External Smart Switch for Hot Water Recirculation Pump Energy Control
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Solution Overview
Problem
Existing hot water recirculation systems in households require costly upgrades to smart pump systems, especially for those with manual or pulse mode pumps, and lack efficient energy management, particularly in regions with limited hot water usage patterns.
Innovation Solution
An external microcontroller-based smart switch is connected between the power source and the pump to convert existing 'dumb' pumps into smart pumps, utilizing usage data and temperature sensors to optimize pump operation in pulse mode, reducing energy consumption by limiting hot water circulation only to usage periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an external smart control unit is added to convert existing pumps into smart pumps, then energy management efficiency is improved and cost of upgrade is reduced, but device complexity is increased
Solution Approach 1:
An external smart control unit is introduced as an intermediary device between the power source and the existing pump. This control unit receives power, processes usage data from temperature sensors and flow meters, and intelligently controls pump operation. By placing the smart control logic in a separate external unit rather than replacing the entire pump, the system achieves improved energy management while minimizing disruption to existing infrastructure and reducing upgrade costs.
2Reliability
If the pump operates continuously to provide instant hot water, then hot water availability is improved, but heat energy loss is increased
Solution Approach 1:
The system employs temperature sensors positioned at strategic locations in the hot water distribution system and flow meters to monitor actual water usage. The external smart control unit continuously receives this feedback data and dynamically adjusts pump operation accordingly. When usage is detected or predicted based on patterns, the pump activates to maintain hot water availability. When no usage is detected, the pump reduces or stops operation, thereby minimizing heat energy loss in the circulation system while maintaining reliability when needed.
Solution Approach 2:
The pump operation transitions from static continuous operation to dynamic variable operation. The external smart control unit adjusts the pump's operational state in real-time based on actual system conditions, usage patterns, and temperature readings. This dynamic control allows the system to optimize between providing instant hot water and minimizing energy loss by adapting pump activity to actual demand rather than maintaining constant circulation.
3Ease of manufacture
If existing dumb pumps are converted to smart pumps using an external control unit, then upgrade cost is reduced, but manufacturing precision is compromised
Solution Approach 1:
The smart pump functionality is segmented into separate independent components: the existing pump hardware remains unchanged, while a new external smart control unit is added. This control unit contains the microcontroller, temperature sensors, flow meters, and intelligence required for smart operation. By segmenting the smart functionality into a separate controllable unit rather than integrating it into the pump motor itself, the system allows existing pumps to be upgraded without requiring precision manufacturing modifications to the original pump assembly, thereby reducing upgrade costs while maintaining the precision of both the original pump and the new control unit.
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 the conversion of existing pumps into smart systems that minimize heat energy loss and provide instant hot water availability while reducing energy consumption by adapting to household usage patterns, making it cost-effective and efficient for sporadically used systems.
Implementation Method 1
a temperature sensor connected to the microcontroller in the switch unit, in order to sense a temperature change, such as when a hot water tap in a hot water system is turned on, by measuring an increase in temperature
Data Source
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AI summary
An external control unit to be connected between a power source and an electrically driven pump to act as a smart switch to convert a "dumb" pump into a smart pump. The control system of this invention comprises a microcontroller-operated switch, located between the power source and the pump, or other fluid flow control device to be operated by electricity, and which can be programmed to record usage data of, e.g., hot water, by the household; it sets up the operating times in accordance with such usage. A temperature sensor is connected to the microcontroller to sense a temperature change, in a hot water system is turned on, by measuring an increase in temperature to indicate flow through the hot water pipe, and to record such data. This will determine, in the context of a hot water system, when the pump should be activated to bring up hot water.