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  • CHAPTER4
    TEST METHODS

    SECTION401
    REQUIREMENTS

    401.1 General.

    Minimum testing requirements for solar collectors shall be in accordance with Sections 401.2 through 401.19.

    401.2 Testing requirements.

    Table 401.2 specifies the tests that shall be conducted on each type of solar collector. An “X” in the table indicates the test shall be conducted. An “O” indicates the test shall be conducted but can be conducted on either collector if two collectors are used to complete testing requirements. The testing sequence is determined by identifying the type of collector, identifying the method of testing to be used, and then following the requirements in Table 401.2 and Sections 401.2.1 and 401.2.2.

    TABLE 401.2

    SOLAR COLLECTOR TEST REQUIREMENTS

    TESTSECTIONLIQUID HEATING COLLECTORSAIR HEATING COLLECTORS
    UNGLAZEDGLAZED (FLAT PLATE, TUBULAR)PROTECTED BY CONTROLS (UNABLE TO WITHSTAND DRY STAGNATION)NONSEPARABLE STORAGE (ICS)CLOSED LOOPTRANSPIRED
    12 Q2 P12 Q2 P12 Q2 P12 Q2 P12 Q2 P12 Q2 P
    Test Specimen Selection401.3XXXXXXXXXXXXXXXXXX
    Baseline Inspection401.4XXXXXXXXXXXXXXXXXX
    High-Temperature Resistance401.5XXXXXXXXXXXX
    Stagnation Temperature401.6XXXXXXXXXX
    Exposure401.7XXXXXXXXXXXX
    External Thermal Shock401.8.1XXXXXXXXXXXX
    Internal Thermal Shock401.8.2XXXXXXXXXX
    Internal Pressure401.9XXXXXXXX
    Leakage401.10XX
    Rupture and Collapse401.11XXXX
    Freeze Resistance (only when freeze tolerance claimed)401.12XXXXXXXX
    Thermal Capacity/Time Constant401.13XXXXXXXXXXXX
    Thermal Performance401.14.1XXXXXXXXXX
    Thermal Performance401.14.2XX
    Incident Angle Modifier401.15XXXXXXXXXX
    Pressure Drop401.16XOOXOOXOOXOO
    Rain Penetration (glazed only)401.17XXXXXXXX
    Mechanical Load401.18XXXXXXXXXXXX
    Impact Resistance302.1XXXXXXXXXXXX
    Final Inspection401.19XXXXXXXXXXXX

    401.2.1 Methods for conducting tests.

    There are two methods for conducting the test. Table 401.2 demonstrates the appropriate requirements for each type of collector and each method as follows:

    1. 1.When all of the tests are conducted on a single collector, the testing requirements for each type of collector are designated with the column heading “1.”

    2. 2.When two collectors are tested, one shall be subjected to the qualification tests, designated in column heading of “2Q,” and the other shall be subjected to the performance tests, designated in column heading of “2P.”

    401.2.2 Testing sequence.

    The test sequence shall follow the order as listed in Table 401.2.

    Exceptions:

    1. 1.The following tests can be conducted in any sequence relative to each other: thermal capacity and time constant, thermal performance, incident angle modifier and pressure drop.

    2. 2.The following tests can be conducted in any sequence relative to each other: high-temperature resistance, exposure, external thermal shock, and internal thermal shock.

    3. 3.All solar collectors containing heat pipes shall be subjected to the exposure test in accordance with Section 401.7 before the thermal performance test is conducted. The same serial-numbered collector shall be subjected to the exposure test and then to the thermal performance test.

    401.3 Test specimen selection.

    Collectors to be tested shall be selected at random in accordance with Sections 401.3.1 through 401.3.2.

    401.3.1 Selection method.

    Random selection of test collectors shall be accomplished through a personal visit by the laboratory, certification body, or authority having jurisdiction or selection from photographs of the collectors in stock. The selected collectors, or collector components, shall be affixed with nonremovable serial-numbered labels.

    401.3.2 Selection process.

    Collectors shall be randomly selected from a group of at least five collectors. Where final assembly of the collector components occurs only at the installation site, each of the components shall be randomly selected from a group of at least five components. The collector’s final assembly geometry shall not change from its design specification.

