Server Room Air-Conditioning Dehumidification Using Fan Speed Control
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Solution Overview
Problem
Conventional air-conditioning units for server rooms face challenges in dehumidification, as high air flow speeds cause water droplets to be entrained and reach servers, leading to inefficiencies and increased costs, with existing solutions either requiring additional costly components or reducing system performance.
Innovation Solution
Monitoring temperature and humidity levels, adjusting fan speeds to prevent water entrainment during condensation, and using sensors to manage refrigerated water flow, allowing for efficient dehumidification without compromising system performance or adding mechanical parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high air flow speeds are used for effective heat exchange, then cooling performance is improved, but water droplets are entrained and reach servers causing harm
Solution Approach 1:
The patent applies dynamics by making the fan speed adjustable rather than fixed. The system dynamically adapts fan rotation speed based on operating conditions (cooling-only mode vs. dehumidification mode), allowing optimal performance in each scenario while preventing water droplet entrainment when necessary.
Solution Approach 2:
The patent changes the parameter of fan rotation speed based on system state. During cooling-only operation, high fan speeds maintain effective heat exchange. During dehumidification, when condensation occurs on the battery, fan speed is reduced to prevent water droplet entrainment, thus resolving the contradiction between cooling performance and water droplet prevention.
2Object-affected harmful factors
If a droplet separator is installed to capture water droplets, then water droplet entrainment is prevented, but system cost increases and pressure drop occurs reducing efficiency
Solution Approach 1:
The system uses self-service by leveraging the existing fan and control system to prevent water droplet entrainment through speed regulation, rather than adding a separate droplet separator. The control unit monitors conditions and autonomously adjusts fan speed to prevent the harmful effect without requiring additional mechanical separation components.
Solution Approach 2:
The patent replaces the mechanical droplet separator system with a control-based solution. Instead of using a physical separator to capture droplets, the system substitutes a control mechanism that regulates fan speed to prevent droplet entrainment in the first place, thereby reducing device complexity while maintaining effectiveness.
3Object-affected harmful factors
If a pump is installed to recirculate water and prevent condensation, then water droplet entrainment is prevented, but system cost increases and energy consumption increases
Solution Approach 1:
The system uses self-service by utilizing the existing refrigeration cycle and control system to manage condensation. Rather than adding a pump to recirculate water, the system regulates fan speed to control the dehumidification process, preventing water droplet formation issues without requiring additional energy-consuming water recirculation equipment.
Solution Approach 2:
The patent replaces the mechanical pump-based water recirculation system with a control-based fan speed regulation system. This substitution eliminates the need for additional pumps, valves, and ducts, thereby reducing both device complexity and energy consumption while still preventing water droplet entrainment through proper control of the dehumidification process.
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
Enables effective dehumidification in any operating mode without reducing system efficiency, maintaining performance and keeping costs low by using sensors to regulate fan speeds and water flow.
Implementation Method 1
heat exchange means in order to then blow it, treated
Implementation Method 2
condensed water forms on the fins of the battery of the heat exchanger
Data Source
Figure 1~2
AI summary
A method of optimizing the dehumidification function for air-conditioning units for server rooms and the like, comprising the following steps: - monitoring the temperature and humidity of air entering an air-conditioning unit (10), - monitoring the temperature of water entering the air-conditioning unit (10), - if the water temperature is lower than the air temperature, reducing the speed of air outflow fans (13) to a value such as to avoid the entrainment of water formed by condensation on a heat exchanger (11) of the air-conditioning unit (10), - if the temperature and humidity of the air entering the air-conditioning unit (10) are such that the dew point temperature of the air is higher than the water temperature, returning the speed of the fans (13) to the nominal value.