一种根据热源温度品位自动调节效能的溴化锂吸收式制冷循环

Analysis of a 0. n-effect LiBr /Water Absorption Refrigeration Cycle

针对一种提出的根据热源温度品位自动调节效能的新型溴化锂一水吸收式制冷循环进行了理论分析，该循环可以平滑调节系统COP和工作范围。循环在单效循环基础上加入一对中压蒸发／吸收器，中压蒸发器的冷量用于冷却进入系统的冷却水。这样降低了吸收器出口稀溶液的浓度，升高了被结晶特性限制的发生温度上限，也降低了循环截止发生温度。通过建立模型直观说明了循环的效率变化以及对循环工作范围的扩大。计算结果表明在32℃和40℃的冷却水温下，新的循环（0．n效循环）可以分别将单效循环发生温度范围扩大2倍和6倍，同时保持0．3—0．75的COP。

A novel type of LiBr/water absorption refrigeration cycle with the self-adjustable effect between 0.5 and 1.0 （0. n） have been proposed and analyzed. A pair of medium pressure evaporator/absorber is added into the single effect cycle to form this novel cycle. Cool- ing water into the cycle is preeooled by this evaporator. Precooling makes the solution concentration out of the absorber weaker, which lifts the highest generation temperature limited by crystallization and drops the generation starting temperature. Calculation is given based on several assumptions. Results show that 0. n-effect cycle has generation temperature ranges twice and six times larger than single effect cy- cle under cooling water temperature of 32℃ and 40℃ respectively. Meanwhile a COP of 0.3 - 0.75 is obtained.