Energy efficient water heater
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Solution Overview
Problem
Conventional water heaters fail to maintain a consistent output water temperature, leading to water and fuel wastage as users adjust the temperature by mixing cold and hot water, especially in varying input water temperature conditions.
Innovation Solution
An energy-efficient water heater system that includes a controller, input water temperature sensor, user interface, heating unit, and proportional flow restrictor to adjust the flow rate of output water based on user-set temperature, along with safety features like propane and carbon monoxide sensors to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional water heaters produce output water at fixed high temperature (130-140°F), then heating performance is improved, but water waste increases due to mixing with cold water
Solution Approach 1:
The water heater dynamically adjusts the output water temperature based on the user's desired temperature setting rather than maintaining a fixed high temperature. The controller modulates the heating element and proportioning valve to deliver water at the exact temperature requested, eliminating the need for users to mix hot and cold water manually.
Solution Approach 2:
The system incorporates temperature sensors that continuously monitor the output water temperature and provide feedback to the controller. The controller uses this feedback to adjust the heating power and flow proportioning in real-time, ensuring the output temperature matches the user's setting precisely, thereby preventing water waste from temperature mixing.
2Device complexity
If conventional water heaters operate without flow rate control, then device complexity is reduced, but temperature consistency deteriorates when input water temperature varies
Solution Approach 1:
The controller continuously monitors the input water temperature via a temperature sensor and adjusts the heating element power and proportioning valve opening accordingly. This closed-loop feedback system maintains consistent output water temperature despite variations in input water temperature, while keeping the control mechanism relatively simple through automated regulation.
3Device complexity
If water heaters lack safety sensors for propane and carbon monoxide, then device complexity and cost are reduced, but safety reliability deteriorates
Solution Approach 1:
The water heater system performs self-monitoring of safety parameters through integrated propane and carbon monoxide sensors. The controller continuously checks propane levels and carbon monoxide concentrations, automatically alerting users when thresholds are exceeded, thereby enabling the system to monitor its own safety status without external intervention.
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 maintains desired output water temperatures with reduced fuel consumption and enhanced safety by dynamically adjusting flow rates and alerting users to hazardous conditions, thereby conserving energy and preventing scalding.
Implementation Method 1
a heating unit configured to heat the input water to produce the output water
Implementation Method 2
an input water temperature sensor configured to detect a temperature of the input water
Implementation Method 3
a propane sensor configured to detect a propane level being over a propane level threshold and produce a first alert to the user
Implementation Method 4
a carbon monoxide sensor configured to detect a carbon monoxide level being over a carbon monoxide threshold and produce a second alert to the user
Data Source
AI summary
Apparatuses of an energy efficient water heater and methods for controlling the same are disclosed. In one embodiment, a water heater may include a water inlet configured to receive input water, an input water temperature sensor configured to detect a temperature of the input water, a user interface unit configured to receive an output water temperature setting selected by a user, a controller configured to determine a flow rate of an output water based on the input water temperature and the output water temperature setting, a heating unit configured to heat the input water to produce the output water, the controller is further configured to control the heating unit and a proportional flow restrictor to produce the flow rate of the output water, and a water outlet configured to transfer the output water at the flow rate of the output water.