This paper presents a numerical study of heat transfer inside the adsorber-collector of a solar adsorption refrigerator using the activated carbon AC35-methanol pair. The objective is to estimate the amount of the heat loss through the adsorber-collector, during the solar heating phase, and to determine the effect of heating time on the thermal efficiency of the system. The numerical results showed that the heating time is the most important factor affecting the amount of energy loss. It has shown that the shorter heating time corresponds to the higher efficiency of the adsorber-collector. In addition, a new optimal coefficient of performance, COP optm, is proposed to determine the number of adsorbers to be added to a machine. This latter is considered for consuming an energy equivalent to that received by the adsorber-collector. These additional adsorbers use a heat transfer fluid, coming from the adsorber-collector, instead of direct heating by solar radiation. An application example is presented using experimental results obtained from the literature. It has shown that the number of the additional adsorbers can reach three adsorbers.

中文翻译：

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吸附集热器加热时间对太阳能吸附制冷机性能的影响

本文对使用活性炭AC35-甲醇对的太阳能吸附式制冷机的吸附器-集热器内部的传热进行了数值研究。目的是估计在太阳加热阶段期间通过吸附器-收集器的热量损失，并确定加热时间对系统热效率的影响。数值结果表明，加热时间是影响能量损失量的最重要因素。已经表明，较短的加热时间对应于吸附器-收集器的较高效率。另外，提出了一种新的最佳性能系数COP optm，以确定要添加到机器中的吸附器的数量。认为后者消耗的能量等于吸附收集器所接收的能量。这些附加的吸收器使用来自吸收器-收集器的传热流体，而不是通过太阳辐射直接加热。利用从文献中获得的实验结果，给出了一个应用实例。已经表明，附加吸附器的数量可以达到三个吸附器。