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New trends in the design of individual pieces of equipment in up-to-date waste-to-energy (WtE) plants especially for low or medium capacity are a gradual decrease in spatial requirements (i.e., a move towards higher compactness) and investment and operating costs together with an increase in the overall effectiveness of the plant. This can only be achieved by the reduction in the number of apparatuses and merging functionally different pieces of equipment into singular units, i.e. by employing so-called integrated equipment. Our work is focused on the development of a calculation tool for the design of multifunctional unit coupling function of regenerative heat exchanger and flue gas emission cleaning equipment in one apparatus. This paper presents the results of the first stage of our experimental verification focused on the analysis of the selected type of heat transfer surface from hydraulic characteristics point of view. The results show a good match of the calculated pressure drop with the measured data. Therefore, the selected calculation equation can be used for predicting the pressure drop of the packed bed formed by ball particles. The pressure drop courses also show that the significant effect on their value has the correct determination of the porosity. [ABSTRACT FROM AUTHOR]

Heat regenerators are simple devices for heat transfer, but their proper design is rather difficult. Their design is based on differential equations that need to be solved. This is one of the reasons why these devices are not widely used. There are several methods for solving them that were developed. However, due to the time demands of calculation, these models did not spread too much. With the development of computer technology, the situation changed, and these methods are now relatively easy to apply, as the calculation does not take a lot of time. Another problem arises when selecting a suitable method for calculating the heat transfer coefficient and pressure drop. Their choice depends on the type of packed bed material, and not all available computational equations also provide adequate accuracy. This paper describes the so-called open Willmott methods and provides a basic overview of equations for calculating the regenerative heat exchanger with a fixed bed. Based on the mentioned computational equations, it is possible to create a tailor-made calculation procedure of regenerative heat exchangers. Since no software was found on the market to design regenerative heat exchangers, it had to be created. An example of software implementation is described at the end of the article. The impulse to create this article was also to broaden the awareness of regenerative heat exchangers, to provide designers with an overview of suitable calculation methods and, thus, to extend the interest and use of this type of heat exchanger. [ABSTRACT FROM AUTHOR]