Multi-Mode Evaporative Cooling Apparatus for Variable Capacity Control
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Solution Overview
Problem
Existing cooling systems, such as vapor compression systems, are energy-intensive and costly, while evaporative cooling systems face limitations in cooling potential due to wet-bulb depression. There is a need for an improved cooling apparatus with optimized control and operation modes for variable cooling capacity and efficient temperature control.
Innovation Solution
A multi-mode cooling apparatus with a configuration that includes two water reservoirs, a heat rejection unit, and a cooling unit, connected by separate water circuits. This apparatus allows for variable cooling by adjusting the water flow through the circuits, enabling four operational modes: deep-cooling, dry-cooling, adiabatic cooling, and fan mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If vapor compression systems are used for cooling, then cooling capacity is achieved, but energy consumption is high and operational cost is expensive
Solution Approach 1:
The system changes the cooling mechanism from mechanical vapor compression to evaporative cooling by controlling water flow parameters. By adjusting water flow rate and distribution through the evaporative media, the system achieves cooling without high energy consumption, utilizing the phase change of water from liquid to vapor to absorb heat from the air.
Solution Approach 2:
The patent replaces the mechanical vapor compression system with an evaporative cooling system. Instead of using a compressor and refrigerant cycle, the system uses water evaporation through porous media to cool the air, significantly reducing mechanical energy consumption while maintaining cooling capacity.
2Use of energy by moving object
If basic evaporative cooling systems are used, then energy consumption is reduced, but cooling potential is limited by wet-bulb depression
Solution Approach 1:
The evaporative cooling system is divided into multiple stages with separate evaporative media chambers. Each stage provides incremental cooling, allowing the air temperature to be reduced below the wet-bulb temperature limit of a single-stage system. The segmented approach enables progressive heat extraction while maintaining energy efficiency.
Solution Approach 2:
The system dynamically controls water flow distribution across different evaporative media sections to optimize cooling performance. By adjusting water flow rates and distribution patterns, the system can adapt to varying ambient conditions and achieve deeper cooling than static evaporative systems, overcoming wet-bulb depression limitations.
3Temperature
If multi-stage evaporative coolers are used to overcome wet-bulb limitation, then cooling potential is improved, but system complexity increases
Solution Approach 1:
Multiple evaporative cooling stages are merged into a single integrated apparatus with shared water distribution and collection systems. The housing combines multiple evaporative media chambers, water reservoirs, and flow control mechanisms into one unified structure, achieving multi-stage cooling without proportionally increasing system complexity.
Solution Approach 2:
The water circulation system serves multiple functions: it provides cooling water to all evaporative media sections, collects condensed moisture from all stages, and enables flexible operational modes (single-stage or multi-stage cooling). This multi-functionality reduces the need for separate systems for each cooling stage, managing complexity while maintaining enhanced cooling potential.
4Adaptability or versatility
If variable cooling modes are implemented, then adaptability to different cooling requirements is improved, but control complexity increases
Solution Approach 1:
The system incorporates dynamic control mechanisms that allow adjustment of water flow rates and distribution patterns to different evaporative media sections. This enables flexible switching between cooling modes (single-stage, multi-stage, continuous, or intermittent operation) through relatively simple flow control valves and pumps, achieving high adaptability without excessive control complexity.
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 apparatus achieves efficient and variable cooling of air and water by optimizing water flow and circulation, enhancing heat transfer and recycling, and providing multiple operational modes to suit different cooling requirements.
Implementation Method 1
The temperature of dry air can be lowered by utilizing the phase transition of liquid water to water vapor (i.e. evaporation). Evaporative cooling can be described as the addition of water vapor into air which lowers the temperature of the air.
Implementation Method 2
The energy needed to evaporate the water is taken from the air in the form of sensible heat and converted into latent heat while the enthalpy of the air remains constant. This conversion of sensible heat to latent heat is known as an adiabatic process because it occurs at a constant enthalpy.
Implementation Method 3
U.S. Pat. No. 4,361,525 describes an apparatus for efficiently and economically cooling air by sequentially passing the air to be cooled through a chilled water heat exchanger mechanism and then through an evaporative cooler mechanism.
Data Source
AI summary
The invention relates to a multi-component air conditioning apparatus that provides variable cooling capacities. The apparatus can include a main cooling unit and a heat rejection unit. Air can be treated both sensibly and adiabatically. By controlling the flow and volume of water, the apparatus can condition air to variable temperatures. This allows greater variability of capacity and temperature control.