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Abstract. One of the When designing a new heat exchanger it is necessary to consider all the conditions imposed on the exchanger and its desired properties. Most often the investigation of heat transfer is to find heat surface. When applying exchanger for proposed hot air engine, it will be a counter-flow heat exchanger of gasgas type. Gas, which transfers the heat will be exhaust gas from the combustion of biomass. An important step in the design and verification is to analyze exchanger designed using numerical methods, the verification of the correctness of design and verification of boundary conditions which include temperatures, flow rates and pressure drops. Due to the fact that the heat transfer in the heat exchanger is a three-dimensional plot and timeindependent, the system is described by partial differential equations that need to be solved by numerical methods.

Abstract. Many industrial technology equipment produces residual (waste) heat. This heat in the form of combustion allows the use of enthalpy drop for heat recovery and can be used to power other devices, which may partially or completely replace the fuel or energy. Significant limiting factor in the construction of systems for heat recovery, however, dust flue contained in flue gas, which adhere to the heat transfer surface area, and when the impossibility of cleaning them often lead to malfunctioning of these devices. This article offers the possibility to use this energy through regenerative devices.

Abstract. Natural gas hydrates are in nature sources of primary energy. They are possible to created in laboratory conditions also under certain temperature and pressure conditions. With determining whether founding suitable conditions is closely linked to the creation of a physical model. The article deals with the model of natural gas hydrates.

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