Which of the following statements is/are correct?

Question

BlackTom AI · Accepted Answer

Question restatement: The prompt asks which statements among the given options are correct regarding geothermal power methods and heat pump performance.
Option a: 'Single flash cycle is the most common method in geothermal power production globally.' This statement asserts a specific dominance of the single flash cycle worldwide. In reality, geothermal power plants use several cycles, including single flash, double flash, and binary cycles. While flash cycles (including single flash) have historically been common, the global distribution has shifted with growth in binary-cycle plants, especially for lower-temperature resources. Therefore, this claim is not universally true and is generally considered incorrect or at least misleading as a blanket statement about global usage.
Option b: 'The coefficient of performance of a heat pump is defined as heat power/electric power.' This aligns with the standard definition of COP for heat pumps, where COP = Q_hot (or useful heat delivered) divided by W_input (electrical power). This is a correct and widely accepted definition, though note that some texts specify COP for heating mode as Q_hot/W_in and for cooling mode as Q_cold/W_in, but the core relationship remains COP = useful heat output / electrical input.
Option c: 'Binary cycle is the most common method in geothermal power production globally.' This option claims binary cycles dominate globally. While binary-cycle geothermal plants are prevalent, especially for low- to moderate-temperature resources and for scaling with non-condensing plants, they are not universally cited as the single most common method worldwide. Many regions still rely heavily on flash-steam cycles for higher-temperature resources. Hence, this statement is also not universally correct and is typically considered false or at least not definitively true across all regions.
Summary of reasoning: Option a overstates the dominance of single flash cycles globally and is not broadly accurate given the mix of cycle types in use today. Option b correctly states the COP definition for heat pumps, reflecting the standard engineering convention. Option c similarly overclaims the global dominance of binary cycles, which is not supported by the general industry distribution that includes significant flash-cycle deployments. Therefore, option b is the most defensible correct statement, while a and c are incorrect based on typical geothermal power plant technology distributions and standard COP definitions.

BH40A0102 Basics of Renewable Energy Engineering - Blended teaching 3.3.2025-20.4.2025 Final quiz

Which of the following statements is/are correct?

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