Solar Fluid Heating System with Flow Control for Pathogen Inactivation
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Solution Overview
Problem
Conventional fluid heating systems for water pasteurization are often expensive to operate, require significant energy to maintain temperature, and lack efficient mechanisms for pathogen inactivation, especially in remote or off-grid settings.
Innovation Solution
A solar fluid heating system with a parabolic mirror focusing sunlight on a fluid heating tube, combined with a flow-control assembly using a pathogen inactivation model based on temperature and exposure time, and a preheat heat exchanger for efficient energy use, allowing for the inactivation of pathogens in water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluid heating systems are used for water pasteurization, then pathogen inactivation can be achieved, but operating costs are high and significant energy is required to maintain temperature
Solution Approach 1:
The system performs preliminary heating of water using solar energy before pasteurization, storing thermal energy in the water itself. This preliminary action reduces the additional energy needed during the actual pasteurization process, as the water already contains accumulated solar heat that can be utilized for pathogen inactivation.
Solution Approach 2:
The system changes the temperature parameter dynamically during operation. Water is heated to pasteurization temperatures (typically 60-80°C) and maintained at these levels using solar energy. The flow control valve adjusts parameters to ensure adequate residence time at pasteurization temperatures, achieving pathogen inactivation while optimizing energy usage through temperature parameter management.
2Reliability
If conventional fluid heating systems maintain temperature continuously, then pasteurization effectiveness is ensured, but operating costs increase
Solution Approach 1:
The system uses the heated water itself as the heat source for maintaining temperature. Hot water from the pasteurization process flows through heat exchange pathways that transfer thermal energy to incoming cooler water, allowing the system to self-regulate and maintain pasteurization temperatures without additional external energy input or complex active control systems.
Solution Approach 2:
The system maintains continuous pasteurization effectiveness by ensuring water continuously flows through the heated pathways at controlled rates. The flow control valve ensures adequate residence time in the heated zones, and the heat exchange between incoming and outgoing water streams provides continuous thermal energy transfer, maintaining pasteurization effectiveness without interruption or additional energy cost.
3Productivity
If flow rate is increased in fluid heating systems, then productivity improves, but pathogen inactivation may be insufficient
Solution Approach 1:
The system dynamically adjusts the flow rate through the use of a flow control valve that responds to temperature conditions. When solar heating provides sufficient temperature, the valve allows higher flow rates for increased productivity. When temperatures are lower or during transitional periods, the valve restricts flow to ensure adequate residence time for pathogen inactivation. This dynamic adjustment optimizes both productivity and reliability based on real-time conditions.
Solution Approach 2:
The system incorporates feedback through temperature sensing and flow control mechanisms. Temperature sensors monitor the water temperature throughout the heating pathways, and this information feeds back to the flow control valve, which adjusts flow rate accordingly. This feedback loop ensures that flow rate is optimized to maintain both high productivity and sufficient pathogen inactivation by matching flow conditions to actual thermal conditions in the system.
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 effectively pasteurizes water using solar energy with minimal human intervention and energy consumption, providing a reliable and cost-effective solution for remote areas by efficiently inactivating pathogens in water.
Implementation Method 1
a solar collection system configured for focusing sunlight on a focal axis
Implementation Method 2
solar collection system configured for focusing sunlight on a focal axis
Implementation Method 3
a preheat heat exchanger configured to utilize fluid exiting the fluid heating system to heat fluid entering the fluid heating system
Data Source
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AI summary
A fluid heating system (100) may include a solar collection system (102) configured for focusing sunlight on a focal axis (103), an elongated flow element (150) arranged and configured for transporting fluid along the solar collection system (102) at the focal axis (103), and a flow-control assembly (140) comprising thermostatic valves configured to control the flow of the fluid in the elongated flow element (150) such that pathogens present in the fluid are substantially inactivated before the fluid exits the fluid heating system (100). A method of operating a fluid heating system (100) wherein the fluid heating system (100) comprises a parabolic solar collector and a support structure may also be provided.