Space heating demand of buildings is a significant component of global energy consumption. Lowering the operating temperatures can increase the overall energetic and exergetic efficiencies. To obtain a lower return water temperature, researchers have proposed a variety of approaches. Absorption heat exchanger is an effective way to reduce return water temperature. However, in two-stage absorption heat exchanger and compression-absorption heat exchanger, extra temperature difference exists in evaporator of absorption heat pump. To eliminate the extra temperature difference, optimized compression-absorption heat exchanger is put forward in the article. Based on the typical case, the energy saving rate of optimized compression-absorption heat exchanger can reach 17.9 %, and the principle of energy saving is analyzed in the article, the key point is the extra temperature difference and the cooling capacity of evaporator of absorption heat pump. Further, the energy savings of the optimized heat changer in different supply and return temperature of primary and secondary network is analyzed. Main factors affecting the energy saving rate are primary network supply temperature and secondary network supply-return temperature difference. As the result, when primary network supply temperature is 130 °C and secondary network supply and return temperature is 50 °C and 40 °C, energy saving rate can reach 28.4 %.

中文翻译：

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两级压缩吸收式换热器配置优化

建筑物的供暖需求是全球能源消耗的重要组成部分。降低工作温度可以提高整体能量和能量效率。为了获得较低的回水温度，研究人员提出了多种方法。吸收式换热器是降低回水温度的有效途径。然而，在两级吸收式换热器和压缩吸收式换热器中，吸收式热泵的蒸发器存在额外的温差。为了消除额外的温差，本文提出了优化的压缩吸收式换热器。基于典型案例，优化后的压缩吸收式换热器节能率可达17.9%，文章分析了节能原理，重点是吸收式蒸发器的额外温差和制冷量热泵。进一步分析了优化后的换热器在不同供回水温度下的节能效果。影响节能率的主要因素是一次网供电温度和二次网供回温差。结果表明，当一次网供电温度为130℃，二次网供回水温度为50℃和40℃时，节能率可达28.4%。