HVAC Temperature Rate Control for Legacy Equipment Integration
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Solution Overview
Problem
Existing HVAC systems face challenges in providing advanced control capabilities while maintaining interoperability with both communicating and non-communicating legacy equipment, limiting consumer choice and retrofitting options.
Innovation Solution
A controller-based system that operates HVAC equipment using a control plan based on a target time, allowing for the integration of both communicating and non-communicating equipment, and adjusts the control plan based on actual performance to achieve desired temperature settings within specified times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If communicating thermostats and HVAC equipment are used to provide advanced control capabilities, then control flexibility and automation are improved, but system cost increases and interoperability with legacy equipment deteriorates
Solution Approach 1:
The controller is designed to perform multiple functions by supporting both communicating protocols (WiFi, Bluetooth, Zigbee) and legacy control methods (24VAC on/off signals). This universal design allows the system to work with diverse equipment types including smart thermostats, traditional thermostats, and legacy HVAC equipment, resolving the contradiction between advanced control capabilities and interoperability.
Solution Approach 2:
The controller acts as an intermediary device that bridges communicating and non-communicating equipment. It can receive commands from smart devices via wireless protocols and translate them into legacy-compatible signals, or vice versa, enabling seamless integration of mixed equipment types without requiring complete system replacement.
2Extent of automation
If communicating systems are implemented to enable automatic identification and control, then system intelligence is improved, but equipment cost and complexity increase
Solution Approach 1:
The system architecture segments intelligence across multiple components: the controller handles complex communication and control logic, while individual HVAC equipment units can operate independently with basic on/off control. This segmentation allows the system to provide smart functionality where needed without requiring every component to be expensive communicating equipment.
Solution Approach 2:
The controller automatically performs device discovery, capability detection, and control plan generation without requiring manual configuration. It self-adapts to the connected equipment type and adjusts its behavior accordingly, reducing the need for complex user setup procedures and specialized installation services.
3Adaptability or versatility
If legacy equipment is supported to maintain consumer choice and retrofitting options, then system accessibility is improved, but control precision and automation capabilities deteriorate
Solution Approach 1:
The controller continuously monitors HVAC equipment performance and building conditions, using this feedback to dynamically adjust control strategies. For legacy equipment, it can implement predictive control algorithms that compensate for the lack of native smart capabilities, maintaining control precision through iterative optimization based on observed system behavior.
Solution Approach 2:
The controller pre-generates control plans based on predicted heating or cooling requirements and schedules them in advance. This allows legacy equipment to be operated with higher precision by providing pre-calculated optimal control sequences, rather than relying solely on simple on/off responses to temperature deviations.
Data Source
AI summary
A system and method for controlling the air temperature in a building. The system includes one or more equipment of a heating ventilation and air-conditioning (HVAC) system, at least one of one or more thermostats or one or more temperature sensors, and a controller. The controller includes a communication module to exchange data with one or more devices and an equipment interface configured to communicate control signals to the one or more equipment. The controller is configured to obtain as user input a target rate of change (ROC) of air temperature in the building and operate the one or more equipment of the HVAC system to achieve the target ROC. The controller operates the one or more equipment at an initial capacity and adjusts the capacity of the one or more equipment to achieve the target ROC of the air temperature in the building.