Cover

Abstract

A cover for a body, including at least one layer having a low emissivity coefficient for radiation associated with radiative heat loss from the body with wavelengths in a first frequency band.

1 . A cover for a body, including at least one layer having a low emissivity coefficient for radiation associated with radiative heat loss from the body with wavelengths in a first frequency band. 
     
     
         2 . The cover according to  claim 1 , wherein the first frequency band has a minimum wavelength of 2500 nm. 
     
     
         3 . The cover according to either one of the preceding claims, wherein a layer having a low emissivity coefficient for radiation associated with radiative heat loss from the body with wavelengths in the first frequency band is made of a material selected from the group consisting of: PVC, EVA co-polymers and appropriate compositions of PE. 
     
     
         4 . The cover according to either one of  claim 1  or  2 , wherein a layer having a low emissivity coefficient for radiation associated with radiative heat loss from the body with wavelengths in the first frequency band includes a thin film made of a material selected from the group consisting of: metals, metal oxides, PVC, PVF films and other low-emissivity coatings. 
     
     
         5 . The cover according to  claim 4 , wherein the thin film is applied to a base layer made of PE. 
     
     
         6 . The cover according to  claim 1 , wherein the cover has a high transmittance of radiation with wavelengths in a second frequency band. 
     
     
         7 . The cover according to  claim 6 , wherein the second frequency band is 250 nm to 3000 nm. 
     
     
         8 . The cover according to  claim 7 , wherein the second frequency band is 400 nm to 3000 nm. 
     
     
         9 . The cover according to any one of the preceding claims, which includes a plurality of sealed cavities. 
     
     
         10 . The cover according to  claim 9 , wherein the sealed cavities are filled with a gas selected from the list consisting of: air, nitrogen, SF 6 , argon, xenon or krypton. 
     
     
         11 . The cover according to either one of  claim 9  or  10 , including a first layer, a second layer and a third layer, wherein the second layer is configured so that the cover includes a continuous matrix of sealed cavities between the first layer and the third layer. 
     
     
         12 . The cover according to any one of the preceding claims, including at least one layer made of PE. 
     
     
         13 . The cover according to any one of the preceding claims, wherein the body is a body of fluid. 
     
     
         14 . The cover according to  claim 13 , including a fluid-repellent coating. 
     
     
         15 . The cover according to either one of  claim 13  or  14 , wherein the body of fluid is a swimming pool.