    Exceptions:

    1. 1.Large collectors greater than 4.6 m2 (50 ft2) shall be randomly selected from a group of at least two collectors where either:

      1. 1.1.Transport in a fully constructed condition is impractical; or

      2. 1.2.Collectors are not inventoried in a fully constructed condition.

    2. 2.If the collector design to be tested is always built for a specific installation, the collector is to be tested in-situ without random selection.

    3. 3.For distributed assembly solar concentrating collectors where the subcomponents are not physically connected to each other, the manufacturer shall specify the geometric parameters and configuration of all subcomponents and the total collector.

      1. 3.1.Parameters shall include orientation, distance, height, and angle of all solar collector subcomponents in relation to each other and the installation site, including the quantity of each.

      2. 3.2.The manufacturer’s specifications shall include minimum and maximum values for each geometric parameter defining the configuration’s final assembly with minimum- and maximum-operating specifications.

      3. 3.3.The configuration(s) to be tested shall fall within these specified ranges, representing operating conditions closest to the minimum and maximum allowed. The most rigorous test conditions applicable shall be used.

    401.4 Baseline inspection.

    The collectors shall be tested as received from the manufacturer when assembled per manufacturer’s documentation. Test specimens shall be inspected prior to testing and any visible damage or assembly flaws shall be recorded. Documentation shall include photographs of the collector or its constituent parts, as received, showing all visible surfaces. Any abnormalities shall be noted and photographed in detail.

    401.4.1 Pre-exposure pressure test.

    It is permissible to conduct the internal pressure test according to Section 401.9 to confirm the flow passages are in a condition suitable for testing.

    401.5 High temperature resistance test.

    A high temperature resistance test shall be performed as specified in Section 9 of ISO 9806.

    401.6 Stagnation temperature.

    The collector stagnation temperature shall be determined as specified in Section 10 of ISO 9806.

    401.7 Exposure test.

    Exposure testing shall be in accordance with Section 11 of ISO 9806, using a minimum of Class B climate conditions, for no less than 30 days of exposure to adverse conditions.

    401.8 Thermal shock tests.

    All collectors shall comply with Sections 401.8.1 through 401.8.7.

    401.8.1 Outdoor testing option.

    When testing is conducted outdoors, each shock shall be performed on a different day.

    401.8.2 Indoor testing option.

    When testing is conducted indoors under a solar simulator, it is permissible to conduct multiple shock tests on the same day provided the collector is allowed to cool to ambient air temperature between shock tests.

    401.8.3 Factory-sealed containers.

    When the solar collector design incorporates one or more factory-sealed containers charged with a refrigerant, other fluid, or phase-change material, these containers shall not be removed for these tests.

    401.8.4 Active mechanisms.

    If the collector assembly has active mechanisms that are intended to be functional during operation, those mechanisms shall be operational during testing.

    401.8.5 Test failure.

    Any test specimen having integrity that is permanently compromised by this test, such that it obviously will not be able to perform, shall be considered to have failed the test.

    401.8.6 External thermal shock/water spray test.

    Two external thermal shock tests shall be performed as specified in ISO 9806, Section 12, using a minimum of Class B conditions.

    401.8.7 Internal thermal shock/cold fill test.

    Two internal thermal shock tests shall be performed as specified in ISO 9806, Section 13, using a minimum of Class B conditions. All parts of the solar collector assembly that are not factory sealed shall be subjected to this test.

    Exception: This test is not applicable to collectors in which heat transfer fluid is continuously flowing for protection purposes. In such cases, control(s) used to manage a no-flow condition shall be validated to be functional in such a way that any failure can be detected. Control functions that have been verified shall be described and reported with the test results.

    401.9 Internal pressure test.

    An internal pressure test shall be performed as specified in ISO 9806, Section 6.

    401.10 Leakage test.

    A leakage test shall be performed on closed loop air heating collectors as specified in ISO 9806, Section 7.

    401.11 Rupture and collapse test.

    A rupture and collapse test shall be performed on air heating collectors as specified in ISO 9806, Section 8.

    401.12 Freeze resistance test.

    A freeze resistance test shall be performed on collectors claimed to be resistant to freezing as specified in ISO 9806, Section 15.

    401.12.1 Freeze resistance test for heat pipes used in solar collectors.

    All heat pipes used in solar collectors shall meet the requirements of Sections 401.12.1.1 through 401.12.1.9.

