Integrated hot water recirculation system
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Solution Overview
Problem
Hot water in home piping systems cools over time, leading to inefficient use of heated water and increased energy consumption, as cooled water is dispensed before newly heated water reaches fixtures, and existing recirculation systems lack efficiency and customization.
Innovation Solution
A hot water recirculation system with a pump connected to the hot water heater that periodically recirculates hot water through pipes, using valves at fixtures to selectively return cooled water to the heater, and integrates with a monitoring system to automate and customize recirculation based on usage patterns and sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot water is continuously recirculated through all pipes, then hot water availability at fixtures is improved, but energy consumption increases
Solution Approach 1:
The system divides the piping network into multiple zones with independent recirculation control. Each zone can be recirculated independently based on its specific usage patterns, allowing the system to maintain hot water availability where needed while avoiding energy waste in zones that are not currently in use.
Solution Approach 2:
Instead of continuous recirculation, the system uses periodic recirculation cycles triggered by sensor data and usage patterns. The recirculation pump operates intermittently based on predicted demand, maintaining hot water availability while significantly reducing energy consumption compared to continuous operation.
2Reliability
If recirculation is applied to all pipe sections, then hot water availability is improved, but water waste increases
Solution Approach 1:
The system applies recirculation selectively to specific pipe sections and fixtures based on their individual usage characteristics. By analyzing sensor data and usage patterns, the system identifies which locations require recirculation and applies it only there, reducing overall water waste while maintaining hot water availability at critical fixtures.
3Device complexity
If recirculation system is simplified without monitoring integration, then device complexity is reduced, but automation and customization capability deteriorates
Solution Approach 1:
The monitoring system serves multiple functions: it tracks usage patterns, predicts demand, controls recirculation timing, and provides user interface capabilities. By integrating these diverse functions into a single platform, the system achieves high automation capability without proportionally increasing overall complexity.
Solution Approach 2:
The system automatically learns usage patterns from sensor data and autonomously determines recirculation schedules without requiring manual programming or user intervention. This self-learning capability enables customization and automation while keeping the user interface simple and the overall system manageable.
4Use of energy by moving object
If recirculation operates on fixed timing, then energy efficiency is improved by reducing unnecessary heating, but hot water availability reliability deteriorates
Solution Approach 1:
The system uses sensor data from fixtures and pipes as feedback to dynamically adjust recirculation timing. By continuously monitoring temperature, flow, and usage patterns, the system adapts its recirculation schedule to actual conditions, ensuring hot water availability is maintained while optimizing energy efficiency based on real-time needs rather than fixed timing.
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
Reduces water waste and energy consumption by ensuring hot water is consistently available at fixtures, optimizing recirculation to frequently used areas and conserving energy by minimizing heating of less frequently used pipes, while also detecting potential issues like leaks and notifying users.
Implementation Method 1
a pump connected to the outlet of a hot water heater that can pump recently heated water through the pipes
Implementation Method 2
water is typically heated at a central location, for instance, by a water heater in a basement
Implementation Method 3
The pump communicates with one or more valves installed at different fixtures (e.g., sinks, showers, bath tubs, appliances) of the home, where the valves can open to allow water in the hot water pipes to be returned to the hot water heater
Data Source
AI summary
A monitoring system that is configured to monitor a property is disclosed. The monitoring system includes a sensor that is configured to generate sensor data that reflects an attribute of the property. The monitoring system further includes a hot water circulation system that is configured to selectively circulate hot water between a hot water source and at least one of multiple locations of the property. The monitoring system further includes a monitor control unit that is configured to receive and analyze the sensor data. The monitor control unit is further configured to determine to circulate hot water between the hot water source and a first location of the multiple locations of the property and to bypass circulating hot water between the hot water source and a second location of the multiple locations of the property.