THERMAL EFFICIENCY ANALYZING METHOD, PERFORMANCE EVALUATION METHOD, THERMAL EFFICIENCY ANALYSIS PROGRAM, AND PERFORMANCE EVALUATION PROGRAM OF GEOTHERMAL POWER PLANT

摘要

PROBLEM TO BE SOLVED: To provide the thermal efficiency analyzing method, the performance evaluation method, the thermal efficiency analysis program and the performance evaluation program of a geothermal power plant.SOLUTION: Measured values of input and output of instruments which constitute the geothermal power plant and state quantities of working fluid are obtained, and thermal efficiency analysis is performed on the basis of state quantities and a plant analysis model to calculate thermal efficiency of the geothermal power plant and the performance value of each instrument. A condenser characteristic function being the relational formula of a degree of vacuum, an inflow steam rate and cooling water temperature is formed about a condenser, (1) an inflow steam rate in the condenser when condition values are changed is calculated by heat material balance analysis, (2) a first degree of vacuum is calculated from the condenser characteristic function using the inflow steam rate in the condenser, (3) condenser cooling water temperature is calculated by performing heat material balance analysis using the first degree of vacuum, the condition values and performance values, (4) a second degree of vacuum is calculated by the condenser characteristic function using the condenser cooling water temperature, and calculations of (1) to (4) are repeated until values of the first and second degrees of vacuum are made equal to attain convergence.