Abstract

This study assessed through numerical simulations, the technical feasibility of a solar-powered absorption cooling system for a small-scale application in an office building in three different cities with a tropical climate in Ecuador. The model and simulations were performed using the dynamic transient software TRNSYS and were compared and validated using experimental data obtained from a real-life system with main components: 12 m² vacuum tube solar thermal collector array, a 4.5 kW LiBr/H₂O single-effect absorption chiller, a 6 kW fan coil and a 100 l sensible cold store. The results of the simulation showed a good agreement with the experimental data with a deviation of 8.5%.The validated model was used to undertake a parametric study to determine capacities of systems that will be applicable to three Ecuadorian cities: Guayaquil, Manta and San Cristobal. The system capacity predicted by the model for the Ecuadorian cities has the following components: 24 m² evacuated tube collector field, a 20 kW heat exchanger, a 15 kW single-stage LiBr/H₂O absorption chiller, a 35 kW cooling tower and a cold storage tank of 2 m³. The results showed that the proposed system could meet most of the required cooling load (90% for Guayaquil and San Cristobal, and 71% for Manta, considering a set point of 24°C) of a typical single-story office building with.

中文翻译：

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在三个热带气候城市中的小型太阳能吸收式制冷系统的建模和仿真

摘要

这项研究通过数值模拟评估了太阳能吸收式制冷系统在厄瓜多尔三处热带气候的三个不同城市的办公楼中小型应用的技术可行性。使用动态瞬态软件TRNSYS进行了模型和仿真，并使用从具有以下主要组件的真实系统获得的实验数据进行了比较和验证：12 m ²真空管太阳能集热器阵列，4.5 kW LiBr / H ₂O单效吸收式制冷机，6 kW风机盘管和100 l显存。模拟结果与实验数据吻合良好，偏差为8.5％。使用经过验证的模型进行参数研究，以确定适用于三个厄瓜多尔城市的系统容量：瓜亚基尔，曼塔和圣克里斯托瓦尔。该模型为厄瓜多尔城市预测的系统容量包括以下组成部分：24 m ²真空管集热器场，20 kW热交换器，15 kW单级LiBr / H ₂ O吸收式制冷机，35 kW冷却塔和2 m ³的冷库。结果表明，所建议的系统可以满足典型的单层办公楼的大部分制冷需求（考虑到24°C的设定点，瓜亚基尔和圣克里斯托瓦尔为90％，曼塔为71％）。