Structure cooling method

Abstract

The present invention provides a high-efficient method for cooling a structure by spraying water. An air/water mixture ( 31 ) including microbubbles each having a diameter of 75 μm or less is generated by an air/water mixture generating unit ( 29 ) mounted in a part extending from a water supply source ( 2 a ) to a water spray port ( 7, 30, 49 ), the water spray port ( 7, 30, 49 ), or in a water tank ( 14 ). By spraying the generated air/water mixture ( 31 ) from the water spray port ( 7, 30, 49 ), a target surface such as a roof ( 24 a ) of a structure ( 24 ) is covered with the air/water mixture ( 31 ), and the target surface is cooled by heat of evaporation of water.

1 . A method for cooling a structure by using heat of evaporation of water, wherein an air/water mixture ( 5 ,  31 ) including 300 pieces/mL or more of micro air bubbles each having a diameter of 75 μm or less on generation is sprayed on a target surface of a structure. 
   
   
       2 . The method for cooling a structure according to  claim 1 , wherein a water-retention/water-spread layer having a continuous capillary structure including a surface opening and an average hole diameter of 75 μm to 3 mm, and having a thickness of 10 mm or less is made to exist on the target surface, and the air/water mixture ( 5 ,  31 ) is intermittently supplied. 
   
   
       3 . The method for cooling a structure according to  claim 2 , wherein the target surface on which the water-retention/water-spread layer having the capillary structure is made to exist is a surface structure with projections and depressions having a level difference of 1 mm to 300 mm. 
   
   
       4 . The method for cooling a structure according to any one of  claims 1  to  3 , wherein a unit ( 29 ) for generating the air/water mixture ( 5 ,  31 ) is mounted in some midpoint of a part extending from a water supply source ( 2   a ) to a water spray port ( 7 ,  30 ,  49 ) provided near the target surface. 
   
   
       5 . The method for cooling a structure according to any one of  claims 1  to  3 , wherein a unit ( 29 ) for generating the air/water mixture ( 5 ,  31 ) is mounted in a water spray port ( 5 ,  30 ,  49 ) part provided near the target surface, in a part extending from a water supply source ( 2   a ) to the water spray port ( 5 ,  30 ,  49 ). 
   
   
       6 . The method for cooling a structure according to any one of  claims 1  to  3 , wherein a water tank ( 14 ) is provided and the air/water mixture ( 5 ,  31 ) generated in a part of the water tank ( 14 ) is used.