Air Handler Heating Control for Hot Water Usage Detection
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Solution Overview
Problem
Air handler systems using a water heater as a heat source face challenges in accurately determining whether hot water is used during heating, leading to potential dissatisfaction due to unmet set temperatures, without considering additional costs for separate sensors.
Innovation Solution
A method that detects changes in the flow rate and temperature of tap water supplied to the water heater, determining hot water usage by correlating these changes, and halting heating to supply hot water at a set temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate flow sensor is installed to detect hot water usage, then measurement precision is improved, but device complexity and production cost increase
Solution Approach 1:
The water heater itself performs the detection function by monitoring its own operational parameters (flow rate and temperature changes) rather than requiring an external flow sensor. The controller detects hot water usage by analyzing changes in flow rate and temperature of water supplied to the water heater, allowing the system to self-diagnose usage conditions without additional measurement devices.
Solution Approach 2:
The existing water heater system performs multiple functions: heating water for domestic use, heating air for space heating, and now also detecting hot water usage conditions. The same flow rate and temperature sensors used for controlling water heating are repurposed to detect whether hot water is being consumed during heating operation, eliminating the need for separate detection devices.
2Ease of operation
If hot water is supplied during heating operation, then user convenience is improved, but heating temperature stability deteriorates
Solution Approach 1:
The controller continuously monitors flow rate and temperature changes and uses this feedback to detect when hot water usage begins during heating operation. When usage is detected, the controller automatically adjusts or halts heating operation to prioritize hot water supply, ensuring the water reaches the desired temperature while managing the impact on heating temperature stability.
Solution Approach 2:
The system dynamically adjusts its operation mode based on real-time detection of hot water usage conditions. When hot water consumption is detected during heating, the system transitions from stable heating operation to a mode that prioritizes hot water supply, allowing flexible adaptation to user needs while managing temperature trade-offs.
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
Enables accurate detection of hot water usage without additional sensors, preventing user dissatisfaction by ensuring hot water is supplied at the set temperature, thus improving user experience without increasing production costs.
Implementation Method 1
an air handler system using a water heater as a heat source
Implementation Method 2
an air handler is a device that heats air by exchanging heat between a heat medium provided from a heat source and outside air
Data Source
AI summary
A method for determining whether hot water is used during heating of an air handler system which uses a water heater as a heat source and supplies hot air through a duct for heating is disclosed. The method includes: (a) detecting a flow rate change of tap water supplied to the water heater; (b) detecting a temperature change of the tap water supplied to the water heater; and (c) determining that hot water is used during heating when the flow rate change of the tap water in step (a) and the temperature change of the tap water in step (b) are detected at the same time.