Cool Metal Roofing and Energy Star Compliance

    定义凉爽的屋顶

    Cool roofing is defined differently by various performance criteria in codes, standards, and incentive programs. In general, a cool roof is one that has relatively high solar reflectance and high thermal emittance.

    定义凉爽的屋顶
    During the daylight hours, a roof is constantly subjected to solar energy striking its surface. The term “Solar Reflectance” is a measure of the amount of that solar energy that is immediately reflected from the surface. It is not reflected heat, but reflected electromagnetic energy from the sun. Solar reflectance is reported as a decimal (0 – 1.00) or as a percentage (0-100%). The solar energy that is not reflected away from the surface is absorbed into the outer surface of the roof product and is converted into heat. The heat can be removed by convection as air flows over the surface, or by conduction through the roof material into the sheathing below. The energy that is left can also be re-emitted to the night sky in the form of infrared energy. That re-emitted energy is referred to as thermal emittance, which is also expressed as a decimal (0 – 1.00) or as a percentage (0-100%).

    Cool Metal Roofing

    一个很酷的金属屋顶太阳能反射率和高high thermal emittance would have a lower surface temperature as compared to a roof with low reflectance and low emittance. In the case of a cool metal roof, a lower surface temperature translates into less heat gain into the attic space or living space below the roof. The result is a cooler living space and 降低冷却/加热能耗。

    研究表明，凉爽的金属屋顶可以在其冷却能源成本中节省高达20％的建筑物。此外，通过减少发电厂的能量生产，因此降低了生产过程中发射的温室气体。许多金属屋顶系统是符合能源之星，符合代码和标准的其他酷屋顶要求。

    添加“酷”金属屋顶的好处

    There is good news for homeowners that installed an energy efficient metal roof in 2020: the Federal Property Tax Credits incentive for doing so was extended to Dec. 31, 2020.

    为了利用税收抵免，房主必须额外完成美国国税局（＃5695）和屋顶的最大信用额度（与所有其他适用升级结合）高达500美元。对于可能已经安装了合格金属屋顶的房主，这是2018年的合格金属屋顶，但当时没有提交税收抵免，仍有机会通过完成表格来获得追溯的信用。

    如何获得税收抵免：

    1. Confirm that the metal roof you selected meets or exceeds the Energy Star program requirements and has the appropriate pigmented coatings.
    2. 提交税款时填写IRS表格5695。

    beplay苹果版手机免费下载beplay在线下载McElroy金属颜色满足凉爽屋顶的能源星要求

    注意：屋顶产品的能源之星计划将于2022年被美国政府停止。税务信贷的适用产品需要满足或超过能源明星要求，不需要在能源之星注册。

    凉爽的屋顶

    Cool Metal roofing utilizes reflective pigments to reflect the sun's energy away the roof. Cool roofs help reduce energy consumption and also reduce urban heat island effects. Standard industry criteria for cool roofs are:

    • 对于陡坡应用（大于2:12间距）：初始最小太阳能反射率为0.25，3年龄 minimum太阳能反射0.15。
    • For low slope applications (2:12 or less pitch): initial minimum solar reflectance of 0.65 and 3-year aged minimum solar reflectance of 0.50.
    太阳能反射，热发射率和Kynar 500种颜色的SRI值
    颜色 反思 发射率 SRI
    杏仁 - PVDF. .60 .84 70
    灰灰色 - PVDF .39 .84 41.
    秋天 - PVDF .31 .85 35
    骨白 - PVDF .71 .85 86.
    Brandywine - PVDF. .26 .85 24.
    Brite Red - PVDF .42 .84 45.
    Buckskin - PVDF. .38 .86 41.
    Champagne Metallic - PVDF .38 .80 38.
    Charcoal - PVDF .32 .85 32.
    粘土 - PVDF. .32 .86 33.
    Colonial Red - PVDF .33 .85 34.
    铜便士金属 - PVDF .49 .85 55.
    黑暗青铜 - PVDF .26 .84 24.
    Evergreen - PVDF .26 .84 24.
    Galvalume Plus .69 .19 62.
    哈特福德绿色 - PVDF .25 .85 23.
    象牙 - PVDF. .67 .87 81.
    Leadcoat - PVDF .37 .82 38.
    轻石 - PVDF .53 .86 61.
    Mansard Brown - PVDF .30 .85 30.
    哑光黑色 - PVDF .27 .86 26.
    中铜 - PVDF .30 .87 31.
    Patina Green - PVDF .46 .85 51.
    Patrician Bronze - PVDF .27 .86 26.
    Proked eathered Galvalume - PVDF .30 .79 27.
    Regal Blue - PVDF .26 .85 24.
    Regal White - PVDF .68 .86 82.
    罗马蓝 - PVDF .26 .85 24.
    砂岩 - PVDF. .54 .86 63.
    Silver Metallic - PVDF .57 .78 64.
    板岩灰色 - PVDF .43 .85 47.
    萨里米色 - PVDF .40 .86 43.
    Terra Cotta - PVDF .35 .85 36.
    Terratone - PVDF. .33 .86 34.
    Texas Silver Metallic - PVDF .58 .78 66.
    Tudor Brown - PVDF .29 .86 29.
    用于硅氧烷改性聚酯（SMP）颜色的太阳能反射，热膨胀和SRI值
    颜色 反思 发射率 SRI
    阿拉莫白 .64 .86 77.
    Antique Brown .28 .86 27.
    灰灰色 .46 .86 52.
    秋天的红色 .35 .86 37.
    Brandywine. .33 .87 35
    Brite White .66 .87 80
    Charcoal .37 .86 39.
    粘土 .42 .86 46.
    Evergreen .29 .86 29.
    Ivory - Galvalume Substrate .69 .87 84.
    轻石 .56 .86 65.
    曼萨尔布朗 .31 .86 31.
    哑光黑色 .31 .86 31.
    贵族青铜 .30 .87 31.
    Pewter Gray .46 .86 52.
    罗马蓝色 .32 .86 33.
    萨里米色 .46 .87 52.
    Terratone .31 .86 31.
    木材晒黑 .47 .86 53.
    Tudor Brown .33 .86 34.
    梅花颜色 反思 发射率 SRI
    布拉沃红色 .46 .86 52.
    Cipillion White. .67 .86 81.
    Coral Blue .27 .87 27.
    画廊蓝色 .30 .85 30.
    草甸绿色 .28 .85 27.
    使命粘土 .36 .87 39.
    Morocco Red .27 .86 26.
    ranchwood brown .29 .83 27.
    Slate Gray .26 .85 24.
    西班牙瓷砖红色 .35 .86 37.
    MILAN TILE COLOR 反思 发射率 SRI
    Adobe Red. .32 .87 33.
    Blue Slate .32 .89 34.
    Cedar Shake .31 .87 32.
    经典雪松 .26 .87 28.
    Ebony .27 .84 25.
    灰色板岩 .32 .89 34.
    绿色板岩 .32 .89 34.
    遗产绿色 .25 .87 24.
    家stead Brown .25 .83 23.
    Keystone Gray .32 .87 33.
    亚麻布 .51 .88 59.
    庄园灰色 .25 .87 24.
    新的便士 .41 .86 45.
    红色板岩 .32 .89 34.
    Seasoned Cedar Shake .27 .88 27.
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