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3.0 DATA QUALITY ASSESSMENT 3.1. DATA QUALITY OBJECTIVES The GHG Center selects methodologies and instruments for all verifications to ensure a stated level of data quality in the final results. The GHG Center specifies data quality objectives (DQOs) for each verification parameter before testing commences and they are summarized in the Test Plan. Each test measurement that contributes to the determination of a verification parameter has stated data quality indicators (DQIs) which, if met, ensure achievement of that verification parameter’s DQO. The establishment of DQOs begins with the determination of the desired level of confidence in the verification parameters. Table 3-1 summarizes the DQOs established in the test planning stage for each verification parameter. The actual data quality achieved during testing is also shown. The next step is to identify all measured values which affect the verification parameter and determine the levels of error which can be tolerated. These DQIs, most often stated in terms of measurement accuracy, precision, and completeness, are used to determine if the stated DQOs are satisfied. The DQIs for this verification - used to support the DQOs listed in Table 3-1 - are summarized in Table 3-2. SRI/USEPA-GHG-VR-27 September 2003 Verification Parameter Power and Heat Production Performance Electrical power output (kW) Electrical efficiency (%) Heat recovery rate (103Btu/hr) Thermal energy efficiency (%) CHP production efficiency (%) Power Quality Performance Electrical frequency (Hz) Voltage Power factor (%) Voltage and current total harmonic distortion (THD) (%) Emissions Performance NOX concentration accuracy CO concentration accuracy O2 and CO2 concentration accuracy THC and CH4 concentration accuracy CO, NOX, and CO2 emission rates (lb/kWh) THC and CH4 emission rates (lb/kWh) Relative (%) /Absolute (units) ± 1.50% / 0.90 kW ± 1.81% / 0.51%c ± 2.50% / 8.75 103Btu/hrc ± 2.24% / 1.07%c ± 2.04% / 1.38%c ± 0.01% / 0.006 Hz 1.01 / 1.21 Vc ± 0.50% / 0.50% ± 1.00% / 0.05% ± 2.0% of spand ± 2.0% of spand ± 2.0% of spand ± 5.0 % of spand ± 5.59%c ± 7.22% c Achievedb Relative (%) /Absolute (units) ± 1.0% / 0.56 kW ± 1.43% / 0.37%c ± 0.55 / 2.05 103Btu/hrc ± 1.16% / 0.61%c ± 0.9% / 0.71%c ± 0.01% / 0.006 Hz 1.01 / 4.99 Vc ± 0.50% / 0.50% ± 1.00% / 0.05% ± 0.9% of span / 0.23 ppmvd ± 0.6% of span / 0.15 ppmvd at full load, ± 0.9% of span / 9.0 ppmvd at reduced loads ± 1.1% of span / 0.1% CO2 ± 0.6% of span / 0.2% O2 ± 2.4% of span/ 0.43 ppmvd at full load, 12.0 ppmvd at reduced loads ± 1.66%c ± 2.69% c Table 3-1 Verification Parameter Data Quality Objectives Original DQO Goala a Original DQO goals as stated in Test Plan. Absolute errors were provided in the Test Plan, where applicable, based on anticipated values. b Overall measurement uncertainty achieved during verification. The absolute errors listed are based on these uncertainties, and the average values measured during the verification c Calculated composite errors were derived using the procedures described in the corresponding subsections (Sections 3.2.2 through 3.2.5). d Determined by evaluating sampling system bias. 3-1PDF Image | Environmental Technology Verification Report
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