Issue 37

E. Mihailov et alii, Frattura ed Integrità Strutturale, 37 (2016) 297-304; DOI: 10.3221/IGF-ESIS.37.39 304 Q el - heat removed by electrodes, W. R - heat resistance, m 2 K/W; T r - surface temperature of the roof, K; c r ins r T , T - average temperature of insulation and wall of cooling panel, K; c- ins r T - temperature between insulation and cooling panel , K; w-c r T - temperature between cooling panel and water , K; T rad - radiation temperature of the total surface F sum =F w-f +F m , K; T m , T w - temperature of the metal and wall, K; in w T , out w T - inlet and outlet temperature of the water, K; T w – average temperature of the cooling water, K; v – cooling water velocities, m/s;  w - heat transfer coefficient by the water, W/m 2 K;  c.el ,  ins ,  s - thickness of cooling elements, insulation and slag layer, m;  c.el ,  ins - coefficient of thermal conductivity of cooling elements and insulation, W/mK;  c.el ,  ef - emissivity of heat roof absorbing surface and effective emissivity of F sum ;  s - dynamic viscosity of the water at the temperature of the surface, N.s/m 2 ;  w - dynamic viscosity at average temperature of the water, Ns/m 2 ;  w - density of the water, kg/m 3 ;  - kinematic viscosity at average temperature of the water, m 2 /s.

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