## 2 Related Works
In [34], a supervisory control is implemented in a solar air-conditioning plant, where the control goal was to match the cooling demand and, at the same time, minimize the gas heater contribution to the absorption chiller heat input, thus showing the importance of the system models for the robustness of this control. According to [35], a modeling and control strategy for a novel HVAC system is presented in a way that considers temperature, humidity ratio and CO\({}_{2}\) concentration; the HVAC system is Multi-Input Multi-Output (MIMO); thus, a dynamic extension algorithm can be employed, and a feedback linearization technique is applied. A Linear-Quadratic Regulator (LQR) is designed to optimize control performance and to stabilize the proposed HVAC system. All of these works propose control solutions with additional systems that supply energy, mainly with an auxiliary generator. On the other hand, the technique based on eject cooling is not generally considered; in this work, we have presented the advantages of using the ejector for use in air-conditioning systems in residential areas. In this paper, we propose a control model, which according to different parameters such as operation modes set by end users, solar radiation disturbances and optimal conditions of operation of the ejector cooling cycle, sets the reference temperature of storage tank and references in the mass flows of operation for the generator and evaporator, thus optimizing the time of use of air-conditioning operated by the ejector without the need of energy supply by an alternate source. Recent studies on the temperature required for the ejection cooling cycle are mentioned in this work. In [36], the authors report a maximum cooling capacity and COP using a generator temperature of 90 \({}^{\circ}\)C and 92.8 \({}^{\circ}\)C. According to [37], an experimental investigation on ejector cooling at low temperature is realized by obtaining a COP of 0.42 at a generator temperature of 74 \({}^{\circ}\)C, evaporator temperature of 10 \({}^{\circ}\)C and a critical condenser temperature of 29 \({}^{\circ}\)C. A cooling capacity of 1080 W was obtained for an area of 9.2 m\({}^{2}\) of single-glazed selective-type collectors in a horizontal position. In [38], the ejector performance using R141 bre refrigerant with thermal storage for solar air-conditioning is presented. A COP average of 0.265 is given for an area of 10 m\({}^{2}\) of an evacuated solar collector at a generator temperature of 84 \({}^{\circ}\)C, condenser temperature of 28 \({}^{\circ}\)C and evaporator temperature of 8 \({}^{\circ}\)C for a cooling capacity of 3.5 kW. According to [24], a solar ejector cooling system is developed using R141b refrigerant; a COP of 0.5 is obtained experimentally for a single-stage ejector cooling system at a \(T_{g}\) of 90 \({}^{\circ}\)C, \(T_{c}\) of 28 \({}^{\circ}\)C and \(T_{e}\) of 8 \({}^{\circ}\)C, covering a cooling capacity of 10.5 kW for a solar flat-plate collector area of 68 m\({}^{2}\). As presented in [39], an acceptable coefficient of performance is one for which generator temperatures should not fall below 90 \({}^{\circ}\)C, evaporator temperatures below 10 \({}^{\circ}\)C and condenser temperatures be over 35 \({}^{\circ}\)C; the COP was 0.13 for an evacuated tube area of 50 m\({}^{2}\), which can provide a cooling capacity of 3.5 kW; \(T_{e}\) below 10 \({}^{\circ}\)C resulted in poor system performance. In [40], an ejector cooling system using water as a working fluid is not suitable for low evaporator temperatures; the COP ejector decreases rapidly as the \(T_{c}\) increases. The results indicated that both COP and system efficiency increased with generator temperature. According to [41], R141b is used as a working fluid to verify the theoretical results.