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PolyTrough 1800 Technical Specification v7 1
General Description
The PolyTrough 1800 is a roof and ground-mountable
parabolic trough collector developed for:
High performance up to 250°C outlet tempera-
ture
Ease of installation
Flexible configurations
Efficient shipping in ISO compliant containers
Low cost per kWh delivered
The solar heat is used in thermal applications such as:
Industrial processes (steam, water or oil)
Solar cooling systems
Organic Rankine Cycles (ORC) for power
generation
Desalination
Technical Data for the Base Module
Geometry
Refer to Drawing ‘Polytrough 1800_1250_2_2’
for a detailed drawing of the collector module.
Aperture area: 36.9 m2
Aperture width: 1.845 m
Length: 20.9 m
Height: 1.75 m
Focal length: 0.65 m
Rim angle: 71°
Concentration ratio: 54 (geometric)
Weight
Weight of complete module: 1,100 kg (30 kg/m2
aperture area)
NEP Solar Pty Ltd
21/14 Jubilee Ave I Warriewood I NSW 2102 I Australia
P: +61 2 9998 4700
F: +61 2 9999 2077
www.nep-solar.com
NEP Solar AG
Technoparkstrasse 1 I 8005 Zürich I Switzerland
P: +41 44 445 16 95
F: +41 43 411 90 08
www.nep-solar.com
Technical Data for the PolyTrough 1800
PolyTrough 1800 Technical Specification v7 2
Energy Performance
Nominal Thermal Performance
Thermal Efficiency: ~60% at 200°C mean collector
temperature and 1000 W/m2 DNI. Collector efficiency
curves for a range of DNI radiation are shown below.
Nominal Output: 22.2 kW per collector module or
0.60 kW per m2 in nominal conditions and 200°C
mean collector temperature.
Annual Yield
Annual yield depends on site and project characteris-
tics and will be modelled by NEP Solar upon client
request.
Performance Modelling
Annual thermal yield of an installed collector field is
calculated by NEP Solar on a project specific basis
with sophisticated and validated hourly simulation
models.
Certified performance measurement results and
Solar Keymark Certification (based on European
standard series EN 12975) are in preparation.
Technical Data for the PolyTrough 1800
Note: These diagrams are results of numerical simulations. They are not based on any experimental data.
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0 15 30 45 60 75
Radiation Incedence Angle on Collector Aperture
Incidence Angle Modifier (IAM)NEP Solar PolyTrough 1800
IAM incl.cos phi
cos phi
IAM w.o.cos phi
0%
10%
20%
30%
40%
50%
60%
70%
0 50 100 150 200 250
Delta T
Collector Efficiency CurvesNEP Solar PolyTrough 1800
1000
800
600
400
DNI [W/m2]
PolyTrough 1800 Technical Specification v7 3
Components of the Base Module
Reflector Segment (16 segments per module)
Length: 1250 mm
Width: 1845 mm (projected aperture)
Depth: 16 mm
Materials: Aluminium mirror with self supporting sand-
wich structure.
Mirror: Coated highly reflective and weather resistant
aluminium reflector.
Projected Mirror Area: 4.61 m2 per segment
(8 segments per module)
Reflectivity (DIN 5036-1 and -3):
Degree of total light reflection (Rho) >=93%
Degree of solar reflection (AM 1.5) >=89%
Torque Tube
Length: 5 m segments (4 torque tube segments per
collector).
Diameter: Large diameter manufactured tube. Carries
the bending and the torsional load efficiently.
Materials: Steel torque tube, with speciality anti-
corrosion coating.
Support Structure
Mounting Stands: Mounting stand assemblies support
the torque tube and contain bearings to allow torque
tube rotation.
Materials: Steel, hot dip galvanised.
Tracking System
Motor Drive: Brushless DC motor.
Motor Drive reduction: Direct coupled planetary gear-
box.
Reduction Gearbox: Direct drive slew gearbox.
Controller: Industry standard specialised solar tracking
module with network to Master Control System.
Tracking Logic: Algorithm based high precision track-
ing system. Independent tracking per collector module
with individual configuration. Any collector axis orienta-
tion is allowed.
Receiver
Absorber Tube: Diameter 34 mm by 1.5 mm wall
thickness by 2.5 m lengths; fully welded.
Pressure Rating: 96 bar at 200°C
Material: 1.4307 (EN1088) Stainless Steel tubing [AISI
304L] with mirror polished finish.
Selective Coating: Black chrome.
Cover: Diameter 56 mm borosilicate glass tube with
2.5 mm wall thickness by 2.5 m lengths with seals and
breather to eliminate condensation and dust.
Component Details
Technical Data for the PolyTrough 1800
PolyTrough 1800 Technical Specification v7 4
Additional Components per Basic Module
Measurement and Control Technology
Temperature Sensors: Industrial RTD temperature
sensor at outlet end of each module’s receiver tube.
Temperature sensors used during commissioning to
balance flow and during operation to protect against
stagnation and over-temperature.
Isolation and Safety Valves
Bleed valve on receiver tube to remove entrapped air.
Customer to supply ball type shut-off valve and globe
or DRV (depending on size and layout of field) valve
per module to isolate each module and balance the
flow through the rows during commissioning.
Additional Components in each Field
Master Control System
Proprietary collector field master controller for autono-
mous operation of the solar field according to tempera-
ture, flow and heat demand from the client system.
Interface with client control system through industry
standard protocols.
Technical Data for the PolyTrough 1800
NEP Solar AG
Technoparkstrasse 1 I 8005 Zürich I Switzerland
P: +41 44 445 16 95
F: +41 43 411 90 08
www.nep-solar.com
Additional Components