Modulating Furnace Quick Heat Algorithm for Reduced Conditioning Time
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Solution Overview
Problem
Traditional HVAC systems are inefficient in determining when and how to operate heat exchangers to quickly and efficiently provide conditioning to enclosed spaces, leading to inefficient heat exchange and extended time to satisfy heating demands.
Innovation Solution
A controller for a modulating furnace in HVAC systems executes a quick heat algorithm to operate in a quick heat mode for a threshold time period and then switches to a modulating heat mode, adjusting fuel input and exhaust flow rates based on the number of recent heating cycles and elapsed time to optimize heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional HVAC systems operate heat exchangers using conventional control methods, then the system maintains stable operation, but the heat exchange efficiency is poor and conditioning time is extended
Solution Approach 1:
The patent implements dynamic operation modes for the heat exchanger, switching between quick heat mode (high capacity) and modulating heat mode (variable capacity) based on real-time conditions. The controller adjusts the operation mode dynamically rather than using fixed conventional control, enabling the system to respond adaptively to changing heating demands and improve both heat exchange efficiency and reduce conditioning time.
Solution Approach 2:
The system changes operational parameters by implementing a quick heat algorithm that modifies the heat exchanger's operation mode, capacity level, and cycle timing. The controller executes algorithms that adjust fuel input rates, exhaust flow rates, and operating modes based on elapsed time and heating cycle counts, transforming the static conventional operation into a dynamically optimized process.
2Loss of time
If the modulating furnace operates in quick heat mode continuously, then conditioning time is reduced, but energy efficiency deteriorates
Solution Approach 1:
The patent implements periodic switching between quick heat mode and modulating heat mode based on elapsed time thresholds and heating cycle counts. The controller executes the quick heat algorithm to determine when to switch modes, creating a rhythmic pattern of high-capacity operation followed by efficient modulating operation. This periodic action prevents continuous high-energy consumption while maintaining rapid conditioning capability when needed.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller monitors elapsed time, heating cycle counts, and operational modes to dynamically adjust the furnace operation. The quick heat algorithm uses feedback from these parameters to determine mode switching timing, ensuring that quick heat mode is activated only when beneficial and transitioning to energy-efficient modulating mode when appropriate, thereby optimizing the balance between conditioning speed and energy consumption.
3Adaptability or versatility
If the furnace operates with fixed cycling patterns, then system simplicity is maintained, but adaptability to varying heating demands is reduced
Solution Approach 1:
The patent implements a self-service control system where the modulating furnace automatically executes the quick heat algorithm to determine its own operation mode based on monitored parameters. The controller autonomously decides when to switch between quick heat and modulating modes without external intervention, using built-in logic that evaluates elapsed time and heating cycle counts. This self-service approach enhances adaptability while keeping the control system relatively simple by avoiding complex external control infrastructure.
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 approach improves heat exchange efficiency and reduces conditioning time by strategically switching between quick heat and modulating heat modes, enhancing the overall performance of HVAC systems.
Implementation Method 1
one or more heat exchangers configured to place an air flow in a heat exchange relationship with a working fluid circulated by the heat exchanger
Implementation Method 2
one or more burners configured to receive fuel from a fuel source
Data Source
AI summary
A system includes a modulating furnace and control circuitry. The control circuitry is configured to receive a call for heating associated with a quick heat cycle. In response to the call for heating, the control circuitry is also configured to operate the modulating furnace in a quick heat operating mode for a threshold time period. Subsequent to the threshold time period, the control circuitry is also configured to operate the modulating furnace in a modulating heat operating mode.