VRF Air Conditioning Humidity Control Using Segmented Demand Ratios
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Solution Overview
Problem
Existing VRF air conditioning systems struggle to meet the humidity demands of individual indoor units, leading to excessive dehumidification in some rooms and inadequate humidity control in others due to uniform compressor frequency adjustments based on total cooling demand.
Innovation Solution
A method to determine the humidity demand of each indoor unit, adjusting the outdoor fan and compressor speeds based on humidity ratios, and controlling electronic expansion valves to optimize dehumidification capacity according to individual room needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the compressor frequency is increased to meet high cooling demand, then the cooling capacity is improved, but the dehumidification effect is enhanced excessively, causing the room humidity to be lower than user demand
Solution Approach 1:
The system segments the indoor units into two groups: those with humidity demand and those without. By calculating the ratio of humidity demand based on output nominal values, the system applies different control strategies to different segments, allowing the compressor frequency to be adjusted according to the proportion of units requiring dehumidification rather than applying uniform control to all units.
Solution Approach 2:
The system dynamically adjusts the compressor frequency based on the calculated humidity demand ratio. When the ratio exceeds a preset threshold, the compressor frequency is reduced to limit dehumidification capacity. This parameter change allows the system to adapt the dehumidification intensity to match actual user needs while maintaining cooling capacity.
2Measurement precision
If the outdoor fan rotation speed is adjusted to control dehumidification, then the humidity control precision is improved, but the system complexity increases
Solution Approach 1:
The outdoor fan serves multiple functions: it provides both cooling and dehumidification control. By adjusting the fan rotation speed within its operational range, the system achieves humidity control without requiring separate dedicated dehumidification equipment, thereby maintaining system simplicity while improving humidity control precision.
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 adjusts dehumidification capacity to meet the humidity demands of most rooms, improving comfort by ensuring appropriate humidity levels in each room.
Implementation Method 1
adjusting a frequency of a compressor
Implementation Method 2
adjusting a rotation speed of an outdoor fan
Implementation Method 3
the evaporation temperature of each indoor unit is lower
Implementation Method 4
the evaporation temperature of each indoor unit is lower, the dehumidification effect is enhanced
Data Source
AI summary
A variable refrigerant flow (VRF) air conditioning system, a control method thereof, and a computer-readable storage medium are provided. When the VRF air conditioning system is cooling, indoor units in an operating state are obtained. Indoor units with humidity demand and indoor units without humidity demand in the operating state are obtained. A ratio of humidity demand is determined according to an output nominal value of each indoor unit in the operating state. The ratio can include a ratio of a total output nominal value of indoor units with humidity demand to a total output nominal value of indoor units without humidity demand. When the ratio is greater than a preset ratio, a rotation speed of an outdoor fan can be adjusted according to an outdoor environment temperature.