Avaliação de pontos críticos no sistema de refrigeração de um baú de caminhão frigorífico durante o processo de remessa de produtos resfriados e congelados

Abstract

The objective of the current work was listing the main critical points in the process of transporting frozen and chilled products to obtain a general map of reference data and analyzethe temperature profile in a refrigerated truck. Firstly, the thermodynamic functions of the equipment and how they are related to the imposed technical and imensionarestrictions were evaluated. Based on a general understanding of the refrigeration system and references on how logistics in transport and unloading of products generally occur, an assessment of the main critical points and how they affect the refrigeration system of refrigerated transport chambers was proposed. Initially, a questionnaire was prepared and forwarded to companies in this field with questions from the technical and administrative areas, where 15 participants returned their answers through the Google forms platform. The answers were computed and compiled in Excel graphs to obtain an overview of the refrigerated transport. With this collected information, a field research was carried out in a company located in the city of Santa Maria / RS that delivers products in the city of Cachoeira do Sul / RS. The data collection was proposed to evaluate the most contrasting answers of the questionnaire, based on the consulted bibliography. A data-logger was used to collect information on the internal temperature of the chamber during a 24h period, which included the stationary and unloading periods. The data obtained were compiled in the Matlab software, thus temperature graphs as a function of time were generated. At the end of the study, an evaluation of some constrasting responses from collected and bibliography data was carried out to conclude the real importance of knowing heat infiltration as a critical point analyzed. Based on data collection, the heat infiltration during deliveries as a consequence of the doors opening caused a cumulative effect of internal temperature increase, reaching 20°C in some specific points in some periods.