Encapsulated PCM aggregate

• US 4,747,240 A
• Filed: 08/06/1981
• Issued: 05/31/1988
• Est. Priority Date: 08/06/1981
• Status: Expired due to Term

• Current Assignee: National Gypsum Properties LLC
• Original Assignee: National Gypsum Properties LLC
• Inventors: Slyh, John A., Voisinet, Walter E., Daymon, Deall
• Primary Examiner(s): Scherbel, David A.
• Assistant Examiner(s): Chilcot, Jr., Richard E.
• Application Number:
  US06/290,617
• Time in Patent Office: 2,490 Days
• Field of Search: 52/173 R, 52/389, 52/481, 52/415, 52/232, 52/446, 126/400, 165/DIG. 4, 165/104.17, 165/104.21, 252/53, 252/70, 106/90, 106/96
• US Class Current: 52/173.1
• CPC Class Codes: C09K 5/063 Materials absorbing or liberating heat during crystallisation; Heat storage materials
• CPC Class Codes: F28D 20/023 the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
• CPC Class Codes: Y02E 60/14 Thermal energy storage
• CPC Class Codes: Y10S 165/902 Heat storage

Abstract

Phase change materials (PCM'"'"'s) having a phase change at about 10° C. to 30° C. are incorporated like a fine aggregate into building materials.

Claims

1. An inorganic cementitious interior building material comprising primarily inorganic material and including a cementitious ingredient for binding together all of the elements of said building material and, dispersed therewithin, a substantial and up to about 75% by volume portion of small particles of a phase change material having a substantial latent heat of fusion at a temperature in the range of about 10°

C. to 30°

C., said phase change material being in a form which retains its particle integrity during repeated cycles of melting and freezing.

2. A cementitious building material as defined in claim 1 wherein said particles are capsules consisting of a phase change material sealed within a shell.

3. A cementitious building material as defined in claim 2 wherein said capsules are approximately spherical in shape and of a diameter of about 500 to about 3000 microns.

4. A cementitious building material as defined in claim 1 wherein said particles are non-encapsulated phase change materials which have been form stabilized.

5. A cementitious building material as defined in claim 1 wherein said building material is a coating for a building surface.

6. A cementitious building material as defined in claim 1 wherein said building material is a board for forming building walls.

7. A cementitious building material as defined in claim 1 wherein said building material is a tile floor underlay mortar.

8. A cementitious building material as defined in claim 1 wherein said building material is an interior surface forming material suitable for use on substantially all wall and ceiling surfaces and said phase change material has a phase change temperature of about 20°

-22°

C.

13. A building comprising a plurality of rooms for human occupancy, each room being formed by a floor, a ceiling and a plurality of walls, a major portion of said ceilings and walls having a surface formed from a building material as defined in claim 1.

14. A building comprising a plurality of rooms for human occupancy, each room being formed by a floor, a ceiling and a plurality of walls, a major portion of said ceilings and walls having a surface formed from a building material as defined in claim 6.

9. An interior building material comprising an inorganic cementitious binder, filler materials and a substantial and up to about 75% by volume portion of small capsules having sealed therein a phase change material having a substantial latent heat of fusion at a temperature in the range of about 10°

C. to 30°

C.

10. A building material as defined in claim 9 wherein said phase change material is a polyethylene glycol.

11. A building material as defined in claim 9 wherein said phase change material is a low melting paraffin.

12. A building material as defined in claim 9 wherein said phase change material is a hydrated salt of the class consisting of sodium and calcium.