Water Heater Mixing Valve Flow Detection via Temperature Sensing
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Solution Overview
Problem
Conventional water heater appliances with mixing valves rely on flowmeters or flow sensors to determine water flow, which can be unreliable due to clogging or debris, especially in systems with hard water or debris, making it impractical for space-constrained or expensive installations to provide large volumes of heated water efficiently.
Innovation Solution
A water heater appliance that uses temperature sensors to determine water flow through a conduit by measuring temperature changes, allowing the mixing valve to adjust and regulate water temperature without relying on flowmeters or flow sensors, thereby ensuring efficient operation and maintaining desired temperature settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flowmeters or flow sensors are used to determine water flow, then water flow detection can be achieved, but the system becomes unreliable due to clogging or debris
Solution Approach 1:
The patent replaces mechanical flow detection devices (flowmeters and flow sensors with moving components) with a thermal-based detection system using temperature sensors. The system detects water flow by measuring temperature changes in the water conduit, eliminating mechanical parts that can clog or malfunction due to hard water or debris.
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to detect water flow. Instead of directly measuring flow (which requires mechanical components), the system measures temperature changes that occur when water flows through the conduit, using temperature as a mediator to infer flow conditions without direct mechanical contact.
2Quantity of substance
If large water heater appliances with large tanks are used, then sufficient heated water volume is provided, but large amount of space is occupied
Solution Approach 1:
The patent changes the temperature parameter of water storage by maintaining water at higher temperatures in the tank, then using a mixing valve to adjust the temperature to usable levels. This allows the system to provide large volumes of heated water without requiring proportionally large tank sizes, as the thermal energy is concentrated at higher temperatures.
Solution Approach 2:
The patent introduces a dynamic mixing valve system that can adjust the ratio of hot water from the tank to cold water from the supply line. This dynamic adjustment allows the system to adapt to different hot water demand levels, providing large volumes when needed while maintaining a relatively compact tank size.
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
This solution enables reliable detection of water flow and temperature regulation, ensuring efficient operation and effective use of space and resources, even in systems with limited space or high maintenance concerns, by using temperature sensors to manage the mixing valve's operation.
Implementation Method 1
A temperature sensor positioned downstream of the mixing valve measures a temperature of water within the hot water conduit
Implementation Method 2
The mixing valve mixes such high temperature water with relatively cool water in order to bring the temperature of such water down to suitable and/or more usable temperatures
Implementation Method 3
Heating elements, such as gas burners, electric resistance elements, or induction elements, heat water within the tank during operation of such water heater appliances
Data Source
AI summary
A water heater appliance and a method for operating the same are provided. The method includes receiving a first temperature measurement from a temperature sensor of the water heater appliance, receiving a second temperature measurement from the temperature sensor of the water heater appliance, and establishing if water is flowing through a conduit of the water heater appliance based at least in part on the first and second temperature measurements.