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Federal Technology Alert 5.2.1.1 Baseline Configuration4,5 In an attempt to verify that the labora tory-installed desiccant system’s perfor mance was comparable with the manu facturer-supplied performance data, baseline configuration testing was per formed prior to IES testing. The baseline desiccant unit airflow rates were found to be within the range of 76.5 m3/min to 80.7 m3/min (2,700 to 2,850 scfm) with a face velocity of 262.9 to 277.7 m/min (862.6 to 911.2 ft/min) for the process side and 21.2 to 24.1 m3/min (750 to 850 scfm) for the regeneration side. Process air flow reported by the manufacturer was 68.0 to 70.8 m3/min (2,400 to 2,500 scfm)—slightly lower than the values observed during the tests. The electrical parasitic loads were measured to be between 5.6 and 5.8 kW. A comparison of the Integrated Test Facility test data with the manufacturer’s test data for the process air circuit is presented in Table 5. There was relatively good agreement between the laboratory baseline configuration and the manu facturer’s data for LC. The laboratory results for LC are within +1–5% and +13%, respectively, for the three test conditions. 5.2.1.2 IES Configuration4,5 The IES configuration consisted of a MTG with an HRU and DFDD in a series arrangement with respect to the MTG exhaust gas. As previously stated, the microturbine exhaust gas flowed through the HRU, where hot water was produced, then to the regeneration inlet plenum of the DFDD. The DFDD requires a regenerative air flow of 25.5 m3/min (900 scfm), and the microturbine’s exhaust flow rate of 14.2 m3/min (500 scfm) was not adequate for this direct-fired desiccant unit. In order to provide the required regenerative air flow, the exhaust gas was mixed with outside air at the same conditions as the process inlet air. During these tests, the temperature of the turbine exhaust gas at the HRU outlet ranged from 122.8 to 136.7oC (253 to 278oF). Because of ambient air temperatures and the microturbine being located outdoors, the turbine maximum power output was limited to 25 kW during the tests. Tabulated DFDD latent capacity results for two different microturbine outputs (20 kW and 25 kW) and the direct-fired baseline configuration at three different process/outside air inlet conditions are shown in Table 6. Increasing the power output by 25% from 20 to 25 kW results in an LC increase of 18 to 45%, depending on the process/outside air inlet conditions. The IES maximum LC was observed at the dry-/wet-bulb conditions of 29.4/24.3°C (85.0/75.8°F) and the minimum at 26.7/19.7°C (80.0/67.4°F). The DFDD Table 5. Comparison of manufacturer’s test data and laboratory results (Ref. 5) FEDERAL ENERGY MANAGEMENT PROGRAM –– 15PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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