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Which geothermal systems are composed of hot dry rock (HDR) but no underground water?

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Which geothermal systems are composed of hot dry rock (HDR) but no underground water?

(a) Hybrid geothermal Fossil system

(b) Flashed steam system

(c) Liquid dominated total flow concept

(d) Petro thermal systems

This question was addressed to me in class test.

This intriguing question comes from Hydrothermal Systems in portion Ocean Energy & Geothermal Energy of Energy Engineering

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The correct answer is (d) Petro thermal systems

Explanation: Petro thermal systems are composed of hot dry rock (HDR) but no underground water. They are largest geothermal resource available. The rock occurring at moderate depths has very low permeability and needs to be increasing its heat transfer surface.

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