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 4.7.3.5 Summary
Auto-venting turbine technology is becoming an accepted means for economically improving
the environmental performance of new turbines (Fisher et al., 1998). The design methodology is
complex but becoming better understood as more installations are completed and tested. The
successful application of the technology depends on the specific characteristics of the turbine and water
passageways and may not be suited for all installations. Summary information is available in Table
4.7.2.
Table 4.7.2
Summary of Auto-Venting Turbine Technology
Characteristic
Description
Targets
Low DO levels of the release waters commonly
associated with hydropower generation during strati-
fied periods and anoxic conditions.
Mode of action
Aspiration of air into turbine water flow through
passages specifically designed for aeration and
implemented during turbine replacement to increase
the DO levels of the release waters.
Effectiveness
Up to 50 percent of the DO deficit may be satisfied by
this technique.
Longevity
Based on the life of the turbine; years.
Negative features
Is not applicable to all projects. Significant costs and
time involved in analysis and design of aeration
alternatives. Slight reduction in the generating
efficiency during aeration and, consequently, the
related revenues. Possible nitrogen supersaturation.
Costs
Low to Moderate depending on the complexity of the
aeration alternatives.
Applicability to reservoirs
Applicable to hydropower projects that are being
upgraded..
4.7-8
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