| 摘要 |
An air conditioner comprises a fan 2, a heat exchanger 4 positioned adjacent the fan and suitable for cooling an inlet stream of ambient air 28 to provide an outlet stream of cooled air 30. The heat exchanger comprises at least one cooling tube 8 having a helical construction with a plurality of turns and through which coolant fluid is circulated. The heat exchanger may be positioned upstream or downstream of the fan. The cooling tube may comprise of an inlet 14 and an outlet 16 connected to a source of coolant fluid. The cooling tube may comprise a plurality of aluminium concentric cooling tubes (8k, 8l, fig 9), which may be of a cylindrical or frusto-conical construction. A helical vane (44) located radially between a pair of concentric tubes may guide air through the heat exchanger. An evaporative cooler pad (38) located underneath the tube(s) may capture condensed water dripping from the tube(s) and may be used to humidify the air. The fan may be an axial or centrifugal type. The coolant fluid may be water with antifreeze stored in an insulated compartment and cooled by a refrigeration unit 12. |
