In this paper the automatic detection of industrial heat sources is presented. The proposed method processes the thermal band images acquired by the TM sensor on board Landstat 5 satellite. It is based on a morphological image processing method which removes negligible heat sources such as sun-exposed materials, while preserving the significant ones. It can be used to estimate the energy losses...

Abstract. The problem of Rayleigh–Bénard convection with internal heat sources and a variable gravity field is treated. For the case of stress-free boundary conditions, it is proved that the principle of exchange of stabilities holds as long as the product of gravity field and the integral of the heat sources is nonnegative throughout the layer. The proof is based on the idea of a positive oper...

The alternative energy sources are more and more used for production of heat. Several new combustion devices allow co-firing of different fuels, like dendromass and phytomass. The article analyses combustion of wood and straw pellets in the same boiler. Measurements were realized in two automatic heat sources – one is adapted to burn pellets made from wood or straw and another allows only burni...

Rayleigh-Bénard convection with internal heat sources and a variable gravity field is treated with no-slip boundary conditions. It is proved that the principle of exchange of stabilities holds at all Prandtl numbers, as long as the gravity field and the integral of the heat sources both have the same sign. The proof is based on the idea of a positive operator, and uses the positivity properties...

Mathematical robust model of thermo-balance of Earth’s heat fluxes is suggested for such an estimation. Using well-known data (albedo of the Earth’s surface, constant of heat flux from the Sun per square meter of Earth’s outer atmosphere surface, etc.), we could conclude that heating only by the Solar activity is not sufficient to obtain the real meaning of temperature of Earth’s surface. Estim...

A lock-in thermography system is introduced, which allows temperature modulations in the 10 μKrange to be detected. Under certain conditions (homogeneous infrared emissivity and thermal properties, good signal-to-noise ratio), the spatial resolution of lock-in thermographic investigations of local heat sources in electronic devices can be improved by spatial deconvolution. An iteratively workin...

Mathematical model of thermo-balance of Earth’s heat fluxes is suggested for such an estimation. Using well-known data (albedo of the Earth’s surface, constant of the heat radiation from the Sun per square meter of Earth’s outer atmosphere surface, etc.), we could conclude that the process of heating only by the Solar activity is not sufficient to obtain the real meaning of the temperature of E...

In the recent attempts to stimulate alternative energy sources for heating and cooling of buildings, emphasis has been put on utilisation of the ambient energy from ground source and other renewable energy sources. Exploitation of renewable energy sources and particularly ground heat in buildings can significantly contribute towards reducing dependency on fossil fuels. This paper highlights the...

The present work is concerned with unsteady free convection flow of an incompressible electrically conducting micropolar fluid, bounded by an infinite vertical plane surface of constant temperature. A uniform magnetic field acts perpendicularly to the plane. The state space technique is adopted for the one-dimensional problems including heat sources with one relaxation time. The resulting formu...