This study characterises materials that belong to the group of refuse-derived fuels (RDF). This group of materials regarded as an alternative fuel is derived from industrial, municipal solid and commercial wastes. The aim of this study is to evaluate the quality of waste composition, demonstrate statistically different values and the energy efficiency of the fuel derived from waste. Data on incinerated waste were collected from two different sources. The basic physical and chemical parameters of waste include density and water content. The lower heating value (LHV) of waste, chlorine concentration and ash content of two groups of incinerated waste were also evaluated and compared for a given period of time (one year, with monthly breakdown). Statistical analysis indicated the differences in the combustion of waste groups, visualized by box plots and other diagrams to show the distribution of the results. An analysis of exhaust gas parameters was carried out, both in terms of chemical composition and energy parameters. The RDF combustion process was presented through simulations for the adopted conditions of heat recovery. It was found that for each kilogram of RDF, about 3.85 kWh (13,860 kJ) of heat can be obtained. The combustion process was simulated using Aspen Plus software.
Container transport is the most popular type of sea shipping around the world. The share of reefers (refrigerated container) in the total number of containers transported is about 15%.The worldwide stock of refrigerated containers used for transportation of perishable goods is still growing, while the conventional reefer fleet is shrinking. Still, despite of clean advantages they also carry some risks. Difficult operating conditions of refrigerated containers instigate very high risk of malfunctions, including permanent damage. The majority of articles about refrigerated systems failures, focus mainly on the onshore ones. Publications describing damage of reefers are limited. Therefore, this article attempts to classify and analyze the most frequent failures of container’s refrigeration units. This issue is very important for the crew safety, natural environment and high quality product preservation. The data necessary to perform the analysis come from reports on units damaged over two years. Introduction presents the characteristic of refrigerated containers and problems which occur during their exploitation. Next, the research methodology is presented. Eventually, the research results are presented and discussed. The summary and conclusions close the work.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.