Abstract
Technological solutions have been proposed for extraction of heat accumulated in hot dry rock with various energy potentials. To extract the heat of low-temperature dry rock mass is shown to be advisable to ensure low heat carrier flow rates in the DHE; so for the depths H = 100, 200 m, the water flow rate G = 0.5–0.6 kg/s is optimal. The technology is presented for a hybrid solar–geothermal system consisting of solar collectors and a DHE coupled with a heat pump. The practical application of this system is shown to be highly efficient. The technological outline of heat and hot water supply with heat extraction from low-enthalpy dry rock in the DHE has been developed. A low-boiling working media is proposed as a working body. Evaluation was carried out of the efficiency of heat extraction from dry rock mass by deep down-hole heat exchangers of different length. The calculations confirmed the possibility of output up to 1 MW of thermal power and more. The technology of enhanced geothermal system with rock hydraulic stimulation and horizontal wells has been developed, and estimations have been carried out on heat removal from rock mass in such a system.
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