This paper analyses a new indirect evaporative cooling system characterized by low energy demand for use in summer conditions. The process is carried out by means of a membrane contactor (MC) equipped with a hydrophobic membrane that is permeable to vapour but not to the liquid phase. Chilled water feeds a radiant ceiling panel in order to reduce the mean radiant and indoor air temperatures in the environment served and, consequently, the energy required by a heat pump working to achieve comfortable conditions. The energy needed by this system is compared with the one required by the heat pump alone to get the comfortable conditions. The results yielded by a SIMULINK program in different summer climatic conditions, in the Mediterranean area, show energy savings of 30 ÷ 60 %.
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