ServoCool water evaporative refrigeration cycle
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Solution Overview
Problem
Conventional evaporative cooling systems face inefficiencies and variability in performance due to changes in air mass loading and atmospheric conditions, lacking a stable operating state and effective integration of air and water cooling processes.
Innovation Solution
The ServoCool system employs a two-stage Indirect/Direct Evaporative Cooling (IDEC) cycle with a closed loop topology, where a cold water generator and cold air generator are connected in a positive feedback loop, using a first stage heat exchanger to chill air and warm water, which is then reused in a second stage evaporative cooler to achieve convergence near the ambient wet bulb temperature, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional evaporative cooling systems operate under changing atmospheric conditions, then cooling is provided, but performance varies and stability is poor
Solution Approach 1:
The patent implements a closed-loop control system with temperature sensors monitoring both inlet air temperature and cooling water temperature. The controller adjusts the water flow rate through the heat exchanger based on the temperature differential, creating a feedback mechanism that maintains stable cooling performance despite variations in atmospheric conditions. This self-regulating system ensures consistent operation across different environmental scenarios.
2Productivity
If air mass loading changes in conventional systems, then cooling demand varies, but system performance becomes unpredictable
Solution Approach 1:
The system employs dynamic adjustment of water flow rate in response to changing air mass loading conditions. The controller continuously monitors the temperature differential between inlet air and cooling water, automatically modulating the water flow to match the actual cooling demand. This dynamic response capability allows the system to maintain optimal performance whether the cooling load is high or low, ensuring both productivity and operational consistency.
3Ease of manufacture
If indirect and direct cooling stages are separately operated, then each stage functions independently, but overall efficiency is limited
Solution Approach 1:
The patent integrates the indirect evaporative cooling stage and direct evaporative cooling stage into a unified system where the cooling water from the indirect stage feeds into the direct stage. This merging creates a cascaded configuration where the warm water exiting the heat exchanger becomes the input for the evaporative cooler, maximizing the utilization of thermal energy and improving overall cooling efficiency without complicating the manufacturing or installation process.
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 results in robust performance with minimal impact from load or atmospheric changes, achieving high relative humidity and efficient cooling, with the system converging within 0.5 to 5.0 degrees Fahrenheit of the ambient wet bulb temperature, outperforming other IDEC architectures in terms of size, cost, and energy efficiency.
Implementation Method 1
flowing the air through the heat exchanger to cool the incoming air and produce chilled air
Implementation Method 2
circulating water through the heat exchanger to transfer heat from the incoming air into the water
Implementation Method 3
flowing the chilled air through the water-air cooler to cool the water and produce chilled water for reuse in the heat exchanger
Data Source
AI summary
The technology disclosed is a two stage Indirect/Direct Evaporative Cooling (IDEC) cycle whose novel closed loop topology compels system convergence to a stable operating state, wherein air cooling takes place mostly in the indirect stage. The direct stage then serves principally as a water chiller for that process.