The search for efficient and accessible cooling systems has increased worldwide. This study aims to build and evaluate an evaporative cooling system using a water driven ejector, allowing it to be installed in places with plenty of water. The system was investigated varying the flow rate and temperature of the circulating water, temperature of the replacement water, and coefficient of performance. The best vacuum obtained was 8.5 kPa at nominal operating conditions of 4.1 ± 0.1 m3/h and 5 ± 0.5 °C for the circulating water reaching the temperature of 9.7 ± 0.5 °C. The pulse-like disturbance generated by replacing the cooling water at different periods of times did not result in significant affect vacuum destabilization and the temperature rise in the cooling tank. The coefficient of performance of the system at the highest thermal power of 92.27 W was 0.077, which was underestimated due to possible problems related to pump efficiency. The system evaluated under the conditions proposed can be very efficient for cooling fluids at higher temperatures, and it can be complementary to main refrigeration systems.342416421Cavalheiro, D., Schmidt, F.C., Rodrigues, L.G.G., Siga, C., Leitempergher, F., Laurindo, J.B., Processing of perna perna mussels using integrated process of cooking and vacuum cooling (2013) Journal of Food Process Engineering, 36 (2), pp. 192-201. , http://dx.doi.org/10.1111/j.1745-4530.2012.00672.xHuang, B.J., Chang, J.M., Empirical correlation for ejector design (1999) International Journal of Refrigeration, 22 (5), pp. 379-388. , http://dx.doi.org/10.1016/S0140-7007(99)00002-XJain, A., Agrawal, S.K., Pachorkar, P., Exergy analysis of the solar-driven ejector refrigeration system (2012) IOSR Journal of Mechanical and Civil Engineering, 3 (3), pp. 30-36. , http://dx.doi.org/10.9790/1684-0333036Jeong, H.M., Chung, H.S., Bae, K.Y., Kim, S.H., Shin, Y.S., Water cooling characteristics in an enclosed vacuum tank by water driven ejector (2005) Journal of Mechanical Science and Technology, 19 (1), pp. 164-172. , http://dx.doi.org/10.1007/BF02916115Potter, M.C., Scott, E.P., (2006) Termodinâmica, , São Paulo: ThomsonRodrigues, L.G.G., Cavalheiro, D., Schmidt, F.C., Laurindo, J.B., Integration of cooking and vacuum cooling of carrots in a same vessel (2012) Ciência E Tecnologia De Alimentos, 32 (1), pp. 187-195. , http://dx.doi.org/10.1590/S0101-20612012005000028(2013) Termoacumulação. São Paulo, , http://www.thermoambiental.com.br/termoacumulacao/termoacumulacao.php, Thermoambiental, Retrieved fromVargas, L.C.P., Barbosa, C.R.F., Fontes, F.A.O., Almeida, I.M.G., Projeto do ejetor de um sistema de refrigeração por jato de compressão de vapor (2009) IV Congresso De Pesquisa E Inovação Da Rede Norte E Nordeste De Educação Tecnológica, , Belém