    401.12.1.1 Purpose.

    This test evaluates the impact of freeze-thaw cycles on heat pipes. The test shall be performed in a controllable climate chamber for the duration of a set number of freeze and thaw cycles (see Table 401.12.1.6). This test shall be performed on heat pipes that are part of the solar collector submitted for testing, regardless of the collector loop design heat transfer fluid.

    401.12.1.2 Selection.

    During the disassembly phase (Section 401.19) of the testing protocol, a minimum of six heat pipes shall be selected to undergo a freeze resistance test. In addition, at least one heat pipe shall be retained as a control sample for comparison with the tested samples. It is permissible to destroy part of the collector (evacuated tubes, collector housing, etc.) to extract the heat pipes. However, when the heat pipes cannot be separated from the evacuated tube without damage to the heat pipe, it is permissible to conduct the test with the evacuated tube in place.

    401.12.1.3 Storage.

    After the heat pipes are extracted from the collector, they shall be kept at a minimum tilt angle of 15 degrees with respect to horizontal, with the condenser at the upper end so that all components of the fluid (inhibitors, particles, etc.) remain in the bottom part of the heat pipe. If the solar collector was stored at less than a 15-degree tilt between the qualification tests and disassembly, the heat pipes must be tilted to at least 15 degrees then raised to and held for 1 hour at what their normal operating temperature would be when exposed to 800 W/m2.

    401.12.1.4 Inspection and measurement.

    A detailed initial inspection of all of the heat pipes shall document the following:

    1. 1.The shape (round, oval, cylindrical, conical, etc.) of all parts of the heat pipe;

    2. 2.The outside dimension of all parts of the heat pipe; and

    3. 3.A photographic record of all test samples.

    401.12.1.5 Temperature sensors.

    Two heat pipes shall have a temperature sensor attached to ensure an accurate and average temperature is measured. Each temperature sensor shall have a maximum standard uncertainty of +/- 1 K and shall be mechanically and thermally attached to the outside of the lower end of a heat pipe near the fluid level when all of the fluid inside the heat pipe is condensed and the heat pipe is held at the tilt specified in Section 401.12.1.3. The temperature indicated by these sensors shall be assumed to represent the temperature of the fluid inside the heat pipe.

    Exception: When the heat pipe cannot be separated from the evacuated tube without damage to the heat pipe, it is permissible to conduct the test with the evacuated tube in place if a temperature sensor is placed inside one of the heat pipes. On one sample, the condenser shall be opened by drilling a hole so that a temperature sensor can be inserted and run to the location where the heat pipe heat transfer fluid rests. The temperature sensor shall have a maximum standard uncertainty of +/-1 K. Every effort shall be made to minimize disruption to the basic structure of the heat pipe, while maximizing the accuracy of temperature measurement at this location.

    401.12.1.6 Test conditions.

    All conditions in Table 401.12.1.6 shall be met.

    TABLE 401.12.1.6

    REQUIRED TEST CONDITIONS

    TEST PARAMETERREQUIRED VALUE
    Tilt angleThe highest of 60 degrees or the manufacturer’s highest recommended tilt angle
    Freezing temperatureNegative 20 +/- 2°C
    Freezing timeThe temperature sensor shall indicate the freezing temperature for at least 30 minutes per cycle
    Thawing temperaturePositive 10 +/- 2°C
    Thawing timeThe temperature sensor shall indicate the thawing temperature for at least 30 minutes per cycle
    Number of cycles20

    401.12.1.7 Intermediate inspection.

    A visual inspection of all heat pipes shall be conducted after the initial five freeze-thaw cycles. If there is a failure, (e.g., fluid leaking or burst pipe) as a result of the freeze-thaw cycling in any of the test samples, the test shall be terminated.

    401.12.1.8 Final inspection.

    A detailed final inspection of all samples shall document the following for each sample tested:

    1. 1.Any permanent change in shape or dimension of all parts of the heat pipe;

    2. 2.Any evidence of fluid leaking from the heat pipe; and

    3. 3.A photographic record of all test samples.

    401.12.1.9 Results.

    The following shall be reported:

    1. 1.The tilt angle of the heat pipes during the test;

    2. 2.All changes to the physical condition of the heat pipes and that of any collector components adjacent to the heat pipe;

    3. 3.The number of temperature cycles that were performed;

    4. 4.The temperature indicated by the temperature sensor(s) during the required dwell periods;

    5. 5.The time the heat pipes were exposed to each dwell period;

    6. 6.Before and after photographs of the tested heat pipes; and

    7. 7.Any deviations from the procedure as defined in Sections 401.12.1.1 through 401.12.1.8.

