Hot Water Shut-Off Valve Assembly for Tepid Water Recirculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Home and industrial water distribution systems often fail to provide hot water when it is needed, leading to waste and inefficiency, particularly in fixtures located far from the water heater or with poorly insulated pipes, as hot water cools and becomes tepid, causing users to wait for the water to reheat or use cold water instead.
Innovation Solution
A valve assembly with a shut-off valve and bypass valve system that automatically controls the flow of hot water based on temperature, pressure, and flow rate, allowing for recirculation of cooled water back to the water heater, ensuring hot water is available when needed while minimizing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot water is stored in pipes for later use, then hot water is available when needed, but the water cools down and becomes cold or tepid over time
Solution Approach 1:
The system performs preliminary action by recirculating hot water through the pipes before it is needed, ensuring that hot water is already present at the fixture when the user opens the valve. The controller activates the pump to circulate water through the recirculation loop, preemptively replacing cooled water with fresh hot water from the water heater.
Solution Approach 2:
The system maintains continuity of useful action by continuously or periodically recirculating hot water through the distribution system. Rather than allowing water to sit stagnant in pipes, the pump continuously moves water through the loop, ensuring hot water remains available without interruption.
2Reliability
If the pump operates continuously to maintain hot water circulation, then hot water is always available, but energy consumption increases
Solution Approach 1:
The system uses periodic action by operating the pump only when necessary rather than continuously. The controller monitors system conditions and activates the pump at intervals or in response to specific triggers (such as detecting cold water at a fixture), thereby maintaining hot water availability while minimizing energy consumption during periods when hot water is already present in the pipes.
Solution Approach 2:
The system implements feedback by using sensors to detect water temperature or flow conditions at various points in the system. When the sensor detects that hot water is no longer present at a fixture, it sends a signal to the controller, which then activates the pump to recirculate hot water. This feedback mechanism ensures the pump operates only when needed, optimizing energy efficiency.
3Temperature
If cold water is allowed to flow out of the fixture until hot water reaches the desired temperature, then hot water becomes available, but water waste occurs
Solution Approach 1:
The system performs preliminary action by recirculating hot water through the pipes before the user needs it, ensuring that hot water is already present at the fixture when the valve is opened. This eliminates the need for the user to drain cold water to wait for hot water to arrive.
Solution Approach 2:
The system maintains continuous circulation of hot water through the recirculation loop, ensuring that hot water is constantly present in the distribution system. This continuous action prevents the need to waste water by draining cold water to wait for hot water to arrive at the fixture.
4Temperature
If the hot water valve is left open for some time to allow hot water to reach the fixture, then hot water becomes available, but time is wasted waiting
Solution Approach 1:
The system performs preliminary action by recirculating hot water through the pipes before the user opens the fixture valve. This ensures that hot water is already present at the fixture, eliminating the waiting time that would otherwise be required for hot water to travel from the water heater.
Solution Approach 2:
The system maintains continuous circulation of hot water through the distribution system, ensuring that hot water is constantly available at all fixtures. This continuous action eliminates the need for users to wait for hot water to arrive, as it is already present in the pipes.
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 ensures instant hot water availability during peak demand periods, reduces water waste, and conserves energy by only reheating water when necessary, maintaining hot water supply without constant pump operation.
Implementation Method 1
a bypass valve with an inlet and an outlet that permits recirculating flow of water from a hot water line
Implementation Method 2
The shut-off valve is configured to move automatically from the open position to the closed position in a controlled manner to limit discharge, from the hot water outlet, of water having a temperature below a desired level
Data Source
AI summary
A valve assembly for a water circulation system includes a bypass valve with an inlet and an outlet that permits recirculating flow of water from a hot water line of the water circulation system. The valve assembly also includes a shut-off valve with a valve body having a hot water inlet and a hot water outlet configured to be coupled to a fixture of the water circulation system. The shut-off valve is located proximate the fixture and operating in an open position allowing water to flow to the hot water outlet and a closed position restricting water from flowing to the hot water outlet. The shut-off valve is configured to move automatically from the open position to the closed position in a controlled manner to limit discharge, from the hot water outlet, of water having a temperature below a desired level.