VRF Indoor Unit Control for Temperature-Humidity Decoupling
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Solution Overview
Problem
Conventional VRF air conditioning systems face challenges in achieving dual control over temperature and humidity without compromising normal refrigerating and heating performances, leading to inefficiencies and environmental concerns due to long refrigerant flow paths.
Innovation Solution
A VRF air conditioning system with dual control over temperature and humidity is implemented, featuring an outdoor machine and multiple indoor machines equipped with solenoid valves, heat exchangers, and a controller that detects indoor temperature and humidity levels to adjust the operation of indoor throttle valves, solenoid valves, and heat exchangers, allowing for coordinated control to meet user demands without extending the refrigerant flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If indoor machines are divided into two parts through series connection to realize constant-temperature dehumidification, then temperature and humidity control capability is improved, but refrigerant flow path becomes very long which deteriorates system performance and energy efficiency
Solution Approach 1:
The indoor machine is segmented into two parallel parts: a first heat exchanger and a second heat exchanger, with each having independent evaporators and condensers. This segmentation allows the system to achieve temperature and humidity control without requiring a long series connection refrigerant flow path, thus maintaining energy efficiency while providing dual control capability.
Solution Approach 2:
Each indoor machine is designed with multi-functionality, where the first heat exchanger can serve as evaporator or condenser, and the second heat exchanger can also serve as evaporator or condenser. This universal design allows flexible operation modes (heating, cooling, dehumidification) without extending the refrigerant flow path, resolving the contradiction between adaptability and energy efficiency.
2Adaptability or versatility
If indoor machines are divided into two parts through series connection to realize constant-temperature dehumidification, then temperature and humidity control capability is improved, but the refrigerant flow path becomes very long which affects normal operation performance
Solution Approach 1:
The system segments the heat exchangers into two independent units with separate refrigerant circuits. This segmentation allows the refrigerant flow path in each unit to remain compact and efficient, maintaining normal operation performance while enabling temperature and humidity control through coordinated operation of the segmented units.
Solution Approach 2:
The system dynamically switches between different heat exchangers as evaporators or condensers based on operational requirements. This dynamic configuration allows the system to maintain optimal refrigerant flow paths for normal operation while achieving temperature and humidity control when needed, thus preserving reliability.
3Adaptability or versatility
If dual control over temperature and humidity is implemented, then user demand satisfaction is improved, but system complexity increases due to additional valves and heat exchangers
Solution Approach 1:
The system divides the heat exchanger into two separate units (first heat exchanger and second heat exchanger), each with its own evaporator and condenser. This segmentation provides dual control capability through independent refrigerant circuits, avoiding the need for complex additional valves and components that would otherwise be required in a unified system.
Solution Approach 2:
The system merges the functions of multiple heat exchangers into a coordinated dual-unit configuration. By combining the first heat exchanger and second heat exchanger with shared control mechanisms, the system achieves temperature and humidity dual control while minimizing overall structural complexity compared to fully independent systems.
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 effectively maintains consistent refrigerating and heating performances while achieving dual control over temperature and humidity, ensuring energy-saving and environmental friendliness, and prevents room temperature lowering during rapid defrosting, thus enhancing indoor comfort.
Implementation Method 1
a first heat exchanger and a second heat exchanger
Implementation Method 2
a first solenoid valve having a first end connected with a second end of the indoor throttle valve
Data Source
AI summary
The disclosure discloses a variable refrigerant flow (VRF) air conditioning system with dual control over temperature and humidity and a control method thereof, in which the VRF air conditioning system includes multiple indoor machines, an outdoor machine and a controller; the outdoor machine is provided with a first connector and a second connector; each indoor machine includes an indoor throttle valve, a first heat exchanger, a second heat exchanger, a first solenoid valve, a second solenoid valve, a third solenoid valve, a temperature detector and a humidity detector; the controller controls the VRF air conditioning system by controlling the indoor throttle valve, the first solenoid valve, the second solenoid valve and the third solenoid valve in each indoor machine.