1.1 本规程涵盖了评估太阳能热应用中平板或浓缩收集器中使用的吸收材料的测试方法，浓缩比不超过5。本规程不用于评估( 1. )直接接触或悬浮在传热液体（即滴流收集器、直接吸收液体等）中；( 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。性能测量试验用于测定吸收材料的各种性能，例如吸收率、发射率和外观。老化试验规定将吸收性材料暴露于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。老化试验描述了试样暴露于这些因素的情况。 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。它们不通过此实践进行评估。 1.4 以国际单位表示的数值应视为标准值。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 本实施规程中的方法旨在通过对吸收性材料进行对比试验来帮助评估长期性能。然而，这些方法的结果并没有显示出与实际运行性能相关。 4.2 本规程中的测试方法提供了两种测试方法 图1 . 图1 测试方法选项概述 4.2.1 方法A旨在减少评估所需的时间，使用一系列单独的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实际室外暴露的单一试验。 4.2.3 这两种方法的等效性尚未确定。

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== 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 . FIG. 1 Outline of Test Method Options 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.