Local multiple pressure zone fresh water storage and supply system
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Solution Overview
Problem
Existing systems fail to maintain fresh water storage for extended periods during emergencies, such as natural disasters or city water contamination, as they cannot effectively manage pressure zones and integrate city water with private tank supplies to meet demand.
Innovation Solution
A fully automatic system with a high-pressure water supply pump station, low-pressure circulation pump station, private water tank, and automation control panel that manages pressure zones and integrates city water with private tank supplies using parallel centrifugal pumps and pressure modulation to ensure continuous fresh water supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water is stored in a private water tank for emergency supply, then water availability is improved, but water freshness deteriorates due to stagnation
Solution Approach 1:
The system divides the water storage and distribution into multiple pressure zones (high pressure zone above 40 psi and low pressure zone below 40 psi). This segmentation allows different water sources (city water and private tank water) to be managed separately in different zones, preventing stagnation while maintaining availability. The high pressure zone receives fresh city water while the low pressure zone uses stored water, ensuring water freshness is maintained in the stored water supply.
Solution Approach 2:
The system dynamically switches between city water and private tank water based on real-time pressure conditions. When city water pressure is sufficient, it supplies the high pressure zone; when pressure drops below 40 psi, the system automatically switches to using private tank water. This dynamic adaptation prevents water stagnation by continuously refreshing the stored water through pressure-driven flow, while maintaining reliable water availability during emergencies.
2Reliability
If city water and private tank water are integrated into a single distribution system, then water supply reliability is improved, but pressure management complexity increases
Solution Approach 1:
The system applies different pressure management strategies to different zones based on their specific needs. The high pressure zone (above 40 psi) is designed to receive and distribute city water directly, while the low pressure zone (below 40 psi) is designed to use private tank water. This local differentiation simplifies pressure management by assigning specific functions to specific zones, reducing the overall complexity while maintaining supply reliability.
Solution Approach 2:
The system uses a pressure threshold parameter (40 psi) to automatically determine water source selection and zone classification. When city water pressure exceeds 40 psi, the system switches to city water supply mode; when it drops below 40 psi, it switches to private tank water mode. This parameter-based control simplifies pressure management by providing clear, automated decision-making criteria, reducing operational complexity while ensuring reliable water supply.
3Productivity
If multiple pressure zones are created to manage water flow, then water distribution efficiency is improved, but system complexity increases
Solution Approach 1:
The system segments the distribution network into two pressure zones (high pressure above 40 psi, low pressure below 40 psi) to optimize water flow efficiency. This segmentation allows water to be distributed through appropriate pressure levels for different areas, improving overall distribution efficiency by matching pressure zones to demand patterns while keeping the segmentation simple and manageable.
Solution Approach 2:
The system uses a single pressure threshold parameter (40 psi) to define and manage the boundaries between high and low pressure zones. This parameter-based approach simplifies zone management by providing clear, automated criteria for water flow direction and source selection, improving distribution efficiency while minimizing the complexity of zone management through straightforward, rule-based 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
The system maintains fresh water for up to five days by efficiently managing pressure zones and integrating city water with private tank supplies, ensuring reliable water distribution during emergencies and peak usage periods, while minimizing energy consumption and preventing stagnant water.
Implementation Method 1
a high pressure water supply pump station... to manage water pressure limitation constraints and allow water to flow between different water pressure zones
Implementation Method 2
a low pressure water circulation pump station... to keep the water in a private water tank always fresh
Data Source
AI summary
A method to distribute water from a private water tank to a user site includes connecting the private water tank to three parallel low pressure Variable Frequency Drive (VFD) pumps, two parallel high pressure VFD pumps, a pressure reducing valve (PRV), a tank level control valve, a flow meter, two pressure gauges, and two pressure transducers; controlling the three parallel low and two high pressure VFD pumps using a PLC programmed with at least first, second, and third low pressure pump set operation curves (LPPSOCs) each specifying a low pressure pump operation set point (B) and a PRV operation set point (F) at each of first, second, and third flow rates and first and second high pressure pump set operation curves (HPPSOCs) each specifying a high pressure pump operation set point (G) and a high pressure pump energizing set point (E) at each of fourth and fifth flow rates.