Circulation Pump Control for Stable Hot Water Temperature
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Solution Overview
Problem
Conventional water heaters experience temperature differences in hot water supply due to intermittent usage, particularly in high-demand settings like hospitals and restaurants, where flow rates vary, leading to inconvenience as users wait for hot water to reheat after temporary cessation.
Innovation Solution
Implementing a circulation pump control method with multiple operating modes: continuous, stop-after-use, and stop-and-restart modes to manage hot water circulation based on user activity and flow rates, ensuring consistent temperature by recirculating water between inflow and outflow pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the circulation pump operates only before hot water usage, then energy consumption is reduced, but temperature difference occurs when hot water is supplied after temporary cessation
Solution Approach 1:
The circulation pump operates dynamically based on real-time detection of hot water usage status. The controller activates the pump during detected usage periods to maintain temperature, and deactivates it during non-usage periods to save energy, creating an adaptive operational pattern that responds to changing conditions
Solution Approach 2:
The system uses feedback from usage detection (flow sensors or temperature sensors detecting hot water consumption) to control the circulation pump operation. When usage is detected, the pump operates to maintain temperature; when usage stops, the pump stops to conserve energy, creating a closed-loop control system
2Temperature
If the circulation pump operates continuously, then temperature consistency is improved, but energy consumption increases
Solution Approach 1:
The circulation pump operates periodically based on detected hot water usage patterns rather than continuously. The pump activates during usage periods and deactivates during non-usage periods, creating a periodic operational pattern that maintains temperature consistency only when needed, thereby reducing unnecessary energy consumption
3Temperature
If the circulation pump operates during varying flow rates, then temperature stability is maintained, but device complexity increases
Solution Approach 1:
The system automatically detects hot water usage status through sensors and autonomously controls the circulation pump operation without requiring complex external control systems. The pump self-adjusts its operation based on detected usage conditions, simplifying the overall control architecture while maintaining temperature stability during varying flow rates
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 method reduces temperature differences and electricity consumption by maintaining consistent hot water supply even with varying flow rates, enhancing user convenience and energy efficiency.
Implementation Method 1
a circulation pump provided on a bypass pipe connecting the inflow pipe into which direct water flows and the outflow pipe through which heated hot water flows out to each other
Implementation Method 2
a heat exchanger 20 that causes the direct water which enters through the inflow pipe 10 to exchange heat with air or water heated by a burner
Data Source
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AI summary
According to the present invention, a method for controlling the temperature of hot water by operating a circulation pump includes: a step of determining whether a user is using hot water; a step of determining whether one of the operation modes of the circulation pump is selected; and a step of operating the circulation pump to circulate hot water from the outflow tube to the inflow tube when a user is using hot water and selects one of the operation modes, wherein the circulation pump is disposed on a bypass tube connecting the inflow tube, through which source water flows, to the outflow tube, through which heated water is discharged. Accordingly, temperature deviations in the hot water discharged from a water heater can be reduced.