Abstract Absorption heat pump is an effective option for industrial waste heat recovery. However, significant conflict between low evaporation temperature and high efficiency exists in conventional absorption heat pump, which limits its application in deep recovery of low-grade waste heat recovery. To address this issue, this paper presents the use of double-section absorption heat pump for low-grade waste heat recovery. Both theoretical and experimental researches are carried out to analyze the features of double-section LiBr-water absorption heat pump. Driven by hot water with temperature of 120.1 °C, the experimental prototype was able to extract thermal energy from the waste hot water by reducing its temperature from 45.0 °C to 15.9 °C, realizing a large temperature decrease of 29.1 °C for waste hot water. Meanwhile, the experimental prototype could heat water up to 52.5 °C for domestic heating application with capacity of 8666.4 kW and high coefficient of performance of 1.77. The excellent performance is attributed to the stepped generation/evaporation processes with gradient temperatures, which makes the double-section absorption heat pump achieve both higher efficiency for internal circulation and reduced irreversible loss for external circulation comparing with the conventional single-section absorption heat pump. This makes the double-section absorption heat pump an efficient way to realize the deep recovery of low-grade waste heat.

中文翻译：

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用于低品位余热深度回收的双段式吸收式热泵

摘要 吸收式热泵是工业余热回收的有效选择。然而，传统吸收式热泵存在蒸发温度低与效率高的显着矛盾，限制了其在低品位余热回收深度回收中的应用。为了解决这个问题，本文提出了使用双段吸收式热泵进行低品位废热回收。通过理论和实验研究，分析了双节溴化锂吸水热泵的特点。在温度为120.1°C的热水驱动下，实验样机能够将废热水的温度从45.0°C降低到15.9°C，从而从废热水中提取热能，实现废热水降温29.1°C。水。同时，实验样机可将水加热至 52.5°C，用于家庭供暖应用，容量为 8666.4 kW，性能系数高达 1.77。优异的性能归功于温度梯度的阶梯式发生/蒸发过程，使得双段吸收式热泵与传统的单段吸收式热泵相比，既实现了更高的内循环效率，又减少了外循环的不可逆损失。这使得双段式吸收式热泵成为实现低品位余热深度回收的有效途径。优异的性能归功于温度梯度的阶梯式发生/蒸发过程，使得双段吸收式热泵与传统的单段吸收式热泵相比，既实现了更高的内循环效率，又减少了外循环的不可逆损失。这使得双段式吸收式热泵成为实现低品位余热深度回收的有效途径。优异的性能归功于温度梯度的阶梯式发生/蒸发过程，使得双段吸收式热泵与传统的单段吸收式热泵相比，既实现了更高的内循环效率，又减少了外循环的不可逆损失。这使得双段式吸收式热泵成为实现低品位余热深度回收的有效途径。