Net power output and thermal efficiency data for single and double flash cycles of Cerro Prieto geothermal power plants

The data presented below is the thermodynamic simulation and mathematical model development for the single and double flash cycles of Cerro Prieto geothermal power plants. For more insight into analysis thermodynamic, please see “thermodynamic simulation and mathematical model for single and double flash cycles of Cerro Prieto geothermal power plants” [1]. The datasets contained in this paper are thermodynamic simulations obtained in Aspen Hysys software, the data described represents the net power output and thermal efficiency for Cerro Prieto geothermal power plants, located in Mexicali, México. A single flash and double flash cycle have been selected for power generation at this facility. The single flash net power output and the thermal efficiency data includes eight main parameters: Well temperature (°C), Separator pressure (kPa), Condenser pressure (kPa), Turbine's power (kW), Phase Fraction, Mass Flow (kg/h), Energy input (kW) and Energy output (kW). Whereas the double flash net power output and the thermal efficiency data includes eight main parameters: Well temperature (°C), High-pressure separator (kPa), Low-pressure separator (kPa), Condenser pressure (kPa), Turbine's power (kW), Phase Fraction, Mass Flow (kg/h), Energy Input (kW) and Energy output (kW).

Value of the Data The detailed breakdown of a thermodynamic simulation for a single and double flash cycles are presented, which would enable the analysis and mathematical modelling for similar geothermal power plants at other locations. This data provide certainty behind the modelling assumptions and the methodology used for a multiple linear regression, the mathematical modelling approach used to predict the net power and the thermal efficiency for single and double flash cycles. This data provides assistance for the enforcement of an exergoeconomic analysis of single and double flash cycles for Cerro Prieto geothermal power plants.
Data obtained by of a thermodynamic simulation of a single and double flash cycles is presented, which would enable an exergy analysis aimed to propose a modification to the single and double flash-organic Rankine cycles.

Data
Data reported here concern the net power and the thermal efficiency of Cerro Prieto geothermal power plan, the data has been obtained in Aspen Hysys software, using a compilation of numerous hydrogeological and geochemical studies made to Cerro Prieto power plant. The dataset contains raw and filtered sequencing data obtained through the thermodynamic simulation for the single and double flash cycles of Cerro Prieto geothermal power plants. The data files [reads in Microsoft Excel Worksheet (.xlsx)] were deposited at Mendeley Data under dataset accession https://doi.org/10.17632/ 9384yj4xg3.5. Information about simulation parameters in Aspen Hysys, parameters for major stages of a single flash power plant operating at optimal pressure and parameters for major stages of a double flash power plant operating at optimal pressure is presented in Tables 1e3, respectively.
For this single flash cycle research, a well temperature range of 245 Ce255 C is established [2]. The optimal separation pressure reported in the bibliography is 100 kPae1000 kPa [10e13], likewise a pressure range in the separator from 650 kPa to 750 kPa is established for this research. While the condenser pressure is assumed to be in a range from 11.5 kPa to 12.5 kPa, consistent with specialized literature [2,14]. Meanwhile the modelling process of double flash cycle the temperature of the geothermal fluid of Cerro Prieto is considered in between 315 C and 325 C; the pressure in the highpressure separator is established in the ranges from 1050 kPa to 1200 kPa; the pressure in the lowpressure separator is established in the ranges from 385 kPa to 395 kPa; and the pressure in the condenser is established in the ranges from 11.5 kPa to 12.5 kPa [2,15].

Experimental design, materials, and methods
Firstly, a large part of the data has been collected from specialized articles on geothermal power plants. Then a detailed thermodynamic simulation has been developed for each of the geothermal power plants (single and double flash cycles) to obtain the data to be used in a multiple linear regression analysis. The process diagram for the proposed single flash power cycle was made in Hysys and is shown in Fig. 1. The mass flow rate from the production wells, wellhead temperature, pressure in the separator and pressure in the condenser were used to calculate the remaining parameters of the fluid such as enthalpy and entropy [1]. With reference to Fig. 2, the double flash processes, state 1-state 2 and state 3-state 6, are analysed in the same way as the single flash process. The single flash plant was analysed as described previously in this paragraph. Each process generates a fractional amount of steam which is given by the quality of the two-phase mixture [1]. Fig. 3 illustrates the modelling process of single flash cycle developed in Aspen Hysys. The model follows the flow pattern of a geothermal brine. Fluid enters in each component of the plant and its behaviour is analysed with the related balance equation and specifications from the methodology for energy and exergy analysis. Each component has known and unknown parameters. Meanwhile Fig. 4 illustrates the modelling process of a double flash cycle also developed in Hysys. The modelling process is analysed in the same way as the flash process for the single flash plant previously described was.

Data processing
The mathematical model is designed to predict the net power and thermal efficiency for single flash cycles, using the independent variables of well temperature, separator pressure and condenser pressure to obtain a mathematical expression that predicts the behaviour of this cycle, which is widely used in the geothermal power plant of Cerro Prieto. As for the double flash cycles, the well temperature, the pressures in the separators and the condenser pressure are used. Based on the aforementioned, an operation interval is established for both cycles as shown below (Table 1)   temperature, mass flow rate, enthalpy and exergy) at major stages of the single flash and double flash power plants operating at optimal pressure.
All the collected data was statistically analysed to characterize the mathematical model to predict the net power and thermal efficiency for single flash and double flash cycles. Tables 4 and 5 report statistical indicators which describe the 263,402 simulations were generated at the time of the paper preparation.