Title:	Real-time monitoring of refrigerated storage using a wireless sensor network: development and validation of the UMITEMP system.
Authors:	FREIRE, M. S. COSTA, D, dos S. SANTOS, A. P. dos FREITAS, S. T. de AMORIM, M. dos N. TURCO, S. H. N.
Affiliation:	MURILO SANTOS FREIRE, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO; DANIEL DOS SANTOS COSTA, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO; ALISSON PEREIRA DOS SANTOS, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO; SERGIO TONETTO DE FREITAS, CPATSA; MAGNO DO NASCIMENTO AMORIM, INSTITUTO FEDERAL GOIANO; SILVIA HELENA NOGUEIRA TURCO, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO.
Date Issued:	2026
Citation:	Journal of Food Process Engineering, v. 49, n. 5, e70570, 2026.
Description:	The objective of this study was to develop and validate UMITEMP, an intuitive system for real-time monitoring of air temperature (Ta) and relative humidity (RH) in cold rooms for table grape storage. The system integrates hardware and software with wireless radio-frequency communication and a web-based interface. A wireless sensor network (WSN) was distributed within the cold room, collecting data every minute and displaying it in interactive charts and maps. Individual calibration of capacitive humidity sensors was required to ensure accuracy. WSN signal quality was unaffected by wall insulation or sensor distance. During the experimental period, RH ranged from 71% to 100%, averaging 85%, below the recommended level for seedless grape storage. The average Ta was 0.4°C, slightly above the ideal range, with maxima of 5.4°C and minima of −1.9°C. Internal spatial variability was observed, with lower Ta and RH variance than in the adjacent corridor, which was more influenced by external conditions and showed temperature increases during weekdays. Results demonstrate that UMITEMP is an effective tool for continuous real-time monitoring of cold rooms, supporting proper management of fresh fruit storage, such as table grapes.
Thesagro:	Uva Pós-Colheita
NAL Thesaurus:	Grapes Seedless varieties
Keywords:	Armazenamento em câmara fria Monitoramento em tempo real Aplicações web Rede de sensores sem fio UMITEMP Uva de mesa Frutas fresca Camera fria
DOI:	https://doi.org/10.1111/jfpe.70570
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATSA)