| 摘要 |
A heat exchanger (61) suitable for use with a domestic hot water shower comprises a casing (2), and an element assembly (6). Warm waste water from the shower is passed through the casing (2) cavity over the element assembly (6) and acts to warm the flow of primary water which passes through the element assembly (6). A pump may act to increase the velocity of the waste water relative to the element assembly (6) and/or the casing (2), and to prevent the build up or deposition of sludge and/or dirt therein/thereon. The pumping action may be provided by a cleaner (64) comprising one or more rotating areas (8) fitted with flexible fibres (9). Energy extracted from the primary water flow may be used to power the pump/cleaner. A valve may be provided for maintaining the predetermined level of waste water within the casing cavity. <IMAGE> |
