| 摘要 |
An air conditioning system for supplying air to an environment 11 comprises hot pressurised air 12 supplied to and cooled by a primary heat exchanger 15, the cooled air being compressed by one or more compressors 16, 19 and being further cooled in a secondary heat exchanger 20 and then expanded in one or more expansion devices 24, 28. The expanded air is mixed in a mixing device 30 with air recirculated from the environment 11 and the cooled compressed air from secondary heat exchanger 20 can also be supplied to the environment 11 via a bypass path 36. Valves V1, V2, V3 and V4 are provided in a primary flow path 31, a secondary flow path 33 which also communicates with the secondary heat exchanger 20, a flow path 37 from the compressor 16, 19, and a flow path 34 respectively. A bypass valve V6 is also provided in the bypass path 36. An air flow sensor X senses flow to the primary heat exchanger 15 when valve V1 is open, an air flow sensor Y senses flow from the secondary heat exchanger 20 along bypass path 36 when bypass valve V6 is open, and an air flow sensor Z senses flow from the expansion devices 24, 28 to the mixing device 30. A controller controls the valves depending on the flow past sensors X, Y and Z. The environment may be an aircraft cabin. |
