Method and system for compressor modulation in non-communicating mode
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Solution Overview
Problem
HVAC systems with single-speed compressors face inefficiencies in managing varying cooling loads, particularly in situations with high relative humidity, where they often cycle repeatedly between active and de-activated states, leading to ineffective dehumidification and increased energy consumption.
Innovation Solution
The integration of a variable-speed compressor system with a compressor controller and pressure sensor, allowing the HVAC controller to modulate the compressor speed based on cooling and heating loads, ensuring continuous operation at optimal speeds for improved dehumidification and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-speed compressor is used in HVAC systems, then the system structure is simple and cost is reduced, but the system cannot efficiently manage varying cooling loads and experiences repeated cycling in high humidity conditions
Solution Approach 1:
The patent applies the dynamics principle by transitioning from a single-speed compressor to a variable-speed compressor that can dynamically adjust its operating speed based on cooling load requirements and humidity conditions. The compressor controller modulates the compressor speed continuously, allowing the system to adapt to varying thermal conditions without repeated cycling, thereby improving productivity while managing device complexity through electronic control.
2Device complexity
If a single-speed compressor operates in high humidity conditions, then the system structure remains simple, but the system cycles repeatedly between active and de-activated states leading to ineffective dehumidification
Solution Approach 1:
The patent applies the continuity of useful action principle by enabling the compressor to operate continuously at variable speeds rather than cycling on and off. In high humidity conditions, the variable-speed compressor maintains continuous operation at optimized speeds that ensure effective dehumidification, eliminating the repeated cycling problem while maintaining simple control system architecture through the compressor controller.
3Ease of operation
If a single-speed compressor is used, then the system is easier to operate and maintain, but energy consumption increases due to repeated cycling and inability to match varying loads
Solution Approach 1:
The patent applies the parameter changes principle by modifying the operational parameters of the compressor from fixed single-speed operation to variable-speed operation. The compressor controller adjusts the speed parameter dynamically based on cooling load and humidity conditions, allowing the system to match energy input with actual demand. This reduces energy consumption while maintaining ease of operation through automated control, eliminating the need for manual intervention.
4Reliability
If a variable-speed compressor is integrated with a compressor controller and pressure sensor, then dehumidification effectiveness and energy efficiency are improved, but device complexity increases
Solution Approach 1:
The patent applies the feedback principle by incorporating a pressure sensor that provides real-time feedback to the compressor controller about system conditions. The controller uses this feedback information to continuously adjust the compressor speed, optimizing dehumidification performance and energy efficiency. This feedback mechanism enables reliable control while managing device complexity through intelligent algorithm-based decision-making in the compressor controller.
Data Source
AI summary
An HVAC system includes a pressure sensor is disposed in a suction line between a compressor and an indoor heat-exchange coil. The pressure sensor is electrically coupled to a compressor controller. An HVAC controller is electrically coupled to the compressor controller. The HVAC controller is configured to transmit a signal to the compressor controller to activate and de-activate the compressor. The compressor controller is configured to receive a signal from the HVAC controller to activate the compressor, determine a start speed of the compressor, monitor a run time of the compressor, and modulate a speed of the compressor.