monitoring results and operational experiences for a ... · monitoring results and operational...
Post on 08-Oct-2018
221 Views
Preview:
TRANSCRIPT
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar districtheating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
J. Nussbicker
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
Outline
Introduction
Borehole Thermal Energy Store (BTES)
District heating system
Simulation results
Summary
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
Heating plant
1. Phase of construction2. Phase of constructionComplete construction area
BTES
Solar collectors
Introduction
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-Introduction-
Heating plantwith auxiliary burner
Solar collectors5263 m²
Borehole thermal energy store63360 m3
Two buffer tanks each 100 m3
Heat distribution net
300 accomodation units & public buildings
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Borehole Thermal Energy Store
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
M17
1. extension
2. extension
experimental store
M18
M14
M01
M02 M03
M16
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
M17
1. extension
2. extension
experimental store
M18
M14
M01
M02 M03
M161997: experimental store 1998: 1st extension2001: 2nd extension
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
Borehole wall
Grouting material( entonite-
sand-cement)Suspension of b
25 mm
115 / 150 mmPolybutene-Double-U-pipe25 x 2.3 mm
Insulation(200 mm)
Top of ground
Cov
erin
g la
yer
(app
r. 2
- 3 m
)Th
erm
al a
ctiv
e de
pth
(30
m)
Borehole-grouting
Borehole
Double-U-Pipe
Connection pipe insand layer
Scheme of a borehole heat exchanger
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
0.030
0.035
0.040
0.045
0.050
0.055
0.060
0.065
0.070
0 5 10 15 20 25 30 35 40 45 50 55
temperature ϑ [°C]
ther
mal
con
duct
ivity
[W/m
⋅K]
Styrodur moist with foil
Styrodur dry with foil
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
Insulation of the BTES
Measurements by M. Benner, ITW
soil (2-3 m)sealing (foil)drainagefoil, diffusibleinsulation (0.2 m)drainage
sealing layersand
soil
boreholeu-pipe
liner, non-vapor retarder
liner
liner
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
-150
-100
-50
0
50
100
150
200
250
300
350
Jan99
Jul99
Jan00
Jul00
Jan01
Jul01
Jan02
Jul02
Jan03
Jul03
Jan04
Jul04
Jan05
Jul05
heat
in M
Wh
per m
onth
-30
-20
-10
0
10
20
30
40
50
60
70Jan 99 Jul 99 Jan 00 Jul 00 Jan 01 Jul 01 Jan 02 Jul 02 Jan 03 Jul 03 Jan 04 Jul 04 Jan 05 Jul 05
tem
pera
ture
in °C
temperature first extension in 10 m depthtemperature second extension in 10 m depth
construction work for 2nd extension
charging
discharging
Charging & discharging heat amouts and temperatures in the BTES
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
District heating system
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-District heating system-
Heating plant
1. Phase of construction2. Phase of constructionComplete construction area
BTES
Solar collectors
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-District heating system-
0
10
20
30
40
50
60
70
80
90
Jan-02
Apr-02
Jul-02
Oct-02
Jan-03
Apr-03
Jul-03
Oct-03
Jan-04
Apr-04
Jul-04
Oct-04
Jan-05
Apr-05
Jul-05
Oct-05
tem
pera
ture
in °C
0
10
20
30
40
50
60
70
80
90
volu
me
flow
in m
³/h
net supply temperaturenet return temperaturenet volume flow
supply of adjacent district heating net
connection and supplyof new buildings
supply of adjacent district heating net
connection and supplyof new buildings
Temperatures and volume flows in the heat distribution net
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-District heating system-
Q Gasboiler 3311 MWh/a
Q Heat losses 1032,5 MWh/a
(heat distribution net, calc.)
Q Buildings 3534,5 MWh/a
Q Heat losses 258 MWh/a
(solar net, calc.)
QSolar,direct 934,5 MWh/a
Q Store,discharge 321,5 MWh/a
QStorage 155,5 MWh/a
Heat balance for the district heating system (2005)
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
Simulations
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-Simulations-
Superposition Borehole Model (for TRNSYS)
528 Borehole Heat Exchangers (BHE)
non-uniformly placement of BHE‘s
hydraulic coupling of BHE‘s (seriell, parallel)
ground layers
implementation in TRNSYS for system simulations
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-Simulations-
0
10
20
30
40
50
60
70
80
01.12.97 01.12.98 01.12.99 01.12.00 01.12.01 01.12.02 01.12.03 01.12.04
tem
pera
ture
in °C
M17 (10 m)
M17 (32 m)
calc.meas.
calc.meas.thermal conductivity 1997-1998: 2.0 W/(m⋅K) 1997-2002: 2.2 W/(m⋅K) 2003-2005: 2.4 W/(m⋅K)volumetric heat capacity 2.85 MJ/(m³⋅K)
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
Summary & conclusions
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-Summary & conclusion-
Solar fraction
2002-2005: 30-40% (measured)
design: 50%
Future: increasing heat demand?
installation of a heat pump?
further extension of the BTES?
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
more information:www.itw.uni-stuttgart.de/sunwww.solarthermie2000plus.de
Thank you for your attention!
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
Construction of the BTES
experimental store & 1st extension 2nd extension
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
Construction of the BTES
experimental store 2nd extension
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
-40
-35
-30
-25
-20
-15
-10
-5
025 30 35 40 45 50 55 60 65
temperature in °C
dept
h in
m
Aug. 04 Sep. 04 Oct. 04 Nov. 04 Dec. 04 Jan. 05
Feb. 05 March 05 April 05 May 05 June 05 July 05
BTES
Temperatures in the BTES
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
Connection ducts
experimental store & 1st extension 2nd extension (pipes before insulation)
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-BTES-
10
20
30
40
50
60
70
Jan 99 Jul 99 Jan 00 Jul 00 Jan 01 Jul 01 Jan 02 Jul 02 Jan 03 Jul 03 Jan 04 Jul 04 Jan 05
tem
pera
ture
in °C
1. extension (0 m)
1. extension (20 m)2. extension (0 m)
2. extension (20 m)
1. extension (32 m) 2. extension (32 m)
Temperatures in the BTES
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-District heating system-
Solar gross heat gain of the solar collectors (5263 m³)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
School seniorresidence
shoppingcentre
terracedhouses
carport wall senior careresidence
Eglob,coll
sola
r gro
ss h
eat g
ain
in k
Wh/
(m²·a
)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
sola
r irr
adia
tion
(col
lect
or p
lane
, 15
°) in
kW
h/(m
²·a)
1999 2000
2001 2002
2003 2004
2005
University of StuttgartInstitute for Thermodynamics and Thermal EngineeringSolar Assisted District HeatingJanet Nussbicker
Solarthermie2000plus
Monitoring results and operational experiences for a central solar district heating system with Borehole Thermal Energy Store in Neckarsulm (Germany)
-Simulations-
0
10
20
30
40
50
60
70
01.12.97 01.12.98 01.12.99 01.12.00 01.12.01 01.12.02 01.12.03 01.12.04
tem
pera
ture
in °C
M14 (5 m)
M14 (10 m)
M14 (32 m)
calc.meas.
calc.meas.
calc.meas.
thermal conductivity 1997-1998: 2.0 W/(m⋅K) 1997-2002: 2.2 W/(m⋅K) 2003-2005: 2.4 W/(m⋅K)volumetric heat capacity 2.85 MJ/(m³⋅K)
top related