APPLICATION OF DIMENSIONAL ANALYSIS IN HEAT LOSS DETERMINING IN DISTRICT HEATING SYSTEMS

Acta Polytechnica

Mária Čarnogurská¹  Romana Dobáková¹  Miroslav Příhoda² 

[1] Technical University of Košice, Faculty of Mechanical Engineering, Department of Power Engineering,Vysokoškolská 4, 042 00 Košice, Slovakia;VŠB – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Department ofThermal Engineering, 17. listopadu 15, 708 33 Ostrava-Poruba, Czech Republic

关键词: heat loss;    dimensional analysis;    modelling;   

DOI  :  

来源: Czech Technical University in Prague, Faculty of M

【 摘 要 】

Existing procedures for determining the heat loss in heat distribution use balance relations, or rather they are based on the theory of heat and mass transfer. Dimensional analysis enables a new point of view that demonstrated the functionality of heat loss from selected physical quantities that contribute to heat loss. The solution provides one complex criterion and four simplex criteria of similarity. Transforming these criteria of similarity leads to the formulation of the functional dependence of only two criteria, on the basis of which the amount of heat loss can be determined. The resulting criterial dependency is simple, and is calculated in this paper for a pipe one meter in longth. The mathematic model for demonstrating the heat loss is of universal validity, and applies to a wide range of piping used for hot water distribution. However, for each nominal diameter of piping it is necessary to take into account the mutual dependency of the dimensionless argumentsp5onp1 , the form of which is always different. In the paper, this dependency is demonstrated for two nominal diameters DN65 and DN125.

【 授权许可】

Unknown