# Simulation of a Solar-Assisted Air-Conditioning System Applied to a Remote School
## 1 Introduction  
Renewable energies are an excellent option to provide electrical energy services, cooling, heating, food dehydration, and desalination, among others, in remote places where traditional fuels are not available or are difficult to acquire [1]. Decentralized low-capacity electrical systems installed in consumption centers, also known as microgrids, enable services to be brought to isolated regions where traditional electrification technologies are difficult to access [2] and, based on a combination with renewable energy sources, prevent the continued emission of large quantities of pollutants into the environment. On the other hand, solar energy can be used for the direct production of electrical energy, as well as for heating and/or cooling of spaces or products [3]. If the air conditioning of spaces is required,it can be done using a thermal or electrical source by means of solar collectors or photovoltaic modules, respectively, as well as some source based on fossil fuels. However, thinking of sustainable development of marginalized and isolated communities, traditional fuels must make way for renewable energies, both for reducing pollutants and saving money. Because of this, the cooling and/or air-conditioning systems driven by clean energies attracted attention for their use in isolated communities, giving comfort conditions to the population and increasing their quality of life [4; 5; 6]. Absorption cooling technologies are an attractive option for the climatization of spaces because they can be driven by low-temperature thermal energy [7] without the use of large amounts of electrical energy [8], being able to use solar heating technologies as sources of activation [9]. In addition, they have great technological maturity, economic profitability, and high efficiency [10], as well as a great possibility of energy integration with other technologies to offer other services simultaneously, such as desalination [11]. A large number of studies related to solar-assisted absorption cooling technologies were carried out. [PERSON] et al. [12] conducted an investigation of experimental results and experiences presented in the state of the art of these types of systems, mentioning that it is necessary to have experience in the installation and to keep the design as simple as possible to ensure efficient operation. [PERSON] and [PERSON] [13] mentioned that low performance and high cost are the main disadvantages of sorption technologies; however, given the synchrony of solar radiation with cooling needs, these systems are still attractive when coupled with solar energy; thus, research continues to seek a solution to their technological, economic, and environmental problems. [PERSON] and [PERSON] [14] mentioned that cooling systems coupled with photovoltaic modules consume half of the investment cost compared to cooling systems driven by thermal energy; thus, a large reduction in the cost of solar collectors must be achieved for them to be competitive. [PERSON] and [PERSON] [15] developed an absorption air-conditioning system cooled by air, which works using an ammonia-lithium nitrate mixture. Their experimental results showed that it is possible to cool the absorption system using only air; thus, there is no need for a cooling tower. They achieved a coefficient of performance (COP) in the range of 0.1 to 0.33 with cooling capacities in the order of 0.8 kW to 3.4 KW. However, the effect on electricity consumption due to the motors of the heat sink fans was not mentioned. [PERSON] et al. [16] carried out experimental tests on an air-cooled solar-assisted absorption cooling system applied to residential buildings. They mentioned that, with this type of system, it is possible to save water, as well as reduce maintenance needs and space due to the absence of cooling tower. In addition, they commented that there are still no low-capacity commercial air-cooled absorption chillers, mainly due to the risk of crystallization of the working mix under environmental conditions. [PERSON] et al.