Calculation of a thermolysis has big practical application. Often it is required to calculate a heating radiator thermolysis to choose type and quantity of the radiators necessary for the concrete room.
Instruction
1. A thermolysis is called heat exchange between the surface of a body and the environment. The thermolysis is spontaneous process of transfer of warmth in space which arises owing to the difference of temperatures and is directed from bigger temperature to smaller.
2. As ideal heat insulators do not exist, warmth can extend in any substances. In the nature there are various ways of transfer of warmth. 1. Contact - warmth is transferred at contact of objects.2. Convective - warmth is transmitted through the intermediate heat carrier.3. Radiation - warmth is transferred by means of electromagnetic waves.
3. In most cases all types of heat exchange are shown at the same time. To calculate a thermolysis, it is possible to use Newton's law — Rikhman.Q=qF=α ∙ (t-ts) of ∙F, W where Q — the power of a heat flux, F — the surface area of a wall which is washed by liquid heat carrier, (t-tc) — the difference of temperatures, α — proportionality coefficient. It is defined by practical consideration and is called thermolysis coefficient. The coefficient of a thermolysis characterizes its intensity.
4. The coefficient of a thermolysis depends on a large number of factors. From a condition of liquid (gaseous, vaporous, drop liquid), from the nature of a current of liquid, from a wall form, from properties of liquid (temperature, pressure, density, thermal capacity, heat conductivity, viscosity) and so on.
5. Thus, it is impossible to make an exact formula for determination of coefficient of a thermolysis. And in each case it is necessary to conduct skilled researches. On physical sense α it is equal to amount of heat which is given by the heat carrier to a wall or, on the contrary, from a wall to the heat carrier having the area of 1 sq.m at the difference of temperatures between liquid and a wall to 1 Calvin during 1 second.