Modelling and experimental operation of a "reverse-rectification column" for an absorption heat pump.
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概要
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In a "reverse-rectification system," a volatile liquid (water) is injected into the evaporator placed at the bottom of a packed column. A less-volatile liquid (ethylene glycol) is injected into the head of the column. In the column, vapor and liquid are contacted in countercurrent flow (glycol downfiow, water-vapor upflow). Some heat is evolved by the vapor-liquid absorption, and is extracted through a heat exchanger incorporated in the column.<BR>Three different structures of the system are modelled and compared, by using the Ponchon diagram.<BR>A lab-scale reverse-rectification column with an integrated glycol preheater was constructed and operated under atmospheric pressure.<BR>The measured performance criteria are: the <I>temperature lift</I>, which is the difference between the temperature of the upgraded heat flux extracted from the column and that of the heat flux supplied to the evaporator, and the <I>heal efficiency</I>, which is the ratio of these two heat fluxes.<BR>The temperature lift and the heat efficiency were studied as functions of the flow rates of the liquids injected at the top and the bottom of the system.
- The Society of Chemical Engineers, Japanの論文