Extracting heat from hot flue gas by utilization of condensing technology leads to a significantincrease in boiler efficiency. Conventional systems are often limited by unfavorably high returntemperatures of the heating system which preclude the use of the extensive potential of thesensible and especially latent heat of the flue gas.In this research the integration of an absorption heat pump (AHP) into the heating system of awood chips fired boiler is investigated. This allows cooling of the flue gas down to temperaturesaround 25 °C and serves for upgrading the low grade heat for further utilization in conventionalheating systems. Therefore, increases in fuel utilization rate up to 20 % can be achieved.The concept of the heat pump cycle for integration with the biomass boiler is presented, followedby thermodynamic modelling and thermal design of a flue gas-coupled evaporator of the heatpump.
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