Parametric analysis of the influence of various factors on the thermal power of the U-shaped pipe radiator
DOI:
https://doi.org/10.15587/1729-4061.2015.37802Keywords:
radiator, absorption coefficient, U-shaped radiator, energy efficiency, reflectorAbstract
Shortcomings of existing methods for calculating the U-shaped “dark” pipe radiators were identified. The features of radiant heat transfer in the radiating system with the symmetric arrangement of the burner and the outgoing branches were formulated. A specified method for calculating “dark” pipe radiators based on their geometric dimensions and optical properties was given. Alternative calculations for different input data were made. The analysis of the influence of the geometric dimensions and optical properties of the U-shaped “dark” pipe radiator on its energy efficiency was performed. It was found that in the studied ranges, the thermal power of the “dark” pipe radiator can be greatly improved by increasing the burner branch temperature and diameter. The need to decrease the negative impact of the outgoing branch was revealed. This can be achieved by reducing its diameter or placing outside the reflector housing in a separate compartment. Moreover, increasing the radiant heat power of the radiator can be achieved by increasing the absorption coefficient of the reflector housing surface and the floor surface. This will reduce the material cost of manufacturing the reflector housing through replacing expensive stainless steel sheet metal or aluminum sheet by sheet metal from conventional carbon steels. The findings can be used when designing U-shaped “dark” pipe radiators.
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