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| Satellite air-conditioning |
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Energy-saving and environmentally-friendly air-conditioning for aircraft parked at satellite sites.
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Air-conditioning system using overnight heat storage to provide optimum air-conditioning for aircraft parked at airport satellite sites.
Aircraft are fitted with an auxiliary power unit (APU), which can be used to supply power and air-conditioning while the aircraft is on the ground. But running the APU creates pollution in the form of exhaust gas in areas surrounding the airport. The airport ground power unit (GPU) supplies power and air-conditioning from the ground instead of the APU, an approach that’s more energy-efficient than APU usage and that uses cleaner energy.
A low-temperature heat storage (LEM) system for aircraft is used to store heat generated using cheap nighttime electricity, which is then released during the daytime. This environmentally-friendly system helps even out power consumption and enables effective energy use.
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Uses a low-temperature heat storage (LEM) system to make effective use of nighttime electricity, reducing costs and evening out power demand.
1. Heat storage
Gas at temperatures below -10°C is supplied to the heat storage tank by the refrigerator unit (R-134a refrigerant). The storage refrigerant inside the heat storage tank is cooled and ice forms on the coil surfaces. The ice has a solidification temperature of -6°C, and the heat exchanged during solidification is stored.
Heat storage is carried out at night to even out power demand and to achieve cost benefits.
2. Heat dissipation
The system is operated during the daytime to air-condition aircraft. Ice at -6°C inside the heat storage tank is melted, and the refrigerant−now at -3.5°C−is fed from the heat storage tank to the air-conditioning heat exchanger. Heat exchange with brine (non-freezing liquid) takes place in the heat exchanger and the brine cooled to -2°C is fed to the air handling unit (AHU).
If the air-conditioning load exceeds the heat dissipation capacity, the refrigerator unit operates as a brine cooler, cooling to -2°C to supplement capacity.
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