E-rational 4000 series

BEP Europe - through its Energy & Infrastructure Division – “E-Rational”  is delivering a cost-effective solution to convert low temperature heat into clean energy power without emissions. Our state-of-the-art Organic Rankine Cycle (ORC) technology combined with the usage of industrial grade components makes E-Rational’s ORCs user-friendly, robust and economically viable.

E-Rational’s ORC machine has been designed for a maximized combined uptime and efficiency with a minimized operational and maintenance cost. This resulted in a containerized modular machine, CE-compliant, with plug-and-play connections for easy installation.

The ORC-4000 machine absorbs up to 4,000 kW (13.65 MMBTU/h) thermal heat in a temperature range between 80°C and 150°C (176 F – 302 F). The ORC units are heat powered by hot water, thermal oil or low pressure steam coming from:

  • Waste heat flows from industrial processes, e.g. cooling cycles from chemical plants, glass-, steel-, & food- industry, power plants, etc..
  • Unused heat in District Heating networks
  • Biomass furnaces and CHP/COGEN or biogas installations
  • Geothermal wells

Depending on the operating conditions, E-Rational’s ORC-4000 series are offered with different types of expander-generator sets with typical outputs ranging from 250 kWe to 500 kWe.

E-Rational 4000



Containerized modular Organic Rankine Cycle machine

Generator type

Asynchronous, 2 pole, 3 phase, 400V, 50-60 Hz

Generator Power Range

250kWe - 315kWe - 370kWe - 400kWe - 450kWe – 500 kWe


E-Rational (single screw, radial inflow)

Heat Exchangers

Plate heat exchangers

Applied EG-Norms:

- Machine directive

- EMC Directive

- Low voltage directive

- Pressure Equipment Directive



2004/108 EG



Electrical Enclosures


Control system

PLC, Web Based Remote Monitoring

Dimensions (L x W x H)

12,192mm x 2,438mm x 2,896 mm (40’ x 8’ x 9’6”)

Operating Mass (kg)

±26,000 kg (±57,300 Lbs)

Operating Conditions (ambient temperature)

-20°C to +50°C (-4 F to 122 F)

Temperature Heat input

80°C - 150°C (176 F – 302 F)

Maximum heat input

4,000 kWth (13.65 MMBTU/h)

Heat source

Hot water

Thermal oil

Low Pressure steam

ORC working Fluid

(depending on conditions)

Honeywell r245fa®

Solkatherm SES36®

Hydraulic connection heat source

2 Flanges DN300 PN16

Hydraulic connection cooling

2 Flanges DN300 PN16

Cooling system

Cold water

Cooling tower

Air cooler


Outdoor installation possible

Noise level

<75 dB at 10 m


No Emission

No fuel consumption


HEAT SOURCE: Hot water 3,500 kWth – 150 m³/h (11.9 MMBTU/h - 660 GPM)
COOLING: Cold water, direct condenser or air cooling

Temperature heat source Gross power production

Cold water out 20°C (68 F)

Cold water out 30°C (86 F)


194 F

266 kWe

228 kWe


212 F

298 kWe

259 kWe


230 F

326 kWe

291 kWe


248 F

403 kWe

364 kWe


266 F

434 kWe

396 kWe


284 F

450 kWe

450 kWe

HEAT SOURCE: Low Pressure Steam 3,500 kWth - 5.4 Tons/h - 1.75 kg/s (11.9 MMBTU/h - 11,905 Lbs/h)

COOLING: Cold water out 20°C (68°F)

Steam Pressure

Saturated Steam Temperature

Gross power production

1.5 bara

21.76 psi


232 F

346 kWe

2.0 bara

29.01 psi


248 F

378 kWe

2.8 bara

40.61 psi


268 F

413 kWe

4.0 bara

58.02 psi


289 F

450 kWe