Loading...
2 results
Search Results
Now showing 1 - 2 of 2
- Experimental study and numerical simulation of the interior flow in a telecommunications cabinetPublication . Delgado, Christopher B.; Silva, Pedro Dinho da; Pires, Luís Carlos Carvalho; Gaspar, Pedro DinisThe sector of information and communication technologies, especially telecommunications, has grown in a relentless way, leading to an increase in the number of necessary infrastructure to ensure the geographical coverage of the service, having the outdoor telecommunications cabinets (OTC) been an increasingly preferred choice of this type of infrastructure. These cabinets need cooling systems to maintain interior temperatures between desired values, but an effective cooling depends directly on the air flow inside. This paper includes the experimental results of the internal flow and heat transfer in a model a of real OTC, in order to characterize its thermal behavior. The internal air flow is visualized through experimental methods and compared with numerical predictions. The flow occurs mainly in turbulent regime, possessing greater magnitude on the back area of the OTC, where also exist some recirculation zones that can difficult an effective cooling. The results allow to conclude that forced ventilation is an effective method of OTC cooling, combined with low energy consumption.
- Experimental study of the operative conditions of domestic refrigerators in the student community of the university of Beira InteriorPublication . Galvão, Diogo Alexandre Sobreiro; Gaspar, Pedro Dinis; Silva, Pedro Dinho da; Pires, Luís Carlos CarvalhoThe temperature control of domestic refrigerators is crucial to ensure food safety and quality and as a means to reduce food waste. Several studies related to the temperature control of these appliances have been published over the past 