An air-cooling system (100, 100'), comprising: an evaporator adapted to cool an air passing through the evaporator; a pressure resistant reservoir for storing a liquid and fluidly connected to the evaporator and providing the liquid to the evaporator; and a pressure reducer system fluidly coupled to the evaporator and adapted to create a pressure less than or equal to a saturated vapor pressure of the liquid at an ambient temperature inside the evaporator to facilitate a conversion of at least a portion of the liquid flowing through the evaporator into vapors, the pressure reducer system including: a liquid ejector having: an inlet portion adapted to receive the liquid from the reservoir, a throat portion arranged downstream of the inlet portion and fluidly coupled to the evaporator, an outlet portion extending downstream from the throat portion and defining an outlet port of the liquid ejector; wherein the throat portion is adapted to increase a velocity of the liquid received from the inlet portion, and the outlet portion is configured to increase a pressure inside the liquid ejector to facilitate a condensation of the vapors received from the evaporator, wherein a pipe (158, 160) fluidly connects the outlet port of the ejector to the reservoir; and a pump fluidly connected to the inlet portion of the liquid ejector and the reservoir via a pipe and configured to supply the liquid from the reservoir to the liquid ejector. an evaporator adapted to cool an air passing through the evaporator; a pressure resistant reservoir for storing a liquid and fluidly connected to the evaporator and providing the liquid to the evaporator; and a pressure reducer system fluidly coupled to the evaporator and adapted to create a pressure less than or equal to a saturated vapor pressure of the liquid at an ambient temperature inside the evaporator to facilitate a conversion of at least a portion of the liquid flowing through the evaporator into vapors, the pressure reducer system including: a liquid ejector having: an inlet portion adapted to receive the liquid from the reservoir, a throat portion arranged downstream of the inlet portion and fluidly coupled to the evaporator, an outlet portion extending downstream from the throat portion and defining an outlet port of the liquid ejector; wherein the throat portion is adapted to increase a velocity of the liquid received from the inlet portion, and the outlet portion is configured to increase a pressure inside the liquid ejector to facilitate a condensation of the vapors received from the evaporator, wherein a pipe (158, 160) fluidly connects the outlet port of the ejector to the reservoir; and an inlet portion adapted to receive the liquid from the reservoir, a throat portion arranged downstream of the inlet portion and fluidly coupled to the evaporator, an outlet portion extending downstream from the throat portion and defining an outlet port of the liquid ejector; wherein the throat portion is adapted to increase a velocity of the liquid received from the inlet portion, and the outlet portion is configured to increase a pressure inside the liquid ejector to facilitate a condensation of the vapors received from the evaporator, wherein a pipe (158, 160) fluidly connects the outlet port of the ejector to the reservoir; and a pump fluidly connected to the inlet portion of the liquid ejector and the reservoir via a pipe and configured to supply the liquid from the reservoir to the liquid ejector.