Multi-Compressor Air-Conditioning System for Low-Load Efficiency
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Solution Overview
Problem
Existing air-conditioning systems face challenges with high costs due to complex refrigerant circuits and inefficient operation at low loads, particularly when using multiple compressors, which leads to frequent on/off cycles and reduced compressor lifespan.
Innovation Solution
An air-conditioning system that utilizes a heat pump cycle as a heat source, incorporating multiple outdoor units with variable-frequency compressors and a control system to manage compressor operation and frequency based on load demand, reducing on/off cycles and optimizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple compressors are provided in the refrigerant circuit to reduce on/off cycle operation, then operation efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The system divides the refrigerant circuit into multiple independent heat pump cycles, each with its own compressor. This segmentation allows independent control of each compressor based on load requirements, improving operational efficiency while managing complexity through modular design
Solution Approach 2:
The control system dynamically adjusts the operating frequency of compressors based on real-time load conditions. By continuously monitoring and adjusting compressor speeds, the system optimizes efficiency without requiring excessive compressors, thus balancing performance with complexity
2Loss of energy
If compressor operating frequency is reduced to match low air-conditioning load, then energy saving is improved, but on/off cycle operation increases and reliability decreases
Solution Approach 1:
The control system dynamically adjusts compressor operating frequencies to match load conditions continuously, preventing the compressor from stopping and starting repeatedly. This dynamic speed adjustment maintains reliability by avoiding on/off cycles while optimizing energy consumption during low-load periods
Solution Approach 2:
The system maintains continuous compressor operation at adjusted frequencies rather than allowing on/off cycles. By keeping the compressor running continuously at lower speeds during low-load conditions, the system preserves reliability while achieving energy savings
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a low-cost, high-efficiency air-conditioning solution by minimizing compressor on/off cycles at low loads, extending component lifespan and improving overall operational efficiency.
Implementation Method 1
an air-conditioning system including a plurality of outdoor units (4) and having heat pump cycles (100)
Implementation Method 2
a plurality of compressors (41) provided in the heat pump cycles (100)
Data Source
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AI summary
A low-cost and highly-efficient air-conditioning system including an AHU using refrigerant of a heat pump cycle as a heat source, and capable of reducing an on/off cycle operation of compressors at a time of a low load, the system including: a plurality of outdoor units (4); an air handling unit (2); a plurality of independent heat pump cycles formed by connecting the plurality of outdoor units (4) and the air handling unit (2) by refrigerant pipes (6), each of the plurality of independent heat pump cycles including a compressor (41), an indoor heat exchanger (27), an expansion valve (44), and an outdoor heat exchanger (43); and a number control unit (5b) controlling, to satisfy a capacity demand corresponding to an air-conditioning load, based on a particular frequency range associated with the compressor (41), in which a certain compressor efficiency or more is obtained, a number of the compressors (41) in operation and operating frequencies of the respective compressors (41) in operation.