DESIGN & CONSTRUCTION METHODS GEOTHERMAL STANDING COLUMN …€¦ · Column Well is: • Vertical...
Transcript of DESIGN & CONSTRUCTION METHODS GEOTHERMAL STANDING COLUMN …€¦ · Column Well is: • Vertical...
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Engineer Training Class3D-501-SCW Overview
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DESIGN & CONSTRUCTION METHODS GEOTHERMAL
STANDING COLUMN WELLSSTANDING COLUMN WELLS &
STATUE of LIBERTY ISLAND
STEVE GROSS, PE, CertainTeedValley Forge PA www.certainteed.com
CARL ORIO, CGD, AI, Water Energy Dist Inc
3D-501-1
CARL ORIO, CGD, AI, Water Energy Dist IncHampstead NH www.northeastgeo.com
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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DESIGN & CONSTRUCTION METHODS GEOTHERMAL
STANDING COLUMN WELLSSTANDING COLUMN WELLS &
STATUE of LIBERTY ISLAND
STEVE GROSS, PE, CertainTeedValley Forge PA www.certainteed.com
CARL ORIO, CGD, AI, Water Energy Dist Inc
3D-501-2
CARL ORIO, CGD, AI, Water Energy Dist IncHampstead NH www.northeastgeo.com
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Engineer Training Class3D-501-SCW Overview
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PVC Well Casing• Used as both Casing & Liner
– Domestic, Public Supply, Ag Irrigation, Geothermal, , pp y, g g , ,Environmental Monitoring
• Successfully used for over thirty years –believed to be the most commonly specified casing material in almost all parts of the U.S.
• Available from numerous qualified and reputable suppliers– Produced with a variety of strengths
(wall thicknesses) to suit a wide range of application conditions
– Typical sizes 2” – 16” O.D.
2
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Engineer Training Class3D-501-SCW Overview
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New - - - - - - - - -24” Certa-Lok Well
Casing
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PVC Well Casing
• Used as both Casing & Liner– Domestic, Public Supply, Ag Irrigation, Geothermal, EnvironmentalDomestic, Public Supply, Ag Irrigation, Geothermal, Environmental
Monitoring• Successfully used for over thirty years – believed to be the most
commonly specified casing material in almost all parts of the U.S.• Available from numerous qualified and reputable suppliers
– Produced with a variety of strengths (wall thicknesses) to suit a wide range of application conditionsT i l i 2” 16” O D– Typical sizes 2” – 16” O.D.
• Engineered continuous water-tight system that maintains integrity of the well, thus protecting natural resources– Corrosion-resistant material does not degrade with time– Leak-free joint
• PVC is generally a more affordable option, making it easier for g y p , ghomeowners that need a well to have one on their property
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Engineer Training Class3D-501-SCW Overview
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PVC Well Casing
Made to accepted national standards that control:standards that control:
• Material composition and properties– Tensile Strength, Elastic
Modulus, Impact Strength• Precise dimensions and
tolerances• Quality control and marking
requirements------------------------------------------NSF International tested,
d d li t d fapproved, and listed as safe for use with potable water ASTM F480
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Engineer Training Class3D-501-SCW Overview
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Construction Practices
NGWA Manual of Water Well Construction Practicesact ces
• Includes PVC, with solvent weld and spline lock joiningspline-lock joining systems
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Construction Practices (continued)
Well Screens & Intakes• Engineered screen should
be used with Casing– Maximizes open area for flow
performance– Protects against entrance of
fines during pumping
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Available with a Variety of Approved and Proven Joining Systems
Solvent Weld Belled End
Spline-Lok Mechanical Joining System
4
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Drop Pipe – PVC Options
Spline Lock Drop PipeDrop Pipe (2” – 8”)
Kwik-Set Threaded Drop Pipe (1” – 2”)
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Engineer Training Class3D-501-SCW Overview
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DESIGN & CONSTRUCTION METHODS GEOTHERMAL
STANDING COLUMN WELLSSTANDING COLUMN WELLS &
STATUE of LIBERTY ISLAND
STEVE GROSS, PE, CertainTeedValley Forge PA www.certainteed.com
CARL ORIO, CGD, AI, Water Energy Dist Inc
3D-501-11
CARL ORIO, CGD, AI, Water Energy Dist IncHampstead NH www.northeastgeo.com
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ShroudRetail Pavilion
501-12
P.A. Collins PE MEP & Acheson Doyle Partners Architects
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A STANDING COLUMN WELL
• BRIDGES THE GAP BETWEEN:– Closed Loop Earth Coupling
Open Well Earth Coupling
501-13
– Open Well Earth Coupling
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A Standing Column Well is:
• Vertical Re-circulating water filled bedrock bore hole
• Heat Exchange occurs when water is removed from one end of bore and returned to the other end.
