Air-quantity-regulation system for passenger aircraft

摘要

The system has a fresh-air regulator (4) which is connected to the inlet side of an air-conditioner (5). The regulator is connected to a high-pressure air-distribution network (7) supplying high-pressure hot fresh air. The conditioner outlet is connected to a low-pressure distribution network (8), which it supplies with expanded and cooled fresh air. The inlet of an air-preparation unit (6) is connected to an outlet (9) in the cabin wall so as to extract part of the stale air for recirculation, using a fan (61) blowing mixed air into the cabin (4) for recirculation. All units are electronically controlled by a regulator (1) dependent on control signals and operating data received. A temperature-monitoring unit (2) in the cabin is connected to this regulator and pipe temperature is monitored by a further unit (13) in it near the cabin air inlet (10), also connected to the regulator, a fan-speed signal being also fed to the latter. Signals representing conditioned fresh-air outlet temperature and fresh-air flow rate are also delivered to the regulator, together with others for altitude and number of passengers, and comparison is made with a predetermined cabin temperature. The results are used to regulate fan speed, flow rates and temperatures of air supplied and rate of stale-air extraction.