System and method of controlling a variable-capacity compressor
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Solution Overview
Problem
Climate-control systems, such as heat-pump systems, face inefficiencies in energy usage due to fixed compressor capacities, which fail to adapt to varying demand and outdoor temperature conditions effectively.
Innovation Solution
A climate-control system with a variable-capacity compressor and a control module that switches between low-capacity and high-capacity modes based on demand signals, outdoor air temperature data, and compressor runtime, allowing for adaptive operation to optimize energy efficiency and comfort levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fixed-capacity compressor is used, then the system structure is simple, but energy efficiency deteriorates due to inability to adapt to varying demand conditions
Solution Approach 1:
The compressor capacity is made dynamic by implementing variable-capacity operation with multiple capacity levels (first capacity mode and second capacity mode). The control module dynamically switches between these modes based on real-time demand signals and outdoor temperature conditions, allowing the system to adapt to varying cooling loads and improve energy efficiency.
Solution Approach 2:
The compressor operating parameters are changed by varying its capacity output based on environmental conditions. The control module monitors outdoor temperature and demand signals, then adjusts the compressor capacity accordingly - operating in high-capacity mode when temperatures are extreme and in low-capacity mode when milder conditions prevail, optimizing energy consumption across different operating scenarios.
2Productivity
If high-capacity mode is used continuously, then cooling performance is improved, but energy consumption increases
Solution Approach 1:
The system applies partial action by operating the compressor in a first capacity mode that provides sufficient cooling for moderate conditions, rather than continuously running at full second capacity mode. This partial operation reduces energy consumption during periods when maximum cooling capacity is not required, while still meeting the cooling demand effectively.
Solution Approach 2:
The control module implements periodic switching between first and second capacity modes based on cyclical patterns of outdoor temperature and cooling demand. The system transitions between high and low capacity operations in response to periodic environmental variations, optimizing the balance between cooling performance and energy consumption throughout the day and across different weather conditions.
3Use of energy by moving object
If low-capacity mode is used continuously, then energy consumption is reduced, but cooling performance deteriorates during high-demand periods
Solution Approach 1:
The system dynamically adjusts compressor capacity between first and second modes based on real-time monitoring of outdoor temperature and cooling demand. When outdoor temperatures rise above predetermined thresholds or cooling demand increases, the control module transitions from energy-saving first capacity mode to high-performance second capacity mode, ensuring adequate cooling reliability during peak demand periods while maintaining energy efficiency during moderate conditions.
Data Source
AI summary
A climate-control system may include a variable-capacity compressor unit and a control module controlling the compressor unit. The compressor unit may be operable in a first capacity mode and in a second capacity mode that is higher than the first capacity mode. The control module may be configured to switch the compressor unit among a shutdown state, the first capacity mode and the second capacity mode based on a demand signal and outdoor-air-temperature data.