Measurements of local heat flux to membrane water walls of combustion chambers.

Highlights: [•] Four heat flux tubes for measuring heat flux to water walls were developed. [•] The inverse procedure was used to determine: absorbed heat flux, water-side heat transfer coefficient and fluid temperature. [•] Tests calculations and measurements in a steam boiler were carried out to validate the method proposed in the paper. [•] The flux tubes and inverse procedure are especially appropriate for measuring heat flux in once-through boilers. [ABSTRACT FROM AUTHOR]