HEAT LOSS FROM GEOTHERMAL ENERGY SOURCES

Abstract

The article conducts an analysis of geothermal energy sources in Crimea for various depths of the occurrence. At a depth of up to 1000 m, the temperature is relatively not large from 34 to 65⁰C, and at a depth of 4000 m they reach 175 – 180⁰C in some areas. Formulas are also given for calculating the number of Reynolds and the Nussels number used in determining heat loss from geothermal water to the pipe wall, the temperature of which in turn depends on the temperature of the surrounding soil. It is calculated to reduce the temperature in the pipeline when extracting heated water for various cases, and it was revealed that with the length of the pipeline up to 100 m, it is less than a degree. The greater the water consumption, the less the temperature decreases, and the dependence is nonlinear.

Subject: Geothermal sources of Crimea energy. The study is aimed at solving the problem associated with the extraction of low-temperature water for the supply of it to the consumer.

Materials and methods. Both analytical and calculated methods based on the use of heat transfer processes were used.

Results. It was established that with a stabilized process of extracting geothermal water from the well of the Novoselovskaya site in Crimea, a decrease in temperature for the pipeline section is relatively small, which allows it to be used for the needs of consumer heat supply.

Conclusions. Geothermal springs in Crimea are practically not used, despite the significant potential. The costs of seven sites of geothermal springs with Crimea range in the range from 600 to 4900 m³/day, while, depending on the depth of temperature, either for heat supply to consumers, or for electricity generation. On the example of the Novoselovskaya site with self-gols from 700 to 3500 m³/day, a possible decrease in temperature in the pipeline was revealed. At the same time, the temperature of the water was taken 50⁰C, and the temperature decrease was less than 0.13% per 100 m of the pipeline.