Fixture Shut-Off and Bypass Valve for Instant Hot Water
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Solution Overview
Problem
Home and industrial water distribution systems often fail to provide hot water when needed, leading to waste and inefficiency, particularly in fixtures distant from the water heater or with poorly insulated pipes, as hot water cools and becomes tepid, requiring users to wait or use cold water until the system re-heats it, resulting in water waste and inefficiency.
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 recirculation of cooled water back to the heater, ensuring hot water is available when needed without continuous pumping, thus reducing waste and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot water is continuously circulated through the piping system, then hot water is always available at fixtures, but energy is wasted heating water that cools and circulates unnecessarily
Solution Approach 1:
The system uses a timer-controlled pump to circulate hot water periodically rather than continuously. The pump operates at predetermined times (e.g., morning and evening) when hot water demand is likely, ensuring availability while avoiding energy waste from continuous circulation. This periodic operation resolves the contradiction by providing reliable hot water access without the penalty of constant energy consumption.
2Loss of time
If a bypass valve is installed to drain cooled water from hot water lines, then hot water becomes available faster, but water is wasted flowing down the drain
Solution Approach 1:
The system incorporates a temperature sensor that monitors water temperature at the fixture. When the sensor detects that hot water has arrived (temperature exceeds threshold), it automatically signals the bypass valve to close, stopping the draining action. This feedback mechanism ensures the bypass valve operates only as long as needed to clear cooled water, minimizing water waste while still reducing wait time for hot water availability.
3Reliability
If the hot water valve is left open to flush out cooled water, then hot water is available, but water flows wastefully through the drain
Solution Approach 1:
The system uses a temperature-actuated valve that automatically opens to allow hot water to the fixture when needed and closes when hot water is available. The valve monitors its own operational need through temperature feedback, opening only long enough to deliver hot water without requiring user intervention or causing unnecessary water waste. This self-regulating mechanism resolves the contradiction by providing reliable hot water supply while eliminating wasteful continuous flow.
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 at fixtures, reducing water waste and energy usage by recirculating cooled water and only heating water when needed, maintaining hot water supply during peak demand periods while conserving energy and extending pump life.
Implementation Method 1
a recirculation pump that recirculates water from the hot water line
Implementation Method 2
a heat exchanger that is positioned to receive the outgoing hot water and the incoming cold water and to transfer heat between the outgoing hot water and the incoming cold water through a wall of the heat exchanger
Implementation Method 3
a thermal sensor that is positioned to sense a temperature of the water at the hot water outlet
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.