Cold Water Spray Fume Cleansing with Demand-Based Temperature Control
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Solution Overview
Problem
Exhaust ventilation systems face inefficiencies in grease removal and fire safety due to temperature-dependent water quality in cold water spray systems, where water temperature increases, reducing grease removal efficiency and requiring accurate fire detection and temperature management.
Innovation Solution
A method to control the cold water spray system by determining the demand load and water temperature, maintaining a low temperature threshold, circulating water through a heat exchanger, and draining/replacing water to ensure efficient grease removal and fire safety responses, using sensors for demand load and temperature monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water is continuously used in the cold water spray system for grease removal, then the system operates continuously, but the water temperature increases and grease removal efficiency decreases
Solution Approach 1:
The system implements periodic draining and refilling of water in the cold water spray system. The controller monitors water temperature and activates the drain valve to discharge warmed water, then refills with fresh cold water from the water source. This periodic renewal maintains water temperature below the threshold where grease removal efficiency deteriorates, allowing continuous system operation without permanent loss of effectiveness
Solution Approach 2:
The system changes the temperature parameter of the water by periodically replacing it. When water temperature rises above a predetermined threshold, the system drains the warmed water and refills with colder water from the water source, thereby resetting the temperature parameter to maintain optimal grease removal conditions throughout continuous operation
2Reliability
If water temperature is maintained low for efficient grease removal, then grease removal efficiency is high, but energy is consumed to cool or replace water
Solution Approach 1:
The system discards warmed water from the cold water spray system when it exceeds the temperature threshold. Although this involves replacing water rather than recovering it, the principle applies in that the system eliminates the degraded resource (warmed water) and replaces it with fresh water from the water source, maintaining efficiency without requiring active cooling energy input
Solution Approach 2:
The system extracts or removes the warmed water from the cold water spray system through the drain valve when temperature thresholds are exceeded. By taking out the degraded water resource and replacing it with fresh cold water, the system maintains grease removal efficiency without consuming energy for active cooling processes
3Reliability
If the cold water spray system is activated for fire suppression, then fire safety response is provided, but water consumption increases
Solution Approach 1:
The system uses feedback from fire detection sensors to control water spray activation. When sensors detect fire conditions, the controller activates the water spray system to suppress the fire. After suppression or when the threat diminishes, the system can reduce or stop water spraying, thereby providing effective fire safety response while minimizing unnecessary water consumption through sensor-based feedback control
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
Maintains efficient grease removal and fire safety by managing water temperature and quality, enhancing the effectiveness of the cold water spray system in exhaust ventilation systems.
Implementation Method 1
cold water spray system to maintain a low temperature of water... enabling efficient removal of grease from the exhaust hood
Implementation Method 2
circulating water through a heat exchanger
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A system and method is provided for demand-based control of a cold water spray system of an exhaust ventilation system. Embodiments include determining a demand load of a cooking appliance that generates cooking effluent in a vicinity of an exhaust hood, and determining a temperature of water in the cold water spray system. The cold water spray system is controlled in response to at least one of the determined appliance demand load and the determined temperature of water in the cold water spray system to maintain a low temperature of water in the cold water spray system below a predetermined temperature threshold, thereby enabling efficient removal of contaminants from the exhaust hood by the cold water spray system.