Abstract
The paper attempted to assess the impact of a variable over time heat transfer coefficient on the courses of temperature obtained in the selected areas of the analysed element. The object of the tests was a steam valve. A constant value of this coefficient during such component design is assumed in standards. However, in view of the fact that in devices used in power engineering the state of aggregation of the medium and its flow rate frequently change, the value of the coefficient should be treated as variable. Its value depends on the temperature and pressure. It has been shown that changes in time of the heat transfer coefficient have a strong influence on the temperature distributions in the component.
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