Aircraft Air-Conditioning Control With Adaptive Evaporator Circuits
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Solution Overview
Problem
Existing air-conditioning units for aircraft parked on the ground lack adaptability to varying environmental parameters and unique flowrate/pressure curves of different aircraft, leading to inefficient cooling and the need for multiple units tailored to specific aircraft sizes, resulting in high costs and limited adaptability.
Innovation Solution
The air-conditioning unit features a refrigerant exchanger/evaporator with multiple parallel circuits and individual pressure-reducing valves, temperature and pressure sensors to regulate refrigerant flow, and a main fan with adjustable speed to maintain optimal air temperature and pressure, allowing for flexible refrigeration power adjustment and efficient operation across various aircraft sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the refrigeration power is regulated by varying the compressor power, then the temperature regulation is improved, but the adaptability to environmental parameters and enclosure characteristics remains limited due to fixed exchanger/evaporator parameters
Solution Approach 1:
The exchanger/evaporator is divided into multiple independent parallel circuits, each with its own pressure reducing valve. This segmentation allows selective activation of circuits based on the required refrigeration power, enabling fine-grained adaptation to different environmental conditions and enclosure characteristics without being constrained by fixed parameters.
2Adaptability or versatility
If a single air-conditioning unit is designed to serve multiple aircraft sizes, then the capital cost is reduced, but the unit cannot simultaneously satisfy the divergent flow rate/pressure curve requirements of small and large aircraft
Solution Approach 1:
The system dynamically adapts its performance characteristics by selectively activating parallel circuits and adjusting pressure reducing valves based on the specific aircraft's flow rate/pressure curve requirements. This dynamic configuration allows a single unit to serve multiple aircraft sizes effectively, from small business jets to large-capacity aircraft, without manual adjustments.
3Power
If the refrigeration power is increased to meet the demands of large aircraft, then the cooling capacity is improved, but the unit causes overpressure in small aircraft and flexible connection ducts that may damage them
Solution Approach 1:
Instead of always operating at full refrigeration power, the system selectively activates only the necessary number of parallel circuits based on the actual cooling demand. For small aircraft, only a subset of circuits is activated, providing partial action that meets the lower cooling demand without generating excessive pressure that could damage the aircraft or ducts.
4Adaptability or versatility
If multiple air-conditioning units are used to cover different aircraft sizes, then the adaptability is improved, but the capital cost and device complexity increase significantly
Solution Approach 1:
The air-conditioning unit is designed with universal applicability through its multiple parallel circuits with individual pressure reducing valves, allowing a single unit to perform the function of multiple specialized units. The system can be configured to serve small business jets, large-capacity aircraft, or any intermediate size, eliminating the need for multiple dedicated units and reducing capital costs.
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
This solution enables the same air-conditioning unit to effectively cool a range of aircraft sizes without manual adjustments, reducing energy consumption and capital costs by automatically adapting to environmental and aircraft-specific parameters, ensuring efficient and adaptable cooling performance.
Implementation Method 1
the said ambient air passes through an exchanger/evaporator, where it is cooled by evaporating a refrigerant flow circulating in the exchanger/evaporator
Implementation Method 2
an exchanger/evaporator placed in the said air circuit in order to cool the air by evaporating the refrigerant
Implementation Method 3
the said refrigerant is condensed in a condenser downstream of the compressor
Implementation Method 4
a condenser for condensing the refrigerant before it is returned to the exchanger/evaporator
Data Source
AI summary
An air-conditioning unit including an air circuit with an air inlet, a main fan and an air outlet designed to be connected to a chamber, preferably via one or more flexible ducts, and a refrigerant circuit including a heat exchanger/evaporator positioned in the air circuit to cool the air by evaporating the refrigerant, a compressor and a condenser for condensing the refrigerant before it is returned to the heat exchanger/evaporator. The heat exchanger/evaporator includes several parallel circuits each having at least one regulator valve. The air circuit also includes a temperature probe downstream of the heat exchanger/evaporator and connected to a controller which controls the regulator valves to regulate the flow of refrigerant, and a pressure probe at the air outlet and connected to a regulator for regulating the speed and/or the power of the main fan so as not to exceed a maximum raised pressure at air outlet.