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Fig. 1. L' I SIDE SECTION VIEW A 4 + 6 lobed Lysholm machine adapted for hot brine expansion. The male rotor drives the output shaft. W Historically, Lysholm's paper of 1966 described the basic expander application. 2 The rugged characteristics of the engine for use in severe environments were recognized by Wells et al.3 At LLL the Lysholm engine has been studied exten- 3 sively for high temperature applications and as a topping engine for Rankine cy- cles.4 The basic concept of the Lysholm en- gine for geothermal applications has been demonstrated by field tests of an air compressor unit, with 6-in. rotors, modified by the Hydrothermal Power Company, Ltd. (HPCL5 Figure 1 is a diagram of the concept. Tests have been conducted by HPC at the Cerro Prieto field in Mexico and at the East Mesa geo- thermal field in the Imperial Valley of California. In both locations the tests were limited by the available wellhead conditions. The latter tests are reported in Ref. 5. h order to gain a better understanding of the capabilities of the Lysholm engine over a wider range of inlet conditions, closely controlled tests with more pre- cise measurements were conducted by the Lawrence Livermore Laboratory in 6 PLAN SECTION VIEW A schematic diagram of the test set-up is shown in Fig. 2. Inlet pressure to the rotors was varied from 24.4 psia (0.17 MPa) to 76.5 psia (0.51 MPa). Vapor fraction (quality)ranged from 11.6% to the state points of the fluid at various lo- cations. Figure 4 depicts the HPC ex- pander under test. As indicated in test schematic dia- gram, the performance of the engine was determined by means of speed and torque measurements in conjunction with a waterbrake dynamometer. Water flow In all tests the exhaust pressure was one atmosphere. Figure 3 is a 33.3%. temperature-entropy diagram showing Test Description -2- its Geothermal Test Facility.PDF Image | PERFORMANC€ TEST OF A LYSHOLM ENGINE
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