## 1 Introduction
Moreover, it was demonstrated that the optimum heat source temperature for the LiCl-H\({}_{2}\)O mixture was lower than that for the LiBr-H\({}_{2}\)O mixture. [PERSON] et al. [20] performed a thermodynamic analysis of a single effect absorption cooling system operating with the LiCl-H\({}_{2}\)O and LiBr-H\({}_{2}\)O working pairs. The authors reported that the maximum exergy destruction in the system occurs in the absorber and the generator. Also, the authors reported that the LiCl-H\({}_{2}\)O mixture presented a better performance than the LiBr-H\({}_{2}\)O mixture. [PERSON] et al. [21] theoretically analyzed the performance of a bubble-pump-driven LiCl-H\({}_{2}\)O and LiBr-H\({}_{2}\)O absorption air conditioning systems. The authors reported that, under the same operating conditions, the system operating with the LiCl-H\({}_{2}\)O achieved higher coefficients of performance and cooling capacities than those obtained with the LiBr-H\({}_{2}\)O pair. [PERSON] et al. [22] modelled a double effect absorption cooling system driven by parabolic trough collectors operating with the LiCl-H\({}_{2}\)O and LiBr-H\({}_{2}\)O working pairs. The results showed that when the system operated with the LiCl-H\({}_{2}\)O mixture the solar coefficient of performance was 8% higher than the obtained with the LiBr-H\({}_{2}\)O mixture. [PERSON] and [PERSON] [23; 24] reported two investigations on the energy and exergy performance of a double effect absorption refrigeration system operating with the LiCl-H\({}_{2}\)O and LiBr-H\({}_{2}\)O working pairs. The analysis showed that the system operating with the LiCl-H\({}_{2}\)O achieved higher coefficients of performance and exergy efficiencies than the values obtained by the use of the LiBr-H\({}_{2}\)O working pair. On the other hand, in agreement with the literature reviews presented by [PERSON] and [PERSON] [25] and [PERSON] et al. [26], the use of the alternative working-pair composed of ammonia and lithium nitrate (NH\({}_{3}\)-LiNO\({}_{3}\)) in an ACS, could offer some advantages over the aforementioned mixtures in several aspects. For instance, compared with the ACS using NH\({}_{3}\)-H\({}_{2}\)O, in the systems operating with NH\({}_{3}\)-LiNO\({}_{3}\) is not necessary the use of a rectifier; also, as it was reported by [PERSON] et al. [27; 28] and [PERSON] et al. [29], the NH\({}_{3}\)-LiNO\({}_{3}\) systems are able to operate at lower generation temperatures and higher condensation temperatures reaching higher values for the coefficient of performance at specific conditions. On the other hand, some of the advantages of a system using NH\({}_{3}\)-LiNO\({}_{3}\) over one using H\({}_{2}\)O-LiBr is that the former does not operate in vacuum conditions such as the latter. Furthermore, the NH\({}_{3}\)-LiNO\({}_{3}\) mixture may be used not only for air-conditioning but also for applications requiring temperatures under the 0 \({}^{\circ}\)C, such as food conservation or even freezing, which is one of the main drawbacks associated to the systems operating with the H\({}_{2}\)O-LiBr mixture, since in this systems, the water, acting as refrigerant, freezes in a temperature near to 0 \({}^{\circ}\)C.  
Some of the most relevant studies related to the utilization of NH\({}_{3}\)-LiNO\({}_{3}\) as the working-pair in ACS are the following: [PERSON] et al. [30] proposed an improved absorption cycle for refrigeration applications utilizing a series of absorbers. The condenser and absorber were cooled by a water flow. The authors reported the proposed cycle was able to operate at generation temperatures from 65 \({}^{\circ}\)C and produce refrigeration temperatures as low as \(-\)40 \({}^{\circ}\)C. [PERSON] et al. [31] presented the results of an intermittent solar absorption refrigeration system using a cylindrical parabolic collector as the system generator. The condenser was a helical coil located inside a tank.