• Periodic removal of small amounts of water from the well greatly enhances heat
501-14Courtesy of CertainTeed
transfer
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Engineer Training Class3D-501-SCW Overview
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NEAR-SURFACE BEDROCK in the U.S.
• Near-Surface Bedrock is Defined by Competent Rock within ~ 200 ft. of
Surface
• Approximately 62% of the Continental U.S. has Near-Surface Bedrock
501-15
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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GEOTHERMAL HEAT PUMPS
Higher Capacit
Standing Column Wells• Higher Capacity • Higher Efficiency • Lower First Cost
th
501-16
than a Closed Loop
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ShroudMiss LIBERTY Goes Miss LIBERTY Goes
GEOTHERMALGEOTHERMAL
501-17
ONE Standing Column ONE Standing Column Well for a Well for a 32 32 ton LOADton LOAD Courtesy Connecticut Wells, Inc
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LIBERTY ISLAND Pavalion Geothermal
TWO 20 Ton Roof topEmergency Bleed
Submersible Pump
TWO 20 Ton Roof topClimateMaster
Geothermal Heat Pumps
1 550 ft 8” main bore
Tail Pipe 6”&
4”Shroud
501-18
1,550 ft 8 main bore
40 tons connected RETAIL PAVILLIONnote – NO Intermediate Heat
Exchanger for Well Water
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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GEOTHERMAL HEAT PUMPSEarth Coupling
Standing Column Well
Geothermal Heat Pump
Emergency Bleed
Small ScaleSmall Scale
Geothermal Heat Pump
Typically 250-500 ft 3-8 tons/bore
Domestic Use Water
501-19
Submersible Pump
3 8 tons/bore
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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GEOTHERMAL HEAT PUMPSEarth Coupling
Standing Column WellEmergency Bleed
Submersible Pump
COMMERCIALCOMMERCIAL
Geothermal Heat Pumps
Typically 500 1 500 ft
Tail Pipe (Shroud)
501-20
Typically 500-1,500 ft 30-40 tons / bore (max.)
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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SCW has HIGHER CAPACITY than Closed Loop
45
50
55
60
65
Closed LoopStanding ColumnOpen-DiffusionBT
UH
25
30
35
40
45
MB
3D-501-21
203 Ton 4 Ton 5 Ton
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Engineer Training Class3D-501-SCW Overview
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SCW has HIGHER EFFICIENCY than Closed Loop
4
4.5
5
Closed LoopStanding Column
Open-Diffusion
P
3
3.5
4
CO
3D-501-22
33Ton 4Ton 5Ton
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Engineer Training Class3D-501-SCW Overview
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Comparative Cost of OPEN vs. CLOSED LOOP
3D-501-23
Rafferty -ASHRAE Journal March 2009
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CONSTRUCTION of SCWEFFECT of “EMERGENCY” BLEED
ADVECTIVE
Withdrawing Water
CONDUCTIVE
501-24
ADVECTIVE
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Heat Transfer within SCW
ConductiveConductiveConductiveConductiveENERGY MOVING THROUGH THE ROCK –MOLECULE TO MOLECULE, NO MOVEMENT
AdvectiveAdvectiveWATER AS AN ENERGY ENTITY MOVINGWATER AS AN ENERGY ENTITY MOVING
THOUGH ROCK FRACTURES, CHANGING ROCK TEMPERATURE
ConvectiveConvectiveENERGY MOVING AS WATER & MIXING .