    401.13 Thermal capacity and time constant test.

    The thermal capacity shall be determined as specified in ISO 9806, Section 26. If the time constant is measured, the test shall be performed as specified in ISO 9806, Section 26.4.

    401.14 Thermal performance test.

    Thermal performance testing of solar thermal collectors shall be performed as specified in Section 401.14.1 or 401.14.2.

    401.14.1 Collectors containing no internal storage.

    The thermal performance test on collectors that do not contain internal storage shall be performed as specified in ISO 9806, Section 20.

    401.14.2 Collectors containing storage.

    Additional testing shall be required for collectors containing storage because the mass of the storage precludes measurement of instantaneous efficiency. Such collectors include both integral collector storage designs and thermosiphon designs where the collection function cannot be separated from the storage function for testing. Such collectors shall be subjected to the applicable tests described in Sections 401.14.2.1 through 401.14.2.2.

    401.14.2.1 General testing procedures.

    Test objects shall be mounted in a manner that is similar to the intended usage. This requirement includes the use of such devices as reflectors and roof support structures. The hydraulic, thermal and optical characteristics shall be reproduced during the test.

    401.14.2.1.1 Testing with fluid other than water.

    Where testing with a fluid other than water, fluid composition tests shall be performed to ensure that the specified fluid composition exists. At a minimum, a hygrometer test or its equivalent shall be performed and checked with the fluid specification before proceeding with the test.

    401.14.2.1.2 Pre-heating heat exchanger.

    In any collector with a heat exchanger containing more than 2.5 percent by volume of the storage vessel volume, the heat exchanger shall be preheated to the same temperature as the rest of the collector for all tests. This heat exchanger shall not be directly purged at the end of the test. The energy within it shall be purged in the normal operating fashion.

    401.14.2.1.3 Manufacturer’s recommended operating conditions.

    Performance testing shall not be performed in excess of manufacturer’s recommended operating conditions. Adjustment of test-operating conditions is permissible to conform to the intent of the test

    401.14.2.1.4 Required instrumentation accuracy and resolution.

    Table 401.14.2.1.4 indicates the required assurances for the instrumentation used in the tests required in Section 401.14.2. The radiation measurements shall be performed with devices that meet the standards of the World Meteorological Organization for a first-class pyranometer or pyrheliometer. The data resolution shall be not lower than the stated accuracy. The test lab shall ensure that data is checked for any offsets immediately prior to and at the conclusion of the test. Offsets shall be applied to the processed data and noted in the test report.

    TABLE 401.14.2.1.4

    INSTRUMENTATION ACCURACIES

    VALUE TO BE MEASUREDACCURACY SI UNITS (±)ACCURACY IP UNITS (±)
    Temperature0.1°C (precision 0.1°C)0.2°F (precision 0.2°F)
    Temperature Difference0.1 K (precision 0.1 K)0.2 R (precision 0.2 R)
    Mass1%1%
    Fossil Fuel Usage1%1%
    Air Flow1%1%
    Liquid Flow1% measured mass value1% measured mass value

    401.14.2.1.5 Minimum data time step.

    Data shall be sampled at a maximum interval of 15 seconds. This data shall be averaged and reported at a maximum rate of 5 minutes for long-term tests having a duration longer than 1 day, or 0.5 minute for short-term tests. Because of the interaction with the transient system simulation software, which uses a fixed time step, data for all collected channels shall be reported in fixed time steps. Note that any test using an energy purge shall be measured with the highest data resolution available at the laboratory.

    401.14.2.1.6 Instrument calibration.

    Calibration of instrumentation used in the testing setup shall be traceable to a national standard and be performed at least annually.

    401.14.2.1.7 Required experimental data.

    The data specified in Sections 401.14.2.1.7.1 through 401.14.2.1.7.3 are required.

    401.14.2.1.7.1 Required numerical data.

    The minimum real time data to be collected for the tests shall consist of the following in metric units. Data channels shall be reported on a regular time interval. Channels not used in a particular test shall be populated with a value not found elsewhere in the data for that channel. The test lab shall review for and address any missing or erroneous data. This data reduction shall occur prior to submission for modeling.

