Gas Turbine Evaporative Cooling Media Replacement Scheduling
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Solution Overview
Problem
Conventional evaporative cooling systems in gas turbine engines face inefficiencies due to media degradation, leading to reduced performance and increased costs for frequent replacements, with water shedding causing damage and requiring balancing of replacement costs with potential efficiency losses.
Innovation Solution
A method and system for evaluating media effectiveness using sensors and a controller to determine a media effectiveness model, calculating the loss in evaporative benefit cost over time, and scheduling optimal media replacement based on when this cost exceeds replacement costs, utilizing a synthetic media pad and monitoring system to optimize media use and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If media replacement is performed frequently to maintain efficiency, then gas turbine efficiency is maintained, but replacement costs and downtime increase
Solution Approach 1:
The system continuously monitors media effectiveness through sensors that detect parameters such as pressure drop, flow rate, and temperature differential across the media pad. This feedback enables real-time assessment of media degradation and triggers replacement only when performance thresholds are breached, optimizing the balance between maintaining efficiency and minimizing replacement frequency.
Solution Approach 2:
The system performs preliminary assessment of media condition by comparing current performance parameters against baseline values and degradation trends. This allows prediction of future media failure points and enables scheduled replacement before actual failure occurs, reducing unexpected downtime while avoiding premature replacement.
2Loss of substance
If media replacement is delayed to reduce costs, then replacement costs decrease, but evaporative cooling effectiveness deteriorates
Solution Approach 1:
The system monitors cooling effectiveness through temperature sensors and flow measurements, providing continuous feedback on evaporative performance. This enables objective determination of when media degradation impacts cooling effectiveness, allowing replacement to be timed precisely when performance thresholds are breached rather than using fixed intervals.
Solution Approach 2:
The system tracks changes in key parameters such as pressure drop across the media pad, airflow rate, and temperature differential to quantify media degradation. By monitoring these parameter trends, the system can determine the optimal replacement timing that balances cost savings from extended media life with maintaining adequate cooling effectiveness.
3Ease of operation
If fixed replacement intervals are used, then replacement scheduling is simple, but media degradation variability cannot be accounted for
Solution Approach 1:
The system replaces fixed-interval replacement with condition-based replacement through continuous monitoring of media performance parameters. Sensors provide feedback on actual media degradation state, enabling dynamic adjustment of replacement timing based on real-time conditions rather than predetermined schedules.
Solution Approach 2:
The system establishes baseline performance parameters during media installation and continuously compares current measurements against these baselines. This preliminary reference framework enables objective assessment of degradation trends and triggers replacement only when performance thresholds are breached, replacing arbitrary time intervals with data-driven decision-making.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach optimizes media replacement timing, reducing downtime and costs while maintaining gas turbine efficiency by accurately assessing media degradation and scheduling replacements when the loss in evaporative benefit exceeds replacement costs, thereby extending media lifespan and improving overall engine performance.
Implementation Method 1
The airflow passages through such wetted media pads are intended to provide effective water evaporation and mixing of the flow of ambient air with the water vapor from the flow of water
Implementation Method 2
inlet air systems with one or more heat exchangers may be used to cool the ambient air flow through latent cooling or through sensible cooling
Implementation Method 3
The ambient air flow interacts with the coolant flow in the wetted media pad for heat exchange therewith
Data Source
AI summary
The present application provides a method of evaluating media effectiveness in a gas turbine engine. The method may include the steps of receiving a baseline media effectiveness rating, receiving a media replacement cost, receiving a number of operating parameters from a number of sensors, based at least in part on the operating parameters and the baseline media effectiveness rating, determining a media effectiveness model, based at least in part of the media effectiveness model, determining a loss in evaporative benefit cost over time, determining a time t when the loss in evaporative benefit cost exceeds the media replacement cost, and scheduling media replacement at time t.