OCCURS AT THE SURFACE OF & WITHIN
501-25
OCCURS AT THE SURFACE OF & WITHIN THE BORE
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Designing a STANDING COLUMN WELL
1. Heating & Cooling WRITTEN Loads by ASHRAE, Manual-J or N (Commercial)
2. Determine Month by Month Load Profiles3. Access Long Term Geologic Thermal Effects4. Issue Preliminary Bid/Drill Specifications5. Monitor Drilling
501-26
6. Report to State/Federal Agencies on Basis of Class V UIC Wells
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STANDING COLUMN WELL =SAME DESIGN MATHEMATICS
as
CLOSED LOOP EXCEPT
NO LOOP PLASTIC PIPE NO LOOP PLASTIC PIPE THERMAL RESISTANCE THERMAL RESISTANCE
&
501-27
HAS ADVECTIVE ENHANCEMENTHAS ADVECTIVE ENHANCEMENT
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STANDING COLUMN WELLSAME DESIGN MATHEMATICS
as CLOSED LOOPSAME INPUTS
T = Soil Temp - deg
Q’= Heat Transferred - btu/hr/Lft
r = Radial Dist from Line - ft
Ks = Thermal conductivity - btu/ft-deg
a = Thermal Diffusivity sqft/hr
ρ = Rock Density - lb/cuft
Cp = Rock Specific Heat = btu/lb-deg
t = Heat Pump Run time - hours
B = Integration Variable
501-28
a = Thermal Diffusivity - sqft/hr
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Engineer Training Class3D-501-SCW Overview
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STANDING COLUMN WELLSTypical NO BLEED RESULTS
Te
Conditionsρ= 200 lbs/ft3
r = bore - 6 “ diameter
Ks = 2.00 btuh/ft-degFmp
°F
mp-°F
Ks 2.00 btuh/ft degF
α = 0.05 sq. ft. / hour
cp = 0.20 Btu/lb-dg F
Tem
501-29
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STANDING COLUMN WELLS
10% BLEEDTypical 10% BLEED RESULTS
35
40
45
50 Conditionsρ= 200 lbs/ft3
r = bore - 6 “ diameter
Ks =6.00 btuh/ft-degFp°F
10
15
20
25
30
35
150'/ton
100'/ton
α = 0.05 sq. ft. / hour
cp = 0.20 Btu/lb-dg F
Tem
p
501-30
0 hrs 12 hrs 24 hrs 48 hrs 72 hrs 96 hrs
50'/ton
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Specification Bid/Drill
Consider a Drilling of Test Well?Consider a Drilling of Test Well?• The “First Well” is the “Test” Well
Drill it as if it were the first well, not a test well to be abandoned. Drilled as a water supply well.
F th t ll d t iFrom that well determine:
– Rock Characteristics– Well Yields & Locations
Ambient Static
501-31
– Ambient Static
– Draw Down Statics*
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Engineer Training Class3D-501-SCW Overview
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LIBERTY - Standing Column Well
D th 1 550 f t• Depth 1,550 feet• Over burden -17 feet• Water Zones -600 to 1,300 feet
S #/f 3• Bedrock Schist ~150 #/ft3
• Ambient Static - 12 feet
• Drawdown Static - 183 feet*
501-32
• Water Quality - Brackishu-Ni HX required
CuCu--Ni HX Ni HX RequiredRequired
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What it Takes• Capability of the Rig
– Pull Back •Bore Rod1 500 f tPull Back
– Air Compressor• Capability of Driller
– Deep Bore Experience
-1,500 feet•Handling of Water
-Temporary Run Off
501-33Liberty Island
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TYPICAL SCW Submersible Pump
Typ 8• Lightweight (PVC) plastic
tube to bottom of bore. (e.g. CertainTeed Certa-Lok TM)
• Allows pump, riser pipe and wires to be shortened Typ. 6
Typ. 8inch Case
wires to be shortened• Pump at top for ease of
service
Typ. 4inch
inch Bore
20’ 60’ fAn
501-34
inch Shroud
20’-60’ from bottom highly perforated
8 8 –– 6 6 –– 4 4 SCW
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Shroud• 8-6-4- Residential & Light Commercial
Typically up to 80 gpm pumping –typical 2-8 gpm bleed –
4” submersible pump
• 10-8-6 – CommercialTypically up to 130 gpm –
13-35 gpm bleed
501-35
6” Submersible Pump
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36
WELL INTERFACES
Overburden & Non-Competent Rock
SurfacePipe
Pitless adapters
Protecting Ground
Water from Mixing with
S f W t
