การประยุกต์ใช้การระเหยของน้ำโดยไม่เพิ่มความชื้นเพื่อลดอุณหภูมิอากาศภายในห้อง / นฎา แสนราษฎร์ = An application of indirect evaporative cooling to reduce room temperature / Nada Sanrat
The main objective of this research is to reduce the air teporature for residentail buildings. Because of the high temperature in Thailand, Energy consumption increases from air-conditioning is quite high. The idea of using indirect evaporative cooling was suggested by this research with considerable from using nature. The methodology of this research consists of : 1) Locating the main influential factors of water evaporation. 2) Establishing an explanatory equation to clarify the relation of the influential factors and enhance the ability to forecast the temperature within experiment. 3) Finding one of more solution to minimize the energy consumption. The temperature reduction experiment was conducted in a testing room that was 30.6 m[superscript 2]. The room was equipped with stainless tube, which has six-inch diameter and 2.34 m[superscript 2] area. Within this room the temperature of the air was reduced by evaporation when flowing through the cooling tube entering the room. The result of this research showed that during the daytime, from 12.00 a.m. to 3.00 p.m., the cooling tube can reduce the indoor temperature as much as 2.5 degree Celsius. During, at this period of time the temperature is high and the relative humidity is low so the effect of cooling ... 1 m/s and no influence from direct sun. This phenomenon to happen. The relationship between these factors can be explained in the predictive formula. The best timing for a water delivery system is releasing 28 degree Celsius water into the cooling tube for 30 minutes then stoping for an hour. This time-baseddelivery has the same result as above. An application of indirect evaporative cooling to reduce room temperature depends on proficient of the evaporation in low relative humidity condition. The conditions must be integrated in to the design of the cooling tube. The cooling tube must be designed to encouraging the heat transfers from the water surface to the air efficiently. The cooling tube must not be rusty. Moreover, the cooling tube's surface areais also important. The effectiveness of the cooling tube will be higher when the surface is larger. The best example is the Bio-Solar House, which can reduce the air temperature more than test tube 4.85 degree Celsius. Its test tube's surface area equal to 7.54 m[superscript 2], which is 3.5 times larger than the experimental test tube. In order to apply this idea for use in actual buildings, the buildings must be "Passive Buildings".
