midland Elementary School

geoexchange project example Midland Elementary School

Opening:

Fall 2003

Owner:

Franklin Pierce School District

slide-20
SLIDE 20

G e o E x c h a n g e S y s t e m s

Midland Elementary School

geoexchange project example

slide-21
SLIDE 21

G e o E x c h a n g e S y s t e m s

Midland Elementary School

site plan

slide-22
SLIDE 22

G e o E x c h a n g e S y s t e m s

Midland Elementary School

site with geoexchange

slide-23
SLIDE 23

G e o E x c h a n g e S y s t e m s

Midland Elementary School

geoexchange concepts at Midland

  • Trench System Using Slinky Pipe Under Playfields and

Bus Loop

  • Trench Area is About 195% of Floor Area
  • Space Limitations Require Use of Supplemental Boiler,

but No Cooling Tower Required

  • Additional Cost of ± $100,000 Funded by School District
slide-24
SLIDE 24

G e o E x c h a n g e S y s t e m s

geoexchange project example William Wiley Elementary School

Opening:

Fall 1999

Owner:

Richland School District

2820 South Highlands Blvd. | West Richland, Washington

William Wiley Elementary School

slide-25
SLIDE 25

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

site plan

slide-26
SLIDE 26

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

site with geoexchange

slide-27
SLIDE 27

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

geoexchange concepts used at Wiley

  • 144 Wells, 225 Feet Deep
  • Located Under Playfield
  • Spaced 15 Feet Apart
  • Well Area is About 44% of Floor Area
  • Each Well has 3/4 Inch Polyethylene Supply and Return Pipes

Connected to a 2 Inch Header

  • Fluid is Water with 15% Methanol Solution and Other Typical

Treatment Chemicals

  • Additional Cost of ± $190,000 Funded by a No Interest Loan

from Benton Rural Electric

slide-28
SLIDE 28

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

mechanical room

  • Supply Header (Wells to Building)
  • Return Header (Building to Wells)
  • Water Treatment System
  • Variable Speed Pumps (2)
  • Electric Water Heaters (2)

→ Independent of GeoExchange System

(No Boiler, Cooling Tower or Heat Exchanger/Fluid Cooler)

Mechanical Room Floor Plan

slide-29
SLIDE 29

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

mechanical lofts above corridors & toilet rooms

  • Supply Air
  • Return Air
  • Extended Range Hydronic

Heat Pumps with Filters

  • Relief Air at Soffits
  • Fresh Air Supplied by (3) Large

Soffit Grilles with Filters and Electric Preheat Coils (Not in Picture)

Mechanical Loft

slide-30
SLIDE 30

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

in rooms

  • Occupancy Sensors that Turn Off Lights and Fresh Air

when No Occupancy

  • CO2 Sensors to Control Fresh Air in Large Spaces
  • Zoned Light Switching Coordinated with Daylighting
  • Daylighting Sensitive Dimming in Library
  • Electronic Control at Toilet Room Fixtures
slide-31
SLIDE 31

G e o E x c h a n g e S y s t e m s

William Wiley Elementary School

  • ther concepts
  • Building Orientation
  • Use of Daylight
  • 75% of Spaces are Daylighted
  • Building Envelope Insulation and Compactness
  • Natural Ventilation via Operable Windows
  • Electrical System Load Shedding
slide-32
SLIDE 32

G e o E x c h a n g e S y s t e m s

Beaver Lake Middle School

geoexchange project example Beaver Lake Middle School

Opening:

Fall 1994

Owner:

Issaquah School District

25025 SE 32nd Street | Issaquah, Washington

slide-33
SLIDE 33

G e o E x c h a n g e S y s t e m s

Beaver Lake Middle School

geoexchange concepts at Beaver Lake

  • Trench System with Straight Pipe
  • Pipes Located Under Playfields and Some Parking Areas
  • Trench is About 240% of Floor Area
  • Additional Cost of ± $300,000 Funded by a Puget Power

Grant

slide-34
SLIDE 34

G e o E x c h a n g e S y s t e m s

Beaver Lake Middle School

site plan

slide-35
SLIDE 35

G e o E x c h a n g e S y s t e m s

Beaver Lake Middle School

site with geoexchange

slide-36
SLIDE 36

G e o E x c h a n g e S y s t e m s

  • ther considerations
  • Building and Site Environment Requirements
  • Is Heating and Cooling Required?
  • Is Antifreeze Recommended?
  • Maintenance and Operation
  • On-Staff Expertise
  • Site Area
  • Wells or Trenches Take Space
  • Subsurface Conditions
  • Are the Soils Conductive?
  • Use of Conductive Grout
  • Are Soils Constructible?
  • Coordination with Utilities
  • Potential for Conflicts or Enhancements Requires Special Mechanical, Civil and

Landscape Coordination

  • Grants Available?
slide-37
SLIDE 37

G e o E x c h a n g e S y s t e m s

lessons learned

  • Commission the System with an Agent who Understands the System
  • Train Maintenance & Operations Staff
  • Monitor Energy Use and Report to A/E and Commissioning Agent
  • Ongoing Training of New Staff
  • Understand that Individual Adjustments may Affect Entire System - Usually

for the Worst

  • Flow
  • Deadband
  • Need for Recommissioning
  • Recommission System if Necessary
slide-38
SLIDE 38

G e o E x c h a n g e S y s t e m s

design team for projects discussed

Architect BLRB Architects Mechanical/Electrical Tres West Engineers Structural Putnam Collins Scott Associates Civil AHBL, Inc. (Kapowsin Elementary School) Sitts & Hill Engineers

(Midland Elementary School and Beaver Lake Middle School)

J.U.B. Engineers (Wiley Elementary School) Landscape Lynn William Horn & Associates

slide-39
SLIDE 39

G e o E x c h a n g e S y s t e m s

resources GHPC

Geothermal Heat Pump Consortium (202) 558-7175 www.geoexchange.org

AEEES

Association for Efficient Environmental Energy Systems (530) 750-0135 info@aeees.org