| 摘要 |
<p>The thermal efficiency of a boiler is increased by actively causing condensation of water vapour in the flame gas and transferring the latent heat of condensation to water being fed to the boiler. A heat pump system incorporating an evaporator (32) and a condensor (30) is used to provide a controllable heat sink which causes the active condensation. The condensor (30) is preferably included in a heat exchanger (20) so that the water being fed to the boiler is heat by both the flame gases from the boiler and by the condensor.</p> |
