Direct Expansion AC Feedback Control for Real-Time EER Optimization
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Solution Overview
Problem
Existing air conditioning, refrigeration, and heat pump systems do not effectively adjust operating parameters to maximize energy efficiency ratios (EER) and coefficients of performance (COP) under varying conditions, relying on inference rather than direct measurement and lacking real-time optimization of refrigerant subcooling, superheat, and mass flow rate.
Innovation Solution
A controller system that continuously adjusts operating parameters such as motor speeds, temperature setpoints, and actuator positions based on real-time measurements of EER and COP, using sensors to calculate heat content and power demand, and iteratively optimizing these parameters to achieve maximum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If operating parameters are adjusted to increase cooling or heating capacity, then the capacity is improved, but the energy efficiency ratio deteriorates due to increased power consumption
Solution Approach 1:
The system continuously measures actual EER or COP during operation and uses this feedback to automatically adjust operating parameters. The controller receives real-time efficiency data and modifies compressor speed, fan motor speed, and other parameters to optimize the balance between capacity and power consumption, preventing both excessive capacity (wasting energy) and insufficient capacity (reducing productivity).
Solution Approach 2:
The system dynamically adjusts operating parameters based on real-time conditions rather than using fixed settings. The controller continuously varies compressor speed, evaporator fan speed, and condenser fan speed according to measured EER/COP values and changing environmental conditions, enabling the system to adaptively optimize the capacity-power consumption tradeoff across different operating scenarios.
2Use of energy by moving object
If operating parameters are adjusted to reduce power consumption, then energy efficiency is improved, but cooling or heating capacity deteriorates
Solution Approach 1:
The continuous measurement of EER or COP provides feedback that guides parameter adjustments to maintain adequate capacity while minimizing power consumption. The controller monitors efficiency metrics and adjusts compressor and fan speeds to achieve optimal power usage without compromising the required cooling or heating output.
Solution Approach 2:
The system changes operating parameters such as compressor speed, evaporator fan speed, and condenser fan speed to optimize the balance between power consumption and capacity. By continuously adjusting these parameters based on measured EER/COP values, the system finds the optimal operating point that minimizes energy use while maintaining sufficient cooling or heating capacity.
3Use of energy by moving object
If direct measurement and real-time optimization of EER and COP is implemented, then energy efficiency is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The system implements direct measurement of EER or COP using sensors that monitor temperature, pressure, and power consumption. This feedback is processed by a controller that automatically adjusts operating parameters to optimize energy efficiency. The measurement system includes temperature sensors at key locations, pressure sensors, and power measurement circuits, providing real-time data for continuous optimization.
Solution Approach 2:
The controller acts as an intermediary that processes measurements from multiple sensors (temperature, pressure, power) and translates them into coordinated adjustments of compressor speed, fan speeds, and other operating parameters. This intermediary component integrates the measurement and control functions, managing the complexity of coordinating multiple sensors and actuators while achieving real-time EER/COP optimization.
Data Source
AI summary
Measured EER and COP are affected by the load under which an air conditioning, refrigeration or heating system is running; the load is a function of the evaporating and condensing temperatures. The invention makes adjustments for the purpose of maximizing measured EER and COP in a feedback loop utilized to optimize cooling or heating capacity relative to power consumed. The maximum EER is continuously achieved by incrementally adjusting each operating parameter to realize an incremental increase in EER, even as conditions such as ambient temperature are changing.