Bed Rock Electric Ground
501-36
Surface Water
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CASING OPTIONS
STEEL – 8 inch casing 19#/ft minimum and 26#/ft desirable on large commercial
PVC –recommended if water has conductivity greater than 3,000-5,000+ µmho/cm (10% sea water)
501-37
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EXCESS WATER
• Typical On-Rig Compressor = 350 psig
• Water Lift = 808 feet• How to drill a 1 500 foot• How to drill a 1,500 foot
bore?808 ft
501-38
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Engineer Training Class3D-501-SCW Overview
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HANDLING EXCESS WATER
• Auxiliary Compressor >350 psig
• Temporary Dewatering• Temporary Dewatering
• Skill – Staying Ahead of inflow water
808 ft
501-39
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Engineer Training Class3D-501-SCW Overview
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FIRST WELL IS THE “TEST” WELL
• Logging• Draw Down Test at
Bleed Rate• Taking Rock Spoils• Taking Rock Spoils
Samples– Typical 3-4 ozs of
Spoils for Density Analysis
501-40
Analysis
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TYPES OF SHROUDS USEDThe CASING, SUPPORT & ADAPTERS
Bottom Set Hanging Supported
501-41
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Shroud Connections
GLUE &
SCREWSCREW
501-42
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Shroud, Riser & Drop Connections
SPLINE CONNECTION
501-43Certa Lok TM
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Shroud Connections
SPLINE CONNECTIONCl & Ali
501-44
Clean & Align
Certa Lok TM
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Shroud Connections
SPLINE
501-45CertainTeed Certa Lok TM
SPLINE CONNECTION
Inserting
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Shroud Connections
SPLINE CONNECTIONCerta Lok Riser
501-46
CONNECTION Connected
Certa-Lok TM
Certa-Lok Riser (Drop Pipe) Connection
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Engineer Training Class3D-501-SCW Overview
12/22/2010
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GLUE & SCREW SPLINE
Shroud, Riser & Drop Connections
• FREE of GLUE VOC NO YES
• DIS-ASSEMBLY NO YES
• ASSEMBLY SLOW FAST
• GLUE SENSITIVITY Temperature
501-47
GLUE SENSITIVITY Temperature
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Engineer Training Class3D-501-SCW Overview
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Shroud DIFFUSION
88--66--44 120 1 INCH HOLES OVER 40 FEET
1010--88--66 180 1 ¼ INCH HOLES OVER 60 FEET
20’ 60’ or
501-48
20’-60’ or 80’FROM BOTTOM
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Shroud
TYPICALTYPICAL 88--66--44
DIFFUSER (4” Shroud)
501-49
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Engineer Training Class3D-501-SCW Overview
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COMMERCIAL SUBMERSIBLE PUMP SELECTION
Pump Rate & Pump Head:• Total Dynamic Head (TDH)• Total Dynamic Head (TDH)
– Static Lift – at bleed rate*– Riser Pipe PD– Both Offset Pipes PD– Solids Trapper PD, If used
B ildi Ri if d– Building Riser, if used– Heat Pump HX PD– Misc. Trim PD– Drop Pipe PD– Suction Effect –PD
TYPICAL 3 10 H P
501-50
• TYPICAL 3 - 10 Hp Pump
Liberty Liberty -- 132 gpm@360 ft TDH = 20Hp132 gpm@360 ft TDH = 20Hp
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6” Shroud to 4”6 Shroud to 4 Shroud
an Unusual Requirement
Easily Met withEasily Met with the Spline
Connection Method
501-51
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LIBERTY STANDING COLUMN
BORE6”10”
260 feet4”
8”
D
1,130 feet1,550 feet
POR
TER
SH
RO
U
501-52
6”
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Variable Frequency Drive
• VFD Must Have:– Power Service RFI
FILTER – Well Pump Cable
REACTOR– REACTOR– Programmed for ≥30 Hz.– Over Pressure Inhibit– Electric Ground Plane
