本文選題：集中供熱 + 吸收式換熱　； 參考：《科學通報》2015年31期

【摘要】：吸收式換熱器是吸收式熱泵應用于集中供熱的關鍵核心部件.采用多段吸收式熱泵機構可以有效提升機組性能:一次網回水溫度一定時可大幅降低總傳熱面積,更重要的是在機組面積不變情況下顯著降低一次網回水溫度,實現單段機組無法實現的參數.本文在此技術基礎上,設計并制作了三段大溫差立式降膜吸收-蒸發(fā)器單元,并進行了多組工況的實驗,測試其性能.該實驗單元可以實現水側大溫差,形成三級蒸發(fā)壓力梯度,與傳統(tǒng)單段吸收機相比,實現了梯級換熱,換熱過程更加匹配;建立一維吸收器傳熱傳質模型,分析并解釋了實驗中吸收器出現的冷卻水出口溫度高于溶液溫度的現象.實驗單元直接應用于實際供熱工程中,在不同供暖工況下取得了良好的效果,一次網回水溫度可以低至30℃以下.
[Abstract]:Absorption heat exchanger is the key component of absorption heat pump used in central heating. The multi-stage absorption heat pump mechanism can effectively improve the performance of the unit: the total heat transfer area can be greatly reduced when the backwater temperature of the primary net is fixed, and more importantly, the backwater temperature of the primary net can be significantly reduced when the unit area is constant. The parameters that can not be realized by single stage unit are realized. Based on this technique, a three-stage vertical falling film absorption-evaporator unit with large temperature difference is designed and fabricated. The experimental unit can realize the large temperature difference on the water side and form the three-stage evaporation pressure gradient. Compared with the traditional single-stage absorber, the cascade heat transfer is realized, and the heat and mass transfer model of the one-dimensional absorber is established. The phenomenon that the outlet temperature of cooling water in the absorber is higher than the solution temperature is analyzed and explained. The experimental unit is directly applied to the actual heating engineering, and good results have been obtained under different heating conditions. The backwater temperature of the primary grid can be as low as 30 鈩，

本文編號：2101001