| 摘要 |
A heat exchanger 17 comprises a plurality of first fluid channels 21 on the exterior of the heat exchanger 17 having inlets adjacent a longitudinal axis of the heat exchanger 17 and outlets radially spaced from the inlets, a plurality of second fluid channels 23 on the interior of the heat exchanger 17 having outlets adjacent the longitudinal axis of the heat exchanger 17 and inlets radially spaced from the outlets, and the first 21 and second 23 channels sharing a common dividing wall through which heat is exchanged. Channels 21, 23 may curve between the inlets and outlets, may be circular in cross section, may be equispaced around the heat exchanger 17, may be disposed on opposite sides of the heat exchanger 17 and staggered in relation to each other, may diverge as the channels extend away from the longitudinal axis or may be constant in cross section. Channels 21, 23 are formed by a plurality of exterior vanes 19 and interior vanes 18 respectively. Heat exchanger 17 forms part of a heat exchange assembly 1 comprising of a pump assembly (61, fig 3) comprising first and second pumps having concentrically mounted impellers (65, 71, fig 14) for pumping fluids through the channels 21, 23. |
