WIND PUMPS
Traditional Concept + Modern Design
Product Description
How much water do the Poldaws produce?
The performance of the Poldaw Wind Pump depends on the pumping head (i.e. total lift required) and wind speeds.
The two most popular models are the 3.5m machine (the diameter of the rotor is 3.5 meters) and the 5m machine.
For a moderate pumping head of 20m, in a medium wind speed of 4m/s, outputs are:
The 3.5 meter machine can pump from depths of up to 110m, whilst the 5 meter machine can pump from 140m, now extended to 200m max by
means of a spring counterbalance system.
Are there sitting or wind condition constraints?
The Poldaw can start up under load in the lightest of breezes and operates in wind speeds as low as 3 meters per second (approx. 7 mph).
A simple test with an anemometer will confirm local wind speed conditions.
A range of tower heights is available, selected to suit local topography and wind conditions, for example a sheltered site may require a tall tower.
If there is doubt about the suitability of a site for a wind pump, Poldaw and/or its local licensees will advise.
Cost effectiveness of the Poldaw Wind Pump:
The Poldaw Wind Pump costs 30% less to manufacture than other similarly sized wind pumps and, being made with local materials and labor, have no import duties.
The initial purchase cost of a community water supply system using a Poldaw Wind Pump varies from country to country, but generally compares well with other powered pumping systems.
Running costs are negligible due to no fuel and minimal straightforward maintenance.
Easy maintenance:
Poldaw Wind Pumps have been designed to need very little maintenance. All that is required is the greasing of bearings once a year, with a general inspection of other components. The principal wearing parts of the whole system are the leather sealing washers in the pump piston,
which are replaced on average every 2 to 3 years.
Routine maintenance and pump washer replacement can easily be carried out with the tower standing. To simplify installation, and for any major
borehole or wind pump maintenance, the tower has been designed to hinge on two of its three feet so that the whole machine can be laid down by use of a winch.
Local mechanics can be trained in one to two days to carry out these procedures or the local manufacturer can provide support under an ongoing contract. The skill level required is much less than for diesel engine maintenance and attention is only needed once per year.
What happens when the wind doesn’t blow?
Wind pumps are suitable for any location with an average wind speed of 2.5 m/s or more and with no prolonged windless periods.
In such locations, on most days there is sufficient wind for the wind pump to operate for at least part of the day. However, to provide against windless
days, the Poldaw Wind Pump is usually installed with a water tank or reservoir. Generally a tank with three days of water supply is adequate.
What happens when there is a storm?
The Poldaw Wind Pump is designed, through the use of a hinged tail vane, to turn (or “furl”) automatically to minimize the area facing into
the wind. By means of this mechanism it will withstand storms of up to 180 kilometers per hour (= 50 m/s, 110 miles/hr.)
Product Description
How much water do the Poldaws produce?
The performance of the Poldaw Wind Pump depends on the pumping head (i.e. total lift required) and wind speeds.
The two most popular models are the 3.5m machine (the diameter of the rotor is 3.5 meters) and the 5m machine.
For a moderate pumping head of 20m, in a medium wind speed of 4m/s, outputs are:
- Poldaw 3.5 m: 21,000 liters per day
- Poldaw 5.0 m: 43,000 liters per day
The 3.5 meter machine can pump from depths of up to 110m, whilst the 5 meter machine can pump from 140m, now extended to 200m max by
means of a spring counterbalance system.
Are there sitting or wind condition constraints?
The Poldaw can start up under load in the lightest of breezes and operates in wind speeds as low as 3 meters per second (approx. 7 mph).
A simple test with an anemometer will confirm local wind speed conditions.
A range of tower heights is available, selected to suit local topography and wind conditions, for example a sheltered site may require a tall tower.
If there is doubt about the suitability of a site for a wind pump, Poldaw and/or its local licensees will advise.
Cost effectiveness of the Poldaw Wind Pump:
The Poldaw Wind Pump costs 30% less to manufacture than other similarly sized wind pumps and, being made with local materials and labor, have no import duties.
The initial purchase cost of a community water supply system using a Poldaw Wind Pump varies from country to country, but generally compares well with other powered pumping systems.
Running costs are negligible due to no fuel and minimal straightforward maintenance.
Easy maintenance:
Poldaw Wind Pumps have been designed to need very little maintenance. All that is required is the greasing of bearings once a year, with a general inspection of other components. The principal wearing parts of the whole system are the leather sealing washers in the pump piston,
which are replaced on average every 2 to 3 years.
Routine maintenance and pump washer replacement can easily be carried out with the tower standing. To simplify installation, and for any major
borehole or wind pump maintenance, the tower has been designed to hinge on two of its three feet so that the whole machine can be laid down by use of a winch.
Local mechanics can be trained in one to two days to carry out these procedures or the local manufacturer can provide support under an ongoing contract. The skill level required is much less than for diesel engine maintenance and attention is only needed once per year.
What happens when the wind doesn’t blow?
Wind pumps are suitable for any location with an average wind speed of 2.5 m/s or more and with no prolonged windless periods.
In such locations, on most days there is sufficient wind for the wind pump to operate for at least part of the day. However, to provide against windless
days, the Poldaw Wind Pump is usually installed with a water tank or reservoir. Generally a tank with three days of water supply is adequate.
What happens when there is a storm?
The Poldaw Wind Pump is designed, through the use of a hinged tail vane, to turn (or “furl”) automatically to minimize the area facing into
the wind. By means of this mechanism it will withstand storms of up to 180 kilometers per hour (= 50 m/s, 110 miles/hr.)
| 2.2 metre | 3.5 metre | 5 metre |
