04129nam a2200409 4500 20260817162155.0 290998s1991 th r 0000|0 eng d .b10067681 AIT Thesis no. ET-91-12 Paloso, Generoso M. Alternatives for power production with low temperature geothermal systems Bangkok : Asian Institute of Technology, 1991 111 p. Thesis ; no. ET-91-12 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1991 The vast amount of low temperature geothermal resources poses a great challenge to develop and rationally exploit their potentials for power generation. The application of organic Rankine cycles on these resources has broken the barrier and embarked a thrust towards their practical utilization. The technology, however, is limited to certain thermal threshold below which the occurence of the resource is still abundant. The present work offers alternatives to utilize the low enthalpy geothermal resources more economically. The impetus for developing these alternatives emanates from the concept of enhancing the availability of the resource. Absorption cycles are introduced to the Rankine system to boost the heat source temperature on one side and to reduce the heat sink temperature on the other. Computer models have been developed to assess the benefits of coupling absorption heat transformer (AHT) and vapor absorption chiller (VAC) to the organic Rankine cycle. Results indicate that though the work output per kg of geothermal fluid of the combined cycles is generally less than that of the conventional ORC, they have the advantage of requiring smaller components, thus reducing the overall costs of the system. Moreover, their work output per kg of Rankine fluid is larger than the ORC in the order of 180% for the ORC-VAC and· 150% for the AHT- ORC. Among the two alternatives, the AHT- ORC presents a better option from an economic point of view. Aside from requiring less heat exhanger areas, its required turbine sizes are significantly less than ORC- VAC as well as the ORC. However, these turbines may be of multi staged type considering the higher pressure and volume ratio. Further analysis on the costs of different types of turbines, which is not included in the study, would determine their impact on the overall system costs. A sidelight of the study was done on evaluating the performance of an absorption compression refrigeration cascade that utilizes geothermal brine as its heat source. The results showed that operating the refrigeration cascade at condensing temperature of 5° C could reduce the compressor size by 60 to 88%. Geothermal power plants Mohanty, B., Chairperson Mora, Jean-Claude, Examination Committee Bhattacharya, Sribas C., Examination Committee Deutscher Akademischer Austauschdienst (DAAD) Government of Germany, Scholarship Donor Asian Institute of Technology. Thesis ; no. ET-91-12 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17508 .b10067681 mnait x 240409 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003105862 CREATED : 1994-05-16 RECORD # : i10065052 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003105854 CREATED : 1994-05-16 RECORD # : i10065064 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120345482 CREATED : 2016-06-15 RECORD # : i1304039x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 4139 4139 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no. ET-91-12 30050003105862 2026-08-17 16:21:55 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no. ET-91-12 30050003105854 2026-08-17 16:21:55 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. ET-91-12 30050120345482 2026-08-17 16:21:55 2026-08-17 40