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Roofing Products Containing Phase Change Materials

a technology of phase change materials and roofs, applied in the field of roofs, can solve the problems of reducing the service life of the roof in which they are installed, reducing the effective service life of the roof, and increasing the temperature of the roof shingles, so as to improve the resistance to thermal stresses and attractive appearance

Inactive Publication Date: 2014-11-27
CERTAINTEED CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The PCM-based roofing materials effectively manage thermal stresses by absorbing and releasing heat, reducing surface temperatures and extending the service life of roofing materials while maintaining aesthetic appeal and requiring minimal maintenance.

Problems solved by technology

Depending on the specifics of their installation, roofing products can experience significant thermal shocks on a repeated basis, reducing the service life of the roof in which they are installed.
However, depending on location and climate, roofs, including shingled roofs, can experience very challenging environmental conditions, which tend to reduce the effective service life of such roofs.
One significant environmental stress is the elevated temperature experienced by roofing shingles under sunny, summer conditions, especially roofing shingles coated with dark colored roofing granules.
Furthermore, except in the white or very light colors, there is typically only a very small amount of pigment in the conventional granule's color coating that reflects solar radiation well.
Absorption of solar heat may result in elevated temperatures at the shingle's surroundings, which can contribute to the so-called heat-island effects and increase the cooling load to its surroundings or energy consumption needs for air conditioning.
Although such roofs can be coated with solar reflective paint or coating material, such as a composition containing a significant amount of titanium dioxide pigment, in order to reduce such thermal stresses, this utilitarian approach will often prove to be aesthetically undesirable, especially for residential roofs.
Depending on the environment, such roofs can become soiled rapidly, substantially reducing the reflectivity of the roof.

Method used

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  • Roofing Products Containing Phase Change Materials
  • Roofing Products Containing Phase Change Materials
  • Roofing Products Containing Phase Change Materials

Examples

Experimental program
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Effect test

first embodiment

[0072]Referring now to the figures there is shown in FIG. 1, a schematic illustration of a solar heat responsive roofing material 10 according to the present invention. The solar heat responsive roofing material comprises a flexible thermoplastic polyolefin membrane 12 having finely divided white titanium dioxide pigment particles dispersed therein to provide for solar heat reflectance, reinforced with a polyester scrim 14. The thermoplastic olefin membrane constitutes a continuous phase, in which is dispersed as a discontinuous phase a multitude of elements 16 comprising phase change material 18 having a fusion temperature between 50 degrees C. and 95 degrees C. encapsulated in a flexible elastomeric wall 20. The thermoplastic polyolefin membrane 12 has a thickness of about 0.15 cm, and the average size of the PCM microcapsules 16 is about 0.03 cm.

second embodiment

[0073]FIG. 2 is a schematic illustration of a solar heat responsive roofing material 30 according to the present invention. In this embodiment, a membrane 32 is formed from a pair of continuous bituminous layers 34 sandwiching a reinforcing glass fiber scrim 36. The upper bituminous layer 38 and lower bituminous layer 40 form continuous phase in which is dispersed a discontinuous phase formed from microcapsules 42 comprising phase change material 44 having a fusion temperature between 50 degrees C. and 95 degrees C. encapsulated in a flexible elastomeric wall 46. Partially embedded in the upper surface of the upper bituminous layer 38 are a plurality of roofing granules 50 comprising an inert mineral core 52 coated with a layer 54 of a cured coating composition. The coating composition can include conventional metal oxide pigments, and / or one or more solar reflective pigments, such as titanium dioxide.

third embodiment

[0074]FIG. 3 is a schematic illustration of solar heat responsive roofing material 60 according to the present invention. In this embodiment, a membrane is formed by a pair of bituminous layers 62 reinforced by an embedded reinforcing scrim 64 of glass fibers. The top or upper bituminous layer 66 is surfaced with a plurality of roofing granules 70 formed from an inert mineral core 72 and covered with a layer 74 of a cured coating composition. The coating composition layer 74 includes a continuous coating binder 76 in which are dispersed microcapsules 78 having an exterior wall 80 encapsulating a core 82 of phase change material. The coating composition layer 74 can also include conventional metal oxide colorants as well as, optionally, one or more solar reflective pigments.

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Abstract

A solar heat responsive roofing material includes a continuous phase and dispersed discontinuous phase having a phase transition at a temperature between about 50 degrees Celsius and about 95 degrees Celsius.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of pending U.S. application Ser. No. 11 / 769,530, filed Jun. 27, 2007, which claimed the priority of provisional application Ser. No. 60 / 806,777 filed Jul. 8, 2006.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to roofing products, and processes for making such products.[0004]2. Brief Description of the Prior Art[0005]Roofing products include sheet or roll roofing employed in constructing built-up roofs and mineral-surfaced asphalt shingles. Depending on the specifics of their installation, roofing products can experience significant thermal shocks on a repeated basis, reducing the service life of the roof in which they are installed. For example, a dark colored, south-facing shingled roof installed at a location at a high elevation can experience a significant rise in temperature shortly after sunrise on a cloudless day.[0006]Sheet roofing products ar...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04D1/22E04D1/20E04D13/00
CPCE04D1/22E04D2001/005E04D1/20E04D13/00E04D5/12F28D20/023Y02E70/30Y10T428/24405Y10T428/24372Y10T428/24355Y02E60/14
Inventor HONG, KEITH C.SHIAO, MING LIANG
Owner CERTAINTEED CORP
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