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.

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

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