## 1 Introduction  
Mechanical vapor compression consumes exorbitant amounts of high-grade energy [1; 2]. The high consumption of nonrenewable energy from fossil fuels, such as gas and oil, is a part of the remarkable deterioration of the planet, resulting in an increased temperature and higher rates of carbon-dioxide emissions (CO\({}_{2}\)) [3; 4; 5]. Refrigeration and air-conditioning in buildings are among the reported highest consumers of energy, accounting for approximately 17% of the world's electricity consumption [6; 7; 8]. In order to reduce electricity consumption of air-conditioning, a solution would be the use of solar energy [9; 10]. In Mexico, more than 70% of the territory has Global Horizontal Irradiation (GHI) values greater than 4.5 kWh/m\({}^{2}\). By taking advantage of this resource, interior comfort conditions will be enhanced with the use of solar-air-conditioning [9]. Solar thermally-driven heating systems work by thermal applications to absorb solar energy [11; 12; 13]. Solar collectors are used in this process to achieve a cooling task; however, usually, an auxiliary heater is needed to provide the required energy. The efficiency of a solar refrigeration system depends on the collector type, solar radiation intensity and the system operating conditions. When refrigeration systems operate at temperatures between 80 \({}^{\circ}\)C and 100 \({}^{\circ}\)C, a single glazed flat plate-type collector with a selective surface is recommended [14]. The vacuum tube [15] and parabolic solar concentrating collector [16] can provide higher thermal efficiencies at higher operating temperatures. The cooling cycles operate by means of absorption, adsorption, Rankine, solar desiccant cooling cycles [17; 18; 19; 20] and the ejector refrigeration system [21]. Desiccant cooling systems are used as isolated or as hybrid systems [22]. Absorption solar refrigeration systems commonly use ammonia-water as working fluids, which require high temperatures in the generator, provided by parabolic cylindrical collectors. Its use is mainly in refrigeration for food preservation and very little for air-conditioning systems. It is confirmed that absorption refrigeration systems that employ vacuum tube solar collectors are more efficient than those that use flat solar collectors [23]. The absorption refrigeration system uses a process of chemical absorption; therefore, its design is complicated. In addition, the high installation cost delays its application in solar cooling systems [24]. Ejection cooling is a system in which the refrigeration effect is produced through a phase change and which is analyzed in this work. In the ejection systems, the compression that the refrigerating fluid must suffer to produce cooling does not take place in a compressor as in the absorption systems. The pressure of the fluid is increased by an exchange of kinetic energy in an ejector. This method of compression does not involve moving parts and therefore does not consume energy. However, the compressor of the ideal vapor-compression refrigerator cycle is a substitute for an ejector and a pump (at least one). Ejector cooling is one of the most promising technologies because of its relative simplicity and low capital cost when compared with other heat-driven refrigeration systems such as vapor absorption [25]. The relatively low cost of the ejector in the air-conditioning system makes it possible to be used in the residential sector, and it can be used as an environmentally-friendly refrigerator operating with a low boiling point [24]. Cooling cycles per ejector are tritthermic; the exchange heat comes from three different temperatures: evaporator, in which the heat is collected from the cold area; generator, which has the hottest temperatures from solar collectors; and condenser, which releases energy to the environment [26]. However, in solar ejector cooling systems, the instability of solar power and the thermal refrigeration cycle requires great complexity to operate and control the complete cycle.