## 1 Introduction
This process transforms into the isobaric desorption when the vapor pressure reaches the condenser pressure (point B in Figure 1), and the bed temperature increases, which breaks the Van der Waals forces that bound the adsorbate molecules to the surface of the adsorbent. In consequence, the desorption of adsorbate vapor starts. The bed's heating continues to sustain the endothermic desorption with an opened valve between the bed and the condenser. The desorbed vapor flows into the condenser and condenses there. This stage ends when the adsorbate concentration reaches its minimum level, and the bed gains its maximum temperature (point C in Figure 1). In the next stage (isosteric precooling), both the sorption bed valves are closed, and the bed is cooled, which induces the pressure inside the bed to be reduced to the level of evaporator pressure (point D in Figure 1). In the last stage of the adsorption chiller work cycle, the valve between the sorption bed and the evaporator opens while the cooling continues to reject the exothermic adsorption's heat. This induces an adsorbate vapor to be bound to the adsorbent surface. The evaporator's vaporization process delivers the adsorbent vapor to the bed and gives the cooling effect during stage D-A depicted in Figure 1. The described cycle continues as the periodic change of adsorbent temperature is the driving force of the adsorptive cooling production process. Energy and environment-related issues are the focus of scientific activities aiming to reduce primary energy consumption. An effective way to decrease electricity demand for cooling is to use environmentally benign, thermally powered adsorption cooling and desalination systems capable of utilizing industrial waste heat sources, solar, or geothermal energy utilizing environmentally friendly refrigerants. In comparison to conventional vapor-compression systems the recent interest in adsorption cooling and desalination technology results from the fact the adsorption systems: (1) are powered by renewable or waste heat sources of temperatures as low as 323 K [47], which directly leads to a reduction in CO\({}_{2}\) emissions and pollution [48], (2) are environmentally friendly due to the absence of hazardous and environmentally harmful refrigerants [49], (3) allows producing cooling and desalinated water simultaneously [50], (4) have almost zero electricity consumption [51], (5) have no moving parts resulting in high reliability [52], (6) are quiet due to the absence of compressors and no-vibration [53], (7) are simple control & maintenance [53]. However, the widespread application of adsorption chillers is limited by the shortcomings of adsorption cooling technology due to low coefficient of performance [54], bulkiness [52], intermittent cooling [55], high investment costs [55], exploitation under vacuum conditions [56]. In designing an adsorption bed, one of the many aspects to be considered is the parameters of the sorption capacity of the bed relative to water vapor. In this paper, we aim to investigate the effectiveness of a mixture of silica gels and CNTs for use in adsorption chillers. To do this, we determined the sorption capacity of vapor on silica gel enriched with CNTs, by performing isothermal sorption experiments on silica gel samples with and without CNTs. The structural properties of samples, such as specific surface area, pore volume, and pore size distribution, were analyzed using the low-pressure nitrogen adsorption method and scanning electron microscopy method. Water vapor accumulation and emission studies were carried out by gravimetric method at temperatures of 298 K, 313 K, and 333 K. The results showed that the presence of CNTs causes a decrease in the sorption capacity of silica gels in relation to water vapor. The values of sorption capacity to vapor and the effect of CNT addition are dependent on the temperature of the sorption process. As the process temperature increased, lower sorption capacity values of SG/CNT mixtures were obtained.