Kijito 2008 Windpump
Bobs Harries Engineering Ltd with CWD Netherlands
A wind-powered groundwater pump.
The Kijito 2008 is a model within the Kijito 2000 series of small wind pumps manufactured by Bob Harries Engineering Ltd (BHEL). Kijito wind pumps are prevalent in the East Africa region and come in a range 8 – 26 ft (2.44 – 7.93 m) of rotor diameters. The Kijito 2000 series is intended to be suitable for small holder farmers, with water sources of about 20 m below ground and who need a limited amount of water for livestock and domestic needs.
This product is currently distributed in East Africa, primarily Kenya and Tanzania, with very limited global distribution.
This product has been implemented by Bob Harries Engineering Ltd (BHEL).
2,790 USD converted May 2020 for the Kijito 2008 including tower.
Goal 6: Clean water and sanitation
This product targets small holder farmers, with water sources of approximately 20 m below ground and who need domestic water, agricultural and livestock needs.
This product is produced in Thika, Kenya by BHEL.
BHEL have staff of 20 skilled personnel, who manufacture the entire range of windpumps and pump cylinders. Apart from the imported ball bearings, the entire Kijito Windpump range is manufactured using local components at the BHEL workshop.
The product can be ordered directly by contacting BHEL.
Description of the pump type
Power required, measured in watts
Manufacturer-specified discharge rate, measured at a specific head
Maximum depth of water the pump can pull
Piston nominal diameter, measured in centimeters
The Kijito 2008 windpump transmits power from the eccentrically placed rotor to the pump through a rocker to the pumprods. All rotating components run on ball and roller bearings, which require lubrication twice a year using a vehicle grease gun. The Kijito 2008 model specifications follow:
- Rotor Diameter: 8 ft (2.4 m) with 12 blades. The models range between 8 – 26 ft (2.44 – 7.93 m) of rotor diameters.
- Tower: Steel tubular mast with steel rod guides hinged at the tower base. Kijitos are normally supplied on 30 ft (9 m) tripod towers. However extension sections are available as options to increase the rotor height and get better performance. All towers are hinged at their bases to allow easy erection and servicing. This also greatly facilitates access to the borehole when the wind pump is lowered, and reduces borehole and pump maintenance time and costs.
- Tail: Hinged side vane attached to the transmission via a steel boom providing automatic over speed control by means of yawing activated by the eccentrically placed rotor and hinged vane.
- Furling: Done by hand with a stop rod on the transmission.
- Weight: Rotor 50 lbs (22.7 kgs), Transmission 104 lbs (47 kgs), Tower 198 lbs (90 kgs).
The system can be installed by the customer, using instructions provided, and is transportable in most 1 tonne pick-ups. Alternatively, a foreman can be provided by BHEL to oversee the installation assuming housing is provided.
The rotor blades can be individually replaced, if damaged for any reason.
The product can function for ~20 years, with proper operations and maintenance, which can be challenging.
The pumping yield depend on wind conditions. The manufacturer specifies a 20 ft (6 m) rotor can provide 78.47 L/min at 20 m fat 4-6 m/s wind speed.
Performance testing has been conducted by the Intermediate Technology Development Group –
ITDG (now Practical Action) determining wind pump performance.
No hazards listed by designer.
The product can include a 10 ft (3 m) tower extension.
Harries, M., 2002, Disseminating wind pumps in rural Kenya – Meeting rural water needs using locally manufactured wind pumps, Energy Policy, 30, pp. 1087-1094.
Kenna, J.P., Burton, J.D., Pinilla, A.E., 1987, Performance Monitoring of Windpumps in Kenya, Wind Engineering, 11, pp. 141-152.
Ogana, W., 1987, Wind Energy Development in Kenya – A Review, Solar & Wind Technology, 4, pp. 291-202.
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