A method of controlling water delivery in an air treatment plant with thermal exchange with process fluids, said treatment plant comprising an air inlet duct from outside said plant, a water absorbing element hit by said air, a water feeding duct for said absorbing element and an economizer device, said method comprising the following steps: - detection by said economizer device of a presence of non-evaporated feeding water (Q R) from absorbing element, (Q R) descending down by force of gravity to said economizer device; - transduction of the presence of non-evaporated feeding water (Q R) by said economizer device into a signal emitted by the economizer device; - delivery of feeding water Q(t) to said water absorbing element in intermittent mode on a predetermined time period t 1 as a function of the characteristics of said adiabatic system, or as a function of the sustainable water delivery limit through the water supply net and the water feeding duct inside the equipment, the regulation device included; - temporary suspension of the delivery of feeding water Q(t) for a time t 2 = y*t 1 following detection of water passage Q R through said economizer, where t 1 is a module > 0 and up to 20 seconds as a function of equipment features, while y is a numeric variable comprised between 1 and 10 according to the equipment features; - resumption of feeding disposable water Q(t) after a time t 3 = Z*t 1 from the end of detecting water passage Q R through the economizer, where t 1 is the above mentioned time module > 0 and up to 20 seconds as a function of equipment features, while Z is another numeric variable comprised between 1 and 10 according to equipment features; - resumption of feeding disposable water at the expiration of a predetermined time t 4 =w 1, where w 1 is a time interval comprised between 1 and 1800 seconds as a function of the equipment features, which is calculated starting from the moment in which said economizer device detects the passage of condensate or other substance not coming from said absorbing element. - detection by said economizer device of a presence of non-evaporated feeding water (Q R) from absorbing element, (Q R) descending down by force of gravity to said economizer device; - transduction of the presence of non-evaporated feeding water (Q R) by said economizer device into a signal emitted by the economizer device; - delivery of feeding water Q(t) to said water absorbing element in intermittent mode on a predetermined time period t 1 as a function of the characteristics of said adiabatic system, or as a function of the sustainable water delivery limit through the water supply net and the water feeding duct inside the equipment, the regulation device included; - temporary suspension of the delivery of feeding water Q(t) for a time t 2 = y*t 1 following detection of water passage Q R through said economizer, where t 1 is a module > 0 and up to 20 seconds as a function of equipment features, while y is a numeric variable comprised between 1 and 10 according to the equipment features; - resumption of feeding disposable water Q(t) after a time t 3 = Z*t 1 from the end of detecting water passage Q R through the economizer, where t 1 is the above mentioned time module > 0 and up to 20 seconds as a function of equipment features, while Z is another numeric variable comprised between 1 and 10 according to equipment features; - resumption of feeding disposable water at the expiration of a predetermined time t 4 =w 1, where w 1 is a time interval comprised between 1 and 1800 seconds as a function of the equipment features, which is calculated starting from the moment in which said economizer device detects the passage of condensate or other substance not coming from said absorbing element.