Value of researches of a thermal stream. A volume specific thermal capacity

you are: Value of researches of a thermal stream

The volume specific thermal capacity for water makes 4,2 МДж/м3, and for hot magma nearby 2,9 МДж/м3. The water filtering with speed about 10-8 km/s (= 31,5 sm/year) through a layer with a difference of temperatures in 1 °s, bears a thermal stream in size 42 мВт/м2.

Expression means, that the vertical rising stream of water in a layer capacity of 100 m (104 sm) at speed of infiltration of 31,5 sm/year in deposits with heat conductivity 1,25 Vt / (м*К) should increase a thermal tray of 27 times. If over konvektivnoj a zone the impenetrable layer in it accordingly increase and konduktivnyj a thermal stream, and a temperature gradient settles down. In a nontight layer in which there is a stream of fluids, the temperature gradient is very small, warmly practically is completely transferred konvektsiej.

The Definitions of a thermal stream received as a result of measurements of temperature gradients and heat conductivity of rocks, give very low values in those layers in which there is a water circulation. If we deal with a descending stream of water, gradients of temperatures just as temperatures, will be low.

In expression we for all process have excluded dependence on time. The anomalies defined by means of simplified expressions, usually korotkozhivushchie (short-term) as in a section zone between a nontight layer with konvektsiej and area of impenetrable breeds where heat is transferred konduktivno, temperatures will fall rather quickly.

From the point of view of technical use of terrestrial heat low factors of heat conductivity of breeds have that advantage that rather high temperature gradients, despite very small terrestrial thermal stream (cause the radiation reflected from the Moon to the Earth, has the same order). On the other hand, to allocate heat from breed difficultly {and it is rather expensive) because of low factor of heat conductivity.