Design of evaporative-cooling roof for decreasing air temperatures in buildings in the humid tropics

• Main Authors: Kindangen, Jefrey I., Umboh, Markus K.
• Format: Conference Proceeding
• Language: English
• Subjects: Air temperature; Buildings; Ceilings; Cooling rate; Corrugated sheet; Evaporative cooling; Heat; Heat exchangers; Heat transmission; Mass flow rate; Optimization; Overheating; Roofs; Spraying; Thermal comfort; Ventilation; Water installations; Water reuse; Zinc
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.4976887

This subject points to assess the benefits of the evaporative-cooling roof, particularly for buildings with corrugated zinc roofs. In Manado, many buildings have roofed with corrugated zinc sheets; because this material is truly practical, easy and economical application. In general, to achieve thermal comfort in buildings in a humid tropical climate, people applying cross ventilation to cool the air in the room and avoid overheating. Cross ventilation is a very popular path to achieve thermal comfort; yet, at that place are other techniques that allow reducing the problem of excessive high temperature in the room in the constructions. This study emphasizes applications of the evaporative-cooling roof. Spraying water on the surface of the ceiling has been executed on the test cell and the reuse of water after being sprayed and cooled once more by applying a heat exchanger. Initial results indicate a reliable design and successfully meet the target as an effective evaporative-cooling roof technique. Application of water spraying automatic and cooling water installations can work optimally and can be an optimal model for the cooling roof as one of the green technologies. The role of heat exchangers can lower the temperature of the water from spraying the surface of the ceiling, which has become a hot, down an average of 0.77° C. The mass flow rate of the cooling water is approximately 1.106 kg/h and the rate of heat flow is around 515 Watt, depend on the site.