Connected to HP, Well Casing & Well Pump240/480 VOLT 240/480VOLT
501-53
Casing & Well Pump– Shielded Load Cable
240/480 VOLT 240/480VOLT1 or 3 PH 3PH
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IMPORTANCE of EARTH BOND
• EARTH BOND National Electric Code Section 1999• EARTH BOND - National Electric Code Section 1999– “shall be grounded…(when).located in a wet or damp location and not isolated” -section 250-
110(2)– ”….non-current-carrying metal parts of equipment and enclosures….shall be grounded
regardless of voltage.” - section 250-112(4)(a)– “The (grounding) connection shall be made by bonding the equipment grounding conductor to
the grounding electrode conductor” - section 250-130(a), (b)
Building Ground
G d W t
Heat Pumps Misapplied /Poor Bonding
501-54
City Water PipingGround WaterPlastic / Insulated Connections
Should NOT Become Building’s Primary Ground
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RETROFIT SCHOOLSix SCW Piping Typical Layout 3” HDPE Pipe
Return Pipes
Thermal Break
501-55
Thermal Break
Supply Pipes
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CONVECTIVE/ADVECTIVE BLEED SYSTEM
To & From Heat Pumps
M
To Roof Drain, Storm Drain,
NO Sewer or Septage
OBSERVED:
1.10% BLEED Effect Ks by 3 x -2 A Bl d Ti i f 15 60 i t
501-56
2, Average Bleed Time is for 15 - 60 minutes
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SUCTION EFECT on DROP PIPE
• Suction Drop BPD• Suction Drop can be as much as a complete vacuum, i.e. 34 feet Return Drop Pipe =
Bleed valve
feet• Insure return
to well line has adequate back pressure devices (BPD)
p pSuction Negative Head (vacuum)
501-57
devices (BPD) to permit use of bleed circuit
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REGULATORYCLASS V Underground Injection Control (UIC)
– Class V is a re-injection of “non-contact” drinking quality water to the earth via injection well(s)
– Re-injection of Heat Pump water is specifically allowed as a “non-contact cooling water” – type g yp5A7 under Federal & many State Regs.
– Varies from State to State – many States do not require any registration or permits for residential re-injection
– Usually requires registration for medium
501-58
Usually requires registration for medium installations & permit information for large commercial & SOME LARGE RESIDENTIAL FOR DOUBLETS
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Effects of Low Bleed Rate – 2 YearsRaymond Maine
2000 2002 Well Characteristics T t l 7 t2000 - 2002 Well Characteristics
80
100
120
leed
tim
e %
AIR
Total 7 tons, Low Production Well, 600ft SCW
First Year, 5%Bleed
0
20
40
60
Tem
p de
g. F
& b
l AIRWELLBLEED
when Required
Second Year,5% Bleed winter months when HP
501-59
0
1 18 35 52 69 86 103
120
137
154
171
188
205
222
239
Time in Weeks from 9/1/00
when HP is On
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Most Recent Standing Column Well Performance
note: After Ten Years MET is RetainedNe w England School Typical We ll Data
80
100
120Outs ide A ir Temperature
Well Return Temp
Well Supply Temp
0
20
40
60
11/9/2004 12/29/2004 2/17/2005 4/8/2005 5/28/2005 7/17/2005 9/5/2005 10/25/2005 12/14/2005
Tem
p D
eg F
Area Mean Earth Temp = 52-53 degF
501-60
-20
11/9/20040:00
12/29/20040:00
2/17/20050:00
4/8/20050:00
5/28/20050:00
7/17/20050:00
9/5/20050:00
10/25/20050:00
12/14/20050:00
Date
ASHRAE Transactions 006-06
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WHAT to EXPECT from a PROPER DESIGN
• Relatively Small Annual Change in Entering Water Temperature
• 30-40 heating tons per 1,500 foot Bore (5%-10% Bleed)
• Higher Heat Exchange with Higher Bleed Rates
501-61
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A PROPER DESIGN
ANDA
HAPPYCUSTOMER
501-62
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GEOTHERMAL HEAT PUMPSEarth Coupling
High Capacity
Standing Column Wells
g p yLower First Cost
Higher Efficiency
501-63