    401.14.2.1.7.1.1 Data gaps or corrections.

    Gaps or corrections for critical data shall not last longer than 10 minutes during non-purge periods. During purge periods, critical data shall not be missing or erroneous. The missing or adjusted data shall be filled in using proxy measurements or interpolation to existing data and highlighted in the data set and noted in the test report.

    401.14.2.1.7.1.2 Log requirements.

    A log indicating the timing of the draw, purge, and irradiation start and stop times shall be included. Other data including site elevation, longitude, latitude, and test sample orientation shall be supplied. Any data sets that do not meet these minimum requirements shall be excluded from the analysis. Required data includes:

    1. 1.Data collection time, both local and solar, and date and day of year (dd-mm-yyyy)

    2. 2.Inlet temperature(s) (°C)

    3. 3.Outlet temperature(s) (°C)

    4. 4.Ambient temperature (i.e., “Outside,” if applicable) (°C)

    5. 5.Environmental temperature (i.e., “Inside,” if applicable) (°C)

    6. 6.Flow rate(s) (kg/hr)

    7. 7.Fluid heat capacities(s) (kJ/kg-°C)

    8. 8.Wind velocity (m/s)

    9. 9.Auxiliary energy usage, if applicable (kJ)

    10. 10.Radiation measurements (kJ/m2)

      1. a.Total surface

      2. b.Total horizontal

      3. c.Horizontal diffuse

      4. d.Horizontal infrared, integral collector storage and unglazed collectors only

    401.14.2.1.7.2 Required physical data.

    Easily accessible significant characteristics of the component or collector shall be measured and reported in consistent sets of units, including:

    1. 1.Diameters, lengths and widths, internal and external.

    2. 2.Lengths, internal and external, and spacing of tubes and fins.

    3. 3.Heights, internal and external, minimum and maximum water levels shall be denoted.

    4. 4.Thickness, such as insulation, tank shell, tank vessel, and fins.

    5. 5.Volumes at ambient air temperature of the tank and any integral heat exchangers.

    6. 6.A diagram indicating geometry including vessel, shell, and any protrusions such as heat exchangers and plumbing connections.

    7. 7.Materials used for vessel, including insulation, shell, tank liner, and heat exchangers.

    8. 8.Piping lengths and orientations.

    9. 9.Slope of components.

    401.14.2.1.7.3 Additional required documentation.

    The following documentation shall be provided:

    1. 1.Equipment model number(s);

    2. 2.Description of the test method(s) and any deviations from the standard method; and

    3. 3.Photographs of any applicable equipment.

    401.14.2.1.8 Laboratory process.

    The testing and analytical work shall consist of these steps:

    1. 1.The test lab shall determine physical parameters from the tests.

    2. 2.The test lab shall collect extended test data from warm up tests.

    3. 3.The test lab shall prepare the data in the format requested by the certification body.

    4. 4.The certification body shall create a model using transient system simulation software.

    401.14.2.1.9 Data processing methods.

    These tests shall provide data for computer modeling of collectors or collector components, or both. The method of modeling shall depend upon the test and available transient system simulation software models. The certification body will provide direction for new and innovative collector tests that are not explicitly covered in this test method.

    401.14.2.1.9.1 Use of real-time data.

    The calculation of temperature-dependent densities and heat capacities shall be performed using real-time data by the test lab. Data reduction shall include the filtering out of any erroneous data. The delivered energy value shall be used where matching net delivered energy with the transient system simulation software. It is permissible to not adjust this value if the simulation software accounts for energy changes caused by different starting and ending temperatures and losses from the collector during the purge period.

    401.14.2.1.9.2 Data consistency.

    All data shall be consistent with the test conditions. When the pyranometer and pyrheliometer are not covered by the collector cover, the visual radiation shall be set to zero and the sky infrared radiation shall be adjusted to an equivalent sky radiation to account for the covering of the collector during the purge period. Any adjustments shall be noted in the test report.

    401.14.2.1.9.3 Processing for component model calibration using transient system simulation software.

    Upon receipt of the processed data, the certification body shall create a series of computer models using transient system simulation software. One model shall be created for each test. This model is called the “audit” model. Each of the audit models is then fit to the test data as indicated in Items 1 through 4:

    1. 1.Collector heat loss shall be determined as follows:

      1. 1.1.When both capacitance and heat loss tests are performed, the results from the heat loss test and capacitance tests shall be iterated upon until a final value of collector loss rate is determined. The loss value shall be used directly in the model. No other explicit fit is required at this point.

