Parameters selection method of concentrated radiation heating facility working area

Аuthors

Khudorozhko M. V.^*, Prosuntsov P. V.^**

Baumann Moscow State Technical University, 105005, Moscow, 2nd Baumanskaya St., b. 5, c. 1

*e-mail: khudorozko.mixa@gmail.com
**e-mail: pavel.prosuntsov@mail.ru

Abstract

A variant of a light concentration heating facility with a large number of spherical halogen lamps is proposed. An analytical solution to the problem of determining the incident heat flux on the test object is presented. System consisting of thin-walled cylindrical emitter, a curved specular surface and test object with an arbitrary shape is considered. A good agreement between the analytical and numerical solutions for plane, spherical and cone surfaces is shown. A numerical solution is obtained by finite element method with ray shooting method for view factors culculations. In this case, the determination of the incident heat flux on the test object is reduced to the problem of numerical integration an analytical expression. This approach increases the calculation speed by approximately 2000 times. The dependences of the planar surface object radiant heat flux on the parameters of an elliptical reflector, the size of the radiation source, and the magnitude of the radiation source displacement along the lamp axis are obtained. It is demonstrated that an increase in the rated power of the source leads to an increase in radiant heat flux only up to a certain point, beyond which the flux remains constant. It is determined that the radiating cylinder shifting along the lamp axis by 3 mm leads to a decrease in the lamp's energy efficiency by approximately 1.5 times. Method to determine the design parametrs of the facility working area is proposed. Method is based on minimizing functional difference between calculated and desired radiation heat flux on the surface. By using surrogate optimization approach, the possibility of achieving an average value of the incident heat flux level of 150 W/cm2 on a sample with a diameter of 100 mm is demonstrated. Obtained value of heat flux corresponds to a radiation equilibrium temperature of 2300 K. The facility total energy consumption is 100 kW and its dimensions do not exceed 3 m. The greatest contribution to the radiation heat flux come from lamps positioned at 45 degrees from vertical. This is due to both a reduction in the individual lamp's contribution and an increase in the total number of lamps in the system. 

Keywords:

ultra high-temperature ceramics, inverse problem, halogen lamp, radiation heating facility, concentrated light source, elliptical reflector, simulation of radiation heat transfer

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