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Overspray sediments deposited on the recuperator fins gradually reduce the cross-section of the recuperator channels. The result of this process is the increase in airflow resistance and thermal resistance during heat transfer. Both phenomena have a negative impact on the reliability of the device. This paper presents the concept of recuperator reliability measures. For this purpose, the essential requirement of reliability (indestructibility) was formulated and damage was defined by identifying it with the loss of air flow reserve and reserve of heat transfer efficiency. On this basis ability features of the heat recovery unit were assessed. Limits of features and critical time of recuperator loss of ability were also assessed.
Odkładające się na lamelach rekuperatora osady lakiernicze powodują stopniowe zmniejszanie przekroju poprzecznego kanałów rekuperatora. Skutkiem tego procesu są wzrosty oporów przepływu powietrza oraz oporu termicznego przy wymianie ciepła. Oba zjawiska wpływają negatywnie na niezawodność urządzenia. W artykule przedstawiono koncepcję miary niezawodności rekuperatora. W tym celu sformułowano podstawowe wymaganie niezawodnościowe (nieuszkadzalność) oraz zdefiniowano uszkodzenia utożsamiając je z utratą zapasu strumienia powietrza oraz zapasu efektywności wymiany ciepła. Na tym tle określono cechy zdatności urządzenia, granice ich obszarów oraz krytyczny czas utraty zdatności rekuperatora.
The right to safety of purchased goods is one of the most important consumer rights. Therefore, an accurate analysis of safety of machinery and equipment purchased on the secondary market is an extremely important issue. One of its elements should be the assessment of the degree of service live usage. In the case of cranes, the subject of such an assessment covers both the supporting structure of the device and its mechanisms and installations. Information on evaluation of the service life expiration of the secondhand cranes may be necessary and support the decision-making process associated with the purchase of the device. The paper deals with the problem of evaluating the expiration of the service life of the supporting structure of cranes coming from the secondhand market. The result of such evaluation makes it possible to determine whether the production capacity of a device has been exhausted. This forms the basis for the decisions on any possible further operation of the crane. The work presents an approach based on the provisions of standard ISO 12482: 2014. This document is the basis for service life evaluation for cranes. The approach presented in it makes the way of analysis dependent on the method used to collect operational data. In this paper the evaluation of service life expiration was prepared on the example of a ship to shore gantry cranes. These devices are characterized by particularly large dimensions and weight. Damage of their supporting structure can lead to the significant losses. Some of these devices change the location during operation. Therefore, it is important to know the current level of their service life usage. A case, in which the operational history of a device is not known, was considered. In the paper the special attention was paid to the methodology of estimating the load distribution coefficient. In order to describe the hypothetical load spectrum, triangular distribution was proposed. The results of the calculations for the structure of port cranes are presented and discussed.
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