This work describes transient numerical modeling of a direct air-cooled, single-effect absorption chiller. The model is lumped parametric based on transient mass, momentum, and energy balances, applied to the internal components of the absorption machine. Thermal and mass storage in each one of the components are taken into account in the transient evaluation, and pressure losses in the SHX are evaluated using a pressure drop coefficient. This work aims to improve the available numerical modeling propositions by using embedded available heat and mass transfer empirical correlations, based on previous experiences in falling film absorption. This approach minimizes the need for experimental parameter identification and allows scalability studies. The experimental validation has been organized in three steps: (i) absorber zero-order model, steady-state conditions; (ii) the whole chiller, also in steady-state conditions; (iii) transient conditions. For the steady-state conditions, most results have an agreement within the margin of the uncertainty of the experiments, with a medium discrepancy of 5% in COP and 11% in the cooling capacity. For transient conditions, the comparison of the outlet temperatures of the secondary streams, reveals discrepancies under 0.5 K, except in some fast transient periods, where higher differences are perceived. To perform the numerical simulations is used as an in-house modular object-oriented simulation platform (NEST platform). Finally, the performance of a prototype demonstration 7 kW air-cooled LiBr-H₂O absorption chiller is predicted through a designed test campaign. This model put gives valuable information for the definition of further regulation and control protocols.

这项工作描述了直接风冷，单效吸收式制冷机的瞬态数值模型。该模型是基于瞬态质量，动量和能量平衡的集总参数，应用于吸收机的内部组件。在瞬态评估中考虑了每个组件中的热量和质量存储，并使用压降系数评估了SHX中的压力损失。这项工作的目的是基于以往在降膜吸收方面的经验，通过使用嵌入的可用热和质量传递经验相关性来改进可用的数值建模命题。这种方法最大程度地减少了对实验参数识别的需求，并允许进行可伸缩性研究。实验验证分为三个步骤：（i）吸收器零阶模型，稳态条件；（ii）整个制冷机，也处于稳态条件；（iii）瞬态条件。对于稳态条件，大多数结果在实验不确定性的范围内保持一致，COP的中等差异为5％，制冷能力的差异为11％。对于瞬态条件，二次流出口温度的比较揭示了在0.5 K以下的差异，但在某些快速瞬态周期中，差异较大。为了执行数值模拟，将其用作内部模块化的面向对象的模拟平台（NEST平台）。最后，样机演示了7 kW风冷式LiBr-H的性能 大多数结果在实验不确定性范围内达成了一致，COP的中等差异为5％，制冷量的差异为11％。对于瞬态条件，二次流出口温度的比较揭示了在0.5 K以下的差异，但在某些快速瞬态周期中，差异较大。为了执行数值模拟，将其用作内部模块化的面向对象的模拟平台（NEST平台）。最后，样机演示了7 kW风冷式LiBr-H的性能 大多数结果在实验不确定性范围内达成了一致，COP的中等差异为5％，制冷量的差异为11％。对于瞬态条件，二次流出口温度的比较揭示了在0.5 K以下的差异，但在某些快速瞬态周期中，差异较大。为了执行数值模拟，将其用作内部模块化的面向对象的模拟平台（NEST平台）。最后，样机演示了7 kW风冷式LiBr-H的性能 除了在某些快速瞬态周期中，可以看到更高的差异。为了执行数值模拟，将其用作内部模块化的面向对象的模拟平台（NEST平台）。最后，样机演示了7 kW风冷式LiBr-H的性能 除了在某些快速瞬态周期中，可以看到更高的差异。为了执行数值模拟，将其用作内部模块化的面向对象的模拟平台（NEST平台）。最后，样机演示了7 kW风冷式LiBr-H的性能通过设计测试活动来预测₂ O吸收式制冷机。该模型提供了宝贵的信息，可用于定义进一步的调节和控制协议。