Connected Mixing Valve for Hot Water Temperature Control
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Solution Overview
Problem
Domestic hot water systems often face issues with inconsistent temperature distribution and energy inefficiency, leading to scalding risks and reduced hot water availability, particularly in multi-user households, where one resident's usage can deplete the hot water supply, causing others to receive cold or lukewarm water.
Innovation Solution
A connected mixing valve (CMV) system is installed between the hot water heater and plumbing, allowing for real-time temperature adjustment and mixing of hot and cold water to meet varying demands of different appliances, ensuring safe and efficient hot water distribution while reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the temperature of the hot water heater is raised to increase hot water capacity, then the hot water capacity is improved, but the risk of scalding temperatures increases
Solution Approach 1:
A mixing valve is introduced as an intermediary device between the hot water heater and the water delivery system. This valve automatically mixes hot water from the heater with cold water from the supply line to deliver water at a safe, controlled temperature to fixtures, while the heater itself can operate at high temperatures to maximize hot water capacity.
Solution Approach 2:
The system changes the temperature parameter dynamically by adjusting the mixing ratio of hot and cold water. The mixing valve modulates the proportion of hot water (from the high-temperature heater) and cold water (from the supply line) to maintain a safe output temperature regardless of the heater's operating temperature or fluctuations in incoming water temperatures.
2Ease of operation
If one resident uses hot water extensively, then their water usage needs are met, but other residents experience reduced hot water availability
Solution Approach 1:
The mixing valve system enables each fixture to serve itself by automatically adjusting the mix of hot and cold water based on demand. This eliminates the need to pre-heat large volumes of water for potential future use, as each fixture can immediately provide the required amount of hot water by mixing on-demand, thereby serving the entire household's varying needs simultaneously.
Solution Approach 2:
The system transitions from a static hot water supply (where a fixed volume is heated in advance) to a dynamic mixing system that continuously adjusts the ratio of hot and cold water based on real-time demand at each fixture, allowing flexible response to varying usage patterns throughout the household.
3Adaptability or versatility
If hot water is delivered through pipes over distance, then water availability to multiple fixtures is improved, but energy loss in piping increases
Solution Approach 1:
The system performs preliminary heating only to the extent needed, by heating water to a high temperature in the heater and then immediately mixing with cold water in the pipes or at the fixture. This reduces the duration and extent of heat loss in the piping system, as the hot water spends less time traveling through pipes before being delivered and used.
Solution Approach 2:
The mixing valve acts as an intermediary that introduces cold water into the hot water stream within or near the plumbing system. This creates a cooler mixed water temperature that reduces heat loss during distribution, while still providing sufficient hot water capacity through the high-temperature heater.
4Object-affected harmful factors
If a connected mixing valve is installed to control temperature precisely, then scalding risks are eliminated, but device complexity increases
Solution Approach 1:
The connected mixing valve incorporates temperature sensors and control systems that continuously monitor the mixed water temperature and automatically adjust the mixing ratio to maintain the desired safe temperature. This feedback mechanism ensures scalding prevention while managing complexity through automated control rather than manual intervention.
Solution Approach 2:
The mixing valve is designed as a universal component that can be integrated into existing plumbing systems and serves multiple functions: temperature control, scalding prevention, and adaptation to various fixtures (showers, sinks, appliances). This multi-functionality justifies the added complexity by consolidating multiple safety and control features into a single device.
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 CMV system enhances hot water capacity, eliminates scalding risks, reduces energy consumption, and prioritizes user safety by allowing precise temperature control and efficient water usage across multiple appliances simultaneously.
Implementation Method 1
The connected device may be self-powered through the use of thermoelectric generators placed between the hot water line output and the cold water line input
Data Source
AI summary
Systems and techniques are described for using a connected device that measures water usage and controls temperature of a hot water line. In some implementations, a monitoring system monitors a property that includes one or more sensors located throughout the property and generates sensor data. The monitor control unit receives sensor data and based on the sensor data, determines an action that is likely to occur. Based on the action, determine a water temperature. Generate an instruction specifying the water temperature. The monitoring system includes a connected mixing valve that connects to a hot water supply line and a cold water supply line; receives the instruction specifying the water temperature; and, determines a first amount of hot water from the hot water supply line to combine with a second amount of cold water from the cold water supply line to produce water at the water temperature.