Improving thermal insulation of compressor cooling capacity measurement vessel through heat leakage factor reduction.
The use of a vessel for measuring the cooling capacity of compressors is widely employed in industry, but heat exchange between the vessel and the external environment can generate errors in the measurement. It is essential to reduce the thermal exchange of the vessel with the environment in which i...
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| Tipo de documento: | dissertação |
| Estado: | Versão publicada |
| Data de publicação: | 2025 |
| País: | Brasil |
| Recursos: | Universidade do Estado de Santa Catarina (UDESC) |
| Repositório: | Repositório Institucional da Udesc |
| Idioma: | inglês |
| OAI Identifier: | oai:repositorio.udesc.br:UDESC/23304 |
| Acesso em linha: | https://repositorio.udesc.br/handle/UDESC/23304 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Calorimeter Heat loss factor Thermal insulation Refrigeration Instrumentation |
| Resumo: | The use of a vessel for measuring the cooling capacity of compressors is widely employed in industry, but heat exchange between the vessel and the external environment can generate errors in the measurement. It is essential to reduce the thermal exchange of the vessel with the environment in which it is installed and accurately measure this heat exchange, known as the heat leakage factor. This vessel must be thermally insulated and maintained in an environment with controlled temperature and ventilation, minimizing heat exchange with the external environment, which can result in errors of the mass flow measurement used in the calculation of thermal capacity of the compressor being evaluated. The present work reduces the thermal exchange of the vessel and accurately measure this heat between the surface of the vessel and environment where the vessel is installed, it is possible to identify problems that contribute to the increase of the heat leakage factor, such as a high delta temperature or a large dispersion in temperature around the vessel, leading to an insufficient calibration of the heat leakage factor. A measurement was also performed according to a standard procedure characterizing the current loss factor. Based on the results obtained, a new proposal for enclosing the vessel was designed, improving the thermal insulation of the vessel, reducing points where there was heat exchange by conduction outside the vessel, reducing the speed of the external air, homogenizing the temperature of the airflow with a system of perforated plates. The results obtained were quite significant, with a reduction in the heat loss factor of 84% for first panel and 66% for the second panel, which demonstrates the effectiveness of the new proposal. It was also possible to improve the measurement around the vessel, representing the average temperature more coherently, ensuring that the calibrated loss factor will be smaller, more stable, and reliable. |
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