Heat exchange system, air conditioning apparatus and control method for air conditioning apparatus
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Solution Overview
Problem
In air-cooled heat pump units, the inconsistent demand for refrigerant between the refrigeration and heating cycles leads to inefficient energy use, as excess refrigerant is stored in the accumulator and does not participate in system circulation, causing high pressure and reduced energy efficiency.
Innovation Solution
A heat exchange system with a compressor, four-way valve, first and second heat exchangers, throttle device, fluid reservoir, and valve bodies that allows for dynamic control of refrigerant flow based on detected refrigerant amounts, enabling on-demand access and maintaining appropriate refrigerant levels for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess refrigerant is stored in the accumulator during heating cycle, then high pressure is prevented from rising, but energy efficiency decreases due to reduced refrigerant circulation
Solution Approach 1:
The patent applies dynamics by making the refrigerant storage capacity of the accumulator adjustable through a control system that regulates the connection between the accumulator and the refrigerant circulation system. During heating operations, the control system dynamically adjusts the accumulator's participation in refrigerant circulation based on system conditions, allowing the refrigerant storage capacity to vary rather than being fixed. This resolves the contradiction by enabling the system to optimize between pressure control and energy efficiency in real-time.
Solution Approach 2:
The patent changes the parameter of refrigerant storage capacity from a fixed value to a variable parameter that can be adjusted based on operating conditions. The control system modifies the effective refrigerant storage capacity of the accumulator by controlling the opening/closing of valves or connections during heating operations, thereby adapting the system to different load conditions and optimizing energy efficiency while maintaining pressure control.
2Device complexity
If fixed refrigerant storage capacity in accumulator is maintained, then system simplicity is preserved, but adaptability to different working conditions is reduced
Solution Approach 1:
The patent applies universality by enabling the accumulator to perform multiple functions: it serves as both a fixed refrigerant storage device and a dynamically controllable refrigerant reservoir during heating operations. The control system allows the accumulator to adapt its function based on system needs, making it versatile for different operating conditions without requiring entirely separate components for each function.
Solution Approach 2:
The control system acts as an intermediary between the accumulator and the refrigerant circulation system during heating operations. It mediates the refrigerant flow by controlling valves or connections, enabling the accumulator to participate in refrigerant circulation when needed while maintaining its primary function as a storage device. This intermediary control adds adaptability without significantly increasing structural complexity.
3Loss of energy
If refrigerant amount in heat exchange cycle is increased, then energy efficiency improves, but high pressure may rise causing power increase
Solution Approach 1:
The patent applies feedback by implementing a control system that continuously monitors system conditions (pressure, temperature, load) and adjusts the refrigerant circulation accordingly. During heating operations, the control system receives feedback about system state and dynamically regulates the amount of refrigerant circulating through the heat exchangers, optimizing energy efficiency while preventing excessive pressure buildup that would increase compressor power consumption.
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 dynamically adjusts refrigerant flow to match operational conditions, reducing power consumption and improving energy efficiency by ensuring appropriate refrigerant levels in the heat exchange cycle.
Implementation Method 1
a detection device, being used to detect the refrigerant amount for heat exchange cycle in the heat exchange system
Implementation Method 2
a throttle device, and one end of the throttle device is communicated with another end of the first heat exchanger
Implementation Method 3
a first heat exchanger, and one end of the first heat exchanger is communicated with a third end port of the four-way valve
Data Source
AI summary
The present disclosure provides a heat exchange system, air conditioning apparatus and control method for air conditioning apparatus. The heat exchange system including a compressor; a four-way valve; a first heat exchanger; a throttle device; a second heat exchanger; a fluid reservoir, including a first communication port and a second communication port, and the first communication port is communicated with the suction port, and the second communication port is communicated with one end of the second heat exchanger; a first valve body, being arranged on a flow path between the fluid reservoir and the compressor; a second valve body, being arranged on a flow path between the second communication port of the fluid reservoir and the throttle device; and a detection device, being used to detect the refrigerant amount for heat exchange cycle in the heat exchange system.