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Cooling towers reject excess heat through evaporative water cooling — a principle used in industry for over 100 years. The review covers construction and operating cycle, four main types by air delivery method, key parameters (approximately 1% evaporation per 7 °C of cooling), and Legionella protection measures, including mandatory drain eliminator replacement per UNE 100030/2017.
The effect of relative humidity on cooling equipment varies fundamentally between evaporative and conventional air-cooled systems. For evaporative coolers, dry air maximizes performance, while conventional condensers are rated primarily on dry-bulb temperature and airflow. Engineers should apply manufacturer-specified rating conditions and correction methods rather than assume a universal humidity effect.
Arctic presents its evaporative cooling range — cooling pads, ducted coolers, and indirect-direct evaporative coolers — as a response to the common practice of sizing industrial cooling for average conditions rather than actual operational loads. The three product types differ in humidity impact, air-volume capacity, and installation complexity, and the company frames selection around three practical questions.
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