Cold groundwater and geothermal effluent in the Lake Mývatn area has been divided into six distinct groups according to origin and geothermal influence. This division is based on stable isotope ratios, chemical composition and geographical positions. The groundwater has apparently two basically separate origins, i.e. the local high ground north of Lake Mývatn and the highlands far to the south,...

The conversion efficiency of geothermal power developments is generally lower than that of conventional thermal power plants. Confusion can be found in literature concerning the estimation of this conversion efficiency. Geothermal power plants conversion efficiency estimates that is based on the enthalpy of the produced geothermal fluid can be the most desirable for use during the first estimat...

This paper presents a fundamental investigation of the use of conventional Rankine Cycle, Trilateral Flash Cycle, and wet vapour Rankine Cycle system for the generation of power from Enhanced Geothermal Systems. The paper considers ideal Carnot, Trilateral and Quadlateral cycles, and compares the ideal cases of maximum rate of power production with maximum total electricity delivery. These resu...

A single-box-model numerical simulator for personal computer analysis was developed in order to estimate macroscopic parameter values for exploited geothermal reservoirs and essential fluids coming from the depth. The simulator was designed to compute history data concerning total production and reinjection fluids at geothermal power plants from the assumed parameter values, based on conservati...

Italy has a strong geothermal potential for power generation, although, at present, the only two geothermal fields being exploited are Larderello-Travale/Radicondoli and Mt. Amiata in the Tyrrhenian pre-Apennine volcanic district of Southern Tuscany. A new target for geothermal exploration and exploitation in Italy is represented by the Southern Tyrrhenian submarine volcanic district, a geologi...

Geothermal power projects in Turkey are outliers for this technology because of their very high CO2 emissions rates (800-1600 g/kWhr) which are comparable to or significantly exceed those from coal-fired power generation (940-980 g/kW-hr). A “typical” 50 MW geothermal project in Turkey producing 1000 g/kW-hr CO2 emits 1,200 tonnes per day of CO2 to the atmosphere. CO2 is discharged to the atmos...

Anomalous soil mineralogy can indicate buried geologic structures and zones of permeability. Hyperspectral data can be used to map these anomalies in geothermal exploration efforts. This paper describes work done at Dixie Valley, Nevada, in this regard. Dixie Valley, which lies in the Great Basin, west-central Nevada, is host to a structurally controlled deep-circulation geothermal system. Cait...

The possible contribution of Al, Ba, Cd, Co, Cr, Cu, Fe, Mn, Mo, Pb, Sb, Sr, Ti, V and Zn from geothermal exploitation to the environmental contami­ nation of Mt. Amiata was evaluated by assaying the epiphytic lichen Parmelia sulcata from two sampling areas: Piancastagnaio, where there are geothermal power plants, and a remote site distant from geothermal power plants. The results showed that t...