1.1 本规程涵盖了一种测试方法，用于评估平板或聚光集热器中使用的吸收材料，聚光比不超过5，用于太阳能热应用。本规程不用于评估以下吸收性表面:( 1. )用于直接接触或悬浮在传热液体中（即滴流收集器、直接吸收液体等）；( 2. )用于真空收集器；或( 3. )用于无盖板的收集器。 1.2 本规程中包括的试验方法为性能测量试验和老化试验。性能测量测试用于确定吸收材料的各种性能，例如吸收率、发射率和外观。老化试验规定吸收材料暴露在可能导致试样性能变化的环境中。老化试验前后的性能测量提供了一种确定暴露影响的方法。 1.3 假设太阳辐射、高温、温度循环和水分是导致吸收材料降解的主要因素。 描述了试样暴露于这些因素下的老化试验。 注1: 对于某些地理位置，其他因素（如盐雾和灰尘侵蚀）可能很重要。这种做法不评估它们。 1.4 以国际单位制表示的数值应视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1 本规程中的方法旨在通过对吸收性材料进行比较测试来帮助评估长期性能。然而，这些方法的结果尚未显示与实际在役性能相关。 4.2 本规程中的测试方法提供了两种测试方法，符合 图1 . 4.2.1 方法A旨在减少评估所需的时间，使用一系列单独测试来模拟各种暴露条件。 4.2.2 方法B利用模拟热停滞条件下的实际室外暴露的单一测试。 4.2.3 这两种方法的等效性尚未建立。

1.1 This practice covers a testing methodology for evaluating absorptive materials used in flat plate or concentrating collectors, with concentrating ratios not to exceed five, for solar thermal applications. This practice is not intended to be used for the evaluation of absorptive surfaces that are ( 1 ) used in direct contact with, or suspended in, a heat-transfer liquid, (that is, trickle collectors, direct absorption fluids, etc.); ( 2 ) used in evacuated collectors; or ( 3 ) used in collectors without cover plate(s). 1.2 Test methods included in this practice are property measurement tests and aging tests. Property measurement tests provide for the determination of various properties of absorptive materials, for example, absorptance, emittance, and appearance. Aging tests provide for exposure of absorptive materials to environments that may induce changes in the properties of test specimens. Measuring properties before and after an aging test provides a means of determining the effect of the exposure. 1.3 The assumption is made that solar radiation, elevated temperature, temperature cycles, and moisture are the primary factors that cause degradation of absorptive materials. Aging tests are described for exposure of specimens to these factors. Note 1: For some geographic locations, other factors, such as salt spray and dust erosion, may be important. They are not evaluated by this practice. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 4.1 The methods in this practice are intended to aid in the assessment of long-term performance by comparative testing of absorptive materials. The results of the methods, however, have not been shown to correlate to actual in-service performance. 4.2 The testing methodology in this practice provides two testing methods, in accordance with Fig. 1 . 4.2.1 Method A, which aims at decreasing the time required for evaluation, uses a series of individual tests to simulate various exposure conditions. 4.2.2 Method B utilizes a single test of actual outdoor exposure under conditions simulating thermal stagnation. 4.2.3 Equivalency of the two methods has not yet been established.