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8.3.3.2 Number of Data Points. At least four data points shall be taken for each value of tf,i. For the case with a fixed-mount test apparatus, two of the four data points shall be taken during the time period preceding solar noon and the other two shall be taken in the period following solar noon, the specific periods being chosen so that the data points represent times symmetrical to solar noon. This requirement is made so that any transient effects that may be present will not bias the test results when they are used for design purposes. The requirement for obtaining data points equally divided between morning and afternoon is not mandatory when tesing with an altazimuth mount. All test data shall be reported in addition to the fitted curve (see Section 9) so that any difference in efficiency due solely to the operating temperature level of the collector can be discerned in the test report. The curve shall be established by data points that represent efficiency values determined by integrating the data over a time period equal to the time constant, or five minutes, whichever is larger, as determined in accordance with Section 8.3.2. The integrated value of incident solar energy will be divided into the integrated value of energy obtained from the collector to obtain the efficiency value for that test period as described in Section 8.5. 8.3.3.3 Steady-State Conditions. In order to obtain steady-state or sufficiently good quasi-steady-state conditions for the solar collection process, the heat transfer fluid should be circulated through the collector |
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