Screw Hydro Power Turbines

Clean Power

Water flows down by gravity through the screw turbine and this initiates its rotation. This rotation is transmitted to the gearbox and subsequently to generator with increased rpm to produce electricity. The inlet channel has a manual coarse screen to hold back bigger foreign floating materials coming with water and an emergency gate for the isolation of flow during maintenance.

Hydropower Screw

Operating Principle:

The water flows down through the screw and this initiates its rotation. This rotation is transmitted to the gear box and subsequently to generator with increased rpm to produce electricity. The inlet channel has a manual coarse screen to hold back bigger foreign floating materials coming with the water and an emergency gate for isolation of flow during maintenance.

• Overflow weirs/ check dams on rivers.

• River/streams flowing down inclines

• Steps/falls provided in canals to match contours

• Treated water outlets of Sewage/effluent plants

• Industrial Process water outlet from Power, Steel & Paper plants

• Replacements of water wheels & other type of turbines

Power calculation general thumb rule:

P=Q X g X H X η H= Head in Meters H= Head in Meters

η= Overall Efficiency, aprx .

g= gravity, 9.81 m/s

Advantage of Hydropower Screw

Ideal solution for low head application

Hydropower Screw offers high efficiency generation potential with minimal civil interface for low water head installation.

Efficient despite variable water heights

The Hydropower Screw is able to cope with varying water flow (as low as 10% partial load) and heads and still generates electricity.

Eco Friendly

The Hydropower Screw allows smaller sediments to pass through and so natural sediment structure of river bed is maintained. It is also improves oxygenation and therefore the quality of water which helps in growth of fish & fauna.

Fish friendly

Unlike the traditional turbines, the Archimedean screw is a non pressurized operating system which operates at low revolution speed. This allows most of the fishes to travel downstream through the screw without causing any harm to them. Upstream travel of fishes can be ascertained by provision ofseparate fish ladders.

Quiet operation
The noise specific Rehart screw design & workmanship ensures smooth running & quiet operations. As a result fast project installation/ commissioning with lesser inconvenience to nearby community/ residents becomes possible.

Fast installation
Whether as a compact unit, semi-compact or steel though type, every Hydropower Screw system is delivered ready made. This enables installations within days of receipt of equipment.

Negligible operational cost
The sophisticated yet simple to use design needs no operating personnel. Monitoring is carried out via computers and monitoring data could be availed via text messages & emails. This result into negligible cost of its operation.

Low maintenance
Rigid design, low rotational speed and patented bearing system, ensures low product maintenance and breakdowns.

High reliability
All parts are manufactured to high quality standards. This ensures reliable generation of electricity and long life of equipment.

Types of Models/ Series

SERIES CR : Compact type: System completely factory assembled. All Components have been integrated. The Trough is designed as Tube. Suitable for low and medium volumes. Output unit under weather protection cover housing not required.

SERIES CR : Totally enclosed compact type: System completely factory assembled. All Components have been integrated. Only a strip footing at the outlet and a channel for the inlet is required on site.

SERIES SH: Steel trough for casting: The trough is fastened at the precast structure and then with concrete. Practical mechanical engineering, high expenditure for hydraulic engineering.

SERIES SH: Steel trough for casting: The trough is self supporting and doesn’t need casting. The output unit is located on a foundation of a building.

Assembly

Assembly of Hydropower screw series CS

Structure: Foundation at the bottom inlet channel and the top

Everything is factory assembled. Therefore the systems is lifted into position and fixed on site.

Assembly of Hydropower screw series SH

According to planning specification this structure is to be built before the system is delivered.

Fixation of the trough. Bolting of upper bearing and gearbox console.

The Casting of screw trough and gearbox console with concrete is a mandatory work step.

Final assembly fix deflector shields, align the screw, finalize electrical works, complete power house.