| 摘要 |
A gas fired boiler for a domestic hot water and/or central heating system has a burner 25 (Fig. 1), a static heat exchanger 22 through which water is circulated, and a rotary heat exchanger 12 of which the body is a disc of ceramic material such as is currently used for catalytic conversion in automobile exhaust systems. The rotary heat exchanger recovers heat from the gases passing from the static heat exchanger 22 to the outlet flue 4, and uses this recovered heat for heating the fresh air entering through the air intake 3. A conduit 90 having a controllable valve 91 enables heated fresh air to be supplied for space heating purposes if required, whilst improving the thermal efficiency of the boiler by promoting condensation of water vapor from the combustion gases as they pass through the rotary heat exchanger. |
