Dual-Circuit Air Conditioning With Frequency-Based Supply Control
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Solution Overview
Problem
Existing air conditioning systems face reduced power savings due to inaccurate load estimation and high computational processing loads, making it difficult to track changes in outdoor temperature, humidity, and internal loads.
Innovation Solution
An air conditioning system with two refrigerant circuits and a ventilating device, where compressor frequencies are controlled to maintain target temperatures, and the set value of the target supply temperature is adjusted based on the operating frequencies of the compressors to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If air conditioning load is continually estimated to determine target capacities, then power consumption can be minimized, but estimation accuracy decreases and computational processing load increases
Solution Approach 1:
The patent extracts the complex load estimation process and replaces it with a simpler frequency-based control method. Instead of continuously estimating air conditioning load through complex computations, the system directly uses compressor operating frequencies to determine target supply temperatures, eliminating the need for inaccurate load estimation while reducing computational burden.
Solution Approach 2:
The system uses the compressor's own operating frequency as a direct indicator for control decisions. The frequency control units and set value control unit leverage the existing frequency data from compressor operation to automatically adjust target supply temperatures, allowing the system to self-regulate without external load estimation inputs.
2Loss of energy
If air conditioning load is continually estimated, then power consumption can be minimized, but computational processing load increases making it difficult to track environmental changes
Solution Approach 1:
The patent removes the complex computational load estimation process from the control system. By extracting this unnecessary complexity and replacing it with direct frequency-based control, the system achieves power optimization without the computational burden of continuous load estimation, enabling easier tracking of outdoor temperature, humidity, and internal load changes.
Solution Approach 2:
The system changes the control parameter from estimated air conditioning load to actual compressor operating frequency. This parameter substitution simplifies the control logic significantly, as frequency is directly measurable and already reflects the actual operating state, eliminating complex computations while maintaining or improving control accuracy.
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
This approach improves power savings in air conditioning systems by optimizing compressor operation and reducing overall power consumption without the need for complex load estimation processes.
Implementation Method 1
high-temperature and high-pressure gas refrigerant compressed by the compressor
Implementation Method 2
exchanges heat with indoor air inside the outdoor heat exchanger
Implementation Method 3
The liquefied refrigerant is depressurized by a pressure-reducing device into a two-phase gas-liquid state
Implementation Method 4
The refrigerant flowing into the indoor heat exchanger exchanges heat with indoor air to absorb the heat from the indoor air
Implementation Method 5
a second compressor, a second outdoor heat exchanger, a second expansion valve, and a heat exchanger for ventilation are connected by pipes
Data Source
AI summary
An air conditioning system according to the present invention changes a target supply temperature based on a magnitude relationship between an operating frequency of a first compressor and a first frequency at which an operating efficiency of the first compressor reaches a maximum, and a magnitude relationship between an operating frequency of a second compressor and a second frequency at which an operating efficiency of the second compressor reaches a maximum.