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Home Moldova Technologies Low Speed Impeller Pump for Hydraulic Energy Conversion Systems

Low Speed Impeller Pump for Hydraulic Energy Conversion Systems

Description

The working elements of the water kinetic energy conversion systems develop very small speeds of rotation (1 – 5min-1). In the case of utilization of these systems for water pumping by high speed pumps (700 – 1500min-1) it is necessary to have a multiplication system with high multiplying ratio (i=140…1500). This fact leads to the increase of general costs and to the reduction of reliability.

A more advantageous solution consists in the utilization of low speed impeller pumps. This solution is the basis of elaboration of the micro hydropower station for water kinetic energy conversion into mechanical energy for water pumping. Aiming at the above, jointly with SA HIDROTEHNICA, Chisinau, we have elaborated the concept of low speed pump (n=300...500 min-1), have performed ample computer simulation of water wheels (fig. 1,a), and have designed the construction (fig. 1,b) of two typo-dimensions of impeller pumps (n=300 min-1; n=500min-1). Two industrial prototypes of the designed impeller pumps have been executed at HIDROTEHNICA enterprise (fig. 2,a,b) and laboratory experimental testing on the mentioned enterprise’s stand has been carried out.

As result of the carried out testing the following has been achieved:

  • mechanical efficiency – 0,7;
  • output factor - 30m3 (number of revolutions n=300 min-1 ) and 40m3 (n=500min-1),
  • respectively.

Low speed impeller pump are utilized in the microhydrostation structure.

Innovative Aspect and Main Advantages

The low speed impeller pumps were fabricated at the SA HIDROTEHNICA enterprise for the first time. Their utilisation in systems, in which the working element performs low speed revolutions, is reasonable as expenses for the multiplication system are reduced. Mechanical efficiency and output of the tested pumps are high.

Areas of Application

The impeller pumps which have been designed, fabri-cated and tested, can be utilized for water pumping in cases when the inlet revolution is relatively small (n=300…500min-1), such as micro hydropower stations for water kinetic energy conversion into mechanical energy for water pumping; wind systems for water pumping, etc.



Fig. 1. Computerized 3D model and design of the low speed impeller pump.


a)


b)

Fig. 2. Industrial prototypes of the impeller pumps: a) n=300 min-1, Q=30m3; b) n=500min-1, Q=40m3.

Stage of Development

Two typo-dimensions (30m3 and 40m3) of low speed impeller pumps (number of revolutions n=300 min-1 and n=500min-1, respectively), have been tested in laboratory conditions. It follows to be tested in real conditions on the pilot micro hydropower station for water kinetic energy conversion into mechanical energy (for water pumping), which will be mounted on the Prut River near Stoienesti village. The low speed impeller pumps with updated spe-cifications can be produced at the HIDROTEHNICA enterprise, Chisinau.

Contact Details

Technical University of Moldova,
Centre for the Elaboration of Renewable Energy Conversion Systems (CERECS)
Address: 168, Stefan cel Mare St. Chisinau, MD-2004, Republic of Moldova
Tel/Fax: (+373 22) 237 861, (+373 22) 445 088
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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