| 摘要 |
<p>A single or multi-stage absorption heat pump operates with a multi-component system and comprises drive section and refrigerating section. The pressure-increasing device in the drive section, opt. also pressure-reducing device in refrigerating section each consist of one or more semi-permeable membranes which permit passage of the refrigerating agent but prevent passage of the absorption agent at least in part. The absorption agent is a multi-component system, in which at least one component has an appreciable vapour pressure and sufficiently small mole size to penetrate the membrane. The second component of this system has a negligible vapour pressure at the operating temp. The semi-permeable membranes are pref. formed as hollow fibre membranes. Pref. materials for the semipermeable membranes are aromatic polyamide and cellulose acetate or cellulose triacetate. Pref. refrigerating agents are methyl amine or a two-component mixt., esp. of ammonia and methylamine. The component having a very low vapour pressure and not penetrating the membrane is pref. lithium nitrate or lithium bromide.</p> |
