This work reports the development of a passive Evaporative Cooling Structure (ECS). Experiments on the scaled down ECS were conducted and its performance in terms of temperature drops was evaluated. Temperature drops of between 5oC and 9oC were recorded. For the conditions of temperature, humidity and wind speeds prevalent in the areas of Kano and Bauchi in Northern Nigeria, the Cooling Loads of the ECS were computed, using the corrected values of Cooling Load Temperature Difference (CLTD). The cooling loads were determined to be a minimum of 55.54 Watts at a Northwest-facing wall and a maximum of 220 Watts at a South-facing wall. The experimental and theoretical values of the CLTD agreed fairly well, with a minimum and maximum differences of about 1 and 4 °C, respectively, for one type of ECS wall and about 3 °C and 6 °C, respectively for one type of ECS roof. The experimental values of CLTD lead the theoretical values in phase of about one hour for the wall but are in phase for the roof.
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