      2. 1.2.When only the heat loss test is performed, the results are used to calibrate a transient system simulation software computer model. The loss value shall be used directly in the model. No other explicit fit is required at this point.

    2. 2.Parameters for heat exchangers integral to a collector shall be used directly in the model. No other explicit calibration is required at this point. The calibration is done by minimizing the chi-squared value for all data sets.

    3. 3.The data from each of the individual data points in the warm-up tests shall be used to calibrate a transient system simulation software computer model using the FRτα and FRUL isothermal initial conditions. A calibration routine shall be used to compare the observed net, solar or auxiliary energy deliveries to the observed data points (one per test). The calibration is done by minimizing the chi-squared (x2) value for all data sets.

      For integral collector storage collectors, the FRUL adjustment is actually a UAloss adjustment since there is no measured value for FRUL. (Note that the ICS nighttime loss test shall be calibrated as part of the data set.) The net result of this process is two points (FRτα and FRUL) that are used in the transient system simulation software model.

    4. 4.When the collector is initially stratified due to the presence of an auxiliary heater, a separate set of tests and calibrations shall be completed. This is required when a heater is located within the storage vessel of a thermosiphon collector.

    401.14.2.2 Specific testing procedures.

    Collectors containing internal storage shall be tested using the procedures described in ISO 9459-4, Annex C, with the following clarifications:

    1. 1.During the collector purge described in ISO 9459-4, Section B.2, a bypass loop shall be used to precondition the inlet water to the specified temperature before introducing water to the test article. Unless otherwise specified, the purge temperature shall be the same temperature as the charge temperature in order to minimize internal energy change in the collector.

    2. 2.During the heat loss test described in ISO 9459-4, Section B.4.1, any source of heating, including resistance heaters and/or solar radiation, shall be shut off or blocked. All pumps shall be shut off for the duration of the test.

    3. 3.During the heat loss test described in ISO 9459-4, Section B.4.1, when internal temperature probes are used, the test shall continue until both of the following are satisfied:

      1. 3.1.The collector temperature drops at least 3°C.

      2. 3.2.The differential between the average collector temperature and the average environmental temperature changes by at least 3°C.

    4. 4.During the warm-up tests described in ISO 9459-4, Section C.3, the temperature in the collector at the beginning of a low-temperature test shall be close to ambient temperature.

    5. 5.During the warm-up tests described in ISO 9459-4, Section C.3, wind at a speed between 1 and 3 m/s shall be required when testing collectors with integral storage tanks or unglazed collectors, or both.

    401.15 Collector incident angle modifier.

    The incident angle modifiers of the collector shall be determined for each test specimen in accordance with ISO 9806, Section 27. Biaxial incident angle modifiers are required on collectors that are nonsymmetrical in their response to irradiance as solar altitude and azimuth change. Data shall be taken in each of the two perpendicular planes that characterize the collector geometry.

    401.15.1 Concentrating collectors.

    Concentrating solar collector testing shall include all operational conditions in which the collector is designed to operate. Incident angle modifiers shall be found for the maximum acceptance angle and all intermediate angles as needed to properly characterize the optical behavior of the collector. Unless the manufacturer stipulates otherwise, the maximum acceptance angle to be tested shall be at least 60 degrees.

    401.15.1.1 Biaxial incident and single angle modifiers testing.

    Biaxial incident angle modifiers testing and reporting shall be conducted on all nontracking concentrating collectors as covered by this standard and any single axis tracking collector where reflectors and/or receivers move independently of each other.

    401.15.1.2 Drawings.

    The manufacturer shall submit a drawing showing the optical normal, transverse plane and longitudinal plane.

    401.16 Pressure drop test.

    The pressure drop across the collector shall be measured as specified in ISO 9806, Section 28.

    401.17 Rain penetration test.

    A rain penetration test shall be performed on glazed collectors as specified in ISO 9806, Section 14.

    401.18 Mechanical load test.

    The ability of the collector to withstand loading by wind or snow shall be determined as specified in ISO 9806, Section 16.

    401.19 Disassembly and final inspection.

    After the completion of testing, test specimens shall be disassembled and inspected in accordance with Section 306. Any visible damage, deformation, discoloration or flaw shall be recorded.