Furnace Fire-Rate Control During Thermostat Feedback Loss
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Solution Overview
Problem
Conventional furnace systems are unable to effectively regulate the generation and output of heated supply air to achieve desired climate parameters in a space when communication links with external temperature feedback sources are severed, leading to inefficient operation.
Innovation Solution
A furnace controller that determines a rolling average furnace run time and segments it into operational periods associated with distinct fire rates, allowing the system to operate independently and adjust heat output without relying on external temperature feedback, implementing these fire rates sequentially to maintain desired temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional furnace systems rely on external temperature feedback sources for control, then they can achieve desired climate parameters, but they become unable to operate effectively when communication links are severed
Solution Approach 1:
The furnace controller determines a rolling average furnace run time based on previous run cycles and uses this self-generated data to segment operational time periods and implement distinct fire rates. This self-service approach eliminates dependency on external temperature feedback sources, allowing the system to autonomously maintain desired climate parameters even when communication links are severed.
Solution Approach 2:
The system pre-calculates and stores the rolling average furnace run time from historical operation data before communication failures occur. This preliminary action enables the controller to have ready-to-use operational parameters segmented into distinct fire rates, allowing immediate autonomous operation without waiting for external feedback during communication outages.
2Productivity
If the furnace system operates with segmented operational periods and distinct fire rates, then it can adjust heat output efficiently, but it requires sophisticated control algorithms
Solution Approach 1:
The rolling average furnace run time is segmented into multiple operational time periods, with each period associated with a distinct fire rate. This segmentation allows the system to adjust heat output in discrete steps rather than continuous modulation, improving heating efficiency while using relatively simple control logic based on time-based segmentation rather than complex real-time calculations.
Solution Approach 2:
The system changes the fire rate parameter across different operational time periods within a run cycle. By varying this key operational parameter based on the segmented time periods derived from rolling average data, the system achieves efficient heat output adjustment without requiring complex control algorithms, as the parameter changes follow a predetermined pattern based on historical performance.
3Adaptability or versatility
If the furnace controller operates independently without external temperature feedback, then it maintains operational autonomy, but it must rely on historical data which may not reflect current conditions
Solution Approach 1:
While operating autonomously without external temperature feedback during communication outages, the system uses internal feedback from its own historical run cycle data. The rolling average furnace run time provides a self-generated feedback mechanism that reflects the system's actual performance under similar conditions, allowing adaptive operation with reasonable temperature control precision despite lacking external temperature measurements.
Solution Approach 2:
The system creates a virtual model of optimal operation by copying and analyzing patterns from previous successful run cycles. This virtual representation of historical performance serves as a substitute for real-time external temperature feedback, allowing the controller to replicate effective operational patterns and maintain adequate temperature control precision through analogy to past successful operations.
Data Source
AI summary
A furnace system for a heating, ventilation, and air conditioning (HVAC) system includes a furnace controller configured to determine a rolling average furnace run time of the furnace system based on a plurality of previous run cycles of the furnace system. The furnace controller is configured to segment the rolling average furnace run time into a plurality of operational time periods, wherein each operational time period is associated with a distinct fire rate of a plurality of distinct fire rates the furnace system. The furnace controller is also configured to operate the furnace system to sequentially implement the plurality of distinct fire rates associated with the plurality of operational time periods.