Air conditioning system, air conditioning method, and control device
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Solution Overview
Problem
Existing air conditioning systems for large-scale facilities have limited flexibility in selecting air handling devices, as specifications are often constrained to provide heat exchange performance equivalent to indoor devices, reducing the degree of freedom in device selection.
Innovation Solution
An air conditioning system with an outdoor device, an air handling device, and a control section that adjusts the rotation speed of the air supply fan and/or the degree of opening of the expansion valve based on temperature detection values from both ends of the second heat exchanger and air temperature, forming a refrigerant circuit in an annular shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the specifications of the air handling device are constrained to provide heat exchange performance equivalent to indoor devices, then the reliability of the refrigeration cycle is improved, but the degree of freedom in selecting air handling devices is reduced
Solution Approach 1:
The patent implements dynamic control of the air supply fan rotation speed and expansion valve opening degree based on real-time temperature detection values from multiple sensors. This dynamic adjustment allows the system to adapt to different air handling device specifications and heat exchange performances, enabling a broader range of device selections while maintaining reliable refrigeration cycle operation through continuous optimization of system parameters
Solution Approach 2:
The control section changes operational parameters (fan rotation speed and expansion valve opening degree) based on detected temperature values to compensate for variations in heat exchange performance across different air handling device specifications. This parameter adjustment mechanism allows the system to maintain stable refrigeration cycle operation regardless of the specific air handling device selected, thereby increasing selection freedom while preserving reliability
2Productivity
If the air supply fan rotation speed and expansion valve opening degree are dynamically adjusted based on temperature detection values, then the air conditioning capacity is improved, but the device complexity is increased
Solution Approach 1:
The system employs feedback control by continuously detecting temperature values at multiple points (refrigerant temperatures at both ends of the second heat exchanger, air temperature toward the heat exchanger, and heat-exchanged air temperature) and using these values to automatically adjust the air supply fan rotation speed and expansion valve opening degree. This feedback mechanism optimizes air conditioning capacity while keeping the control logic relatively simple and straightforward
Solution Approach 2:
The control section automatically adjusts system parameters based on temperature detection values without requiring complex external control systems. The system serves itself by using its own sensor data to make real-time adjustments to fan speed and valve opening, thereby improving air conditioning capacity through autonomous operation rather than complex centralized control
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 configuration allows for a high degree of freedom in selecting air handling devices, ensuring proper air conditioning capacity and reliability by dynamically adjusting fan speed and expansion valve opening, thereby reducing costs and enhancing system flexibility.
Implementation Method 1
an outdoor device including at least a compressor (11) and a first heat exchanger (13)
Implementation Method 2
a first heat exchanger (13) . . . a second heat exchanger (32)
Implementation Method 3
an expansion valve (41)
Data Source
AI summary
An air conditioning system provided which has: an outdoor device including at least a compressor and a first heat exchanger; an air handling device including an air supply fan and a second heat exchanger; an expansion valve; and a control section, wherein the compressor, the first heat exchanger, the expansion valve, and the second heat exchanger are sequentially connected in an annular shape to form a refrigerant circuit in which refrigerant circulates, and the control section adjusts a rotation speed of the air supply fan and/or a degree of opening of the expansion valve based on information including a temperature detection value of refrigerant on each of one end side and the other end side of the second heat exchanger, a temperature detection value of air toward the second heat exchanger, and a temperature detection value of air heat-exchanged by the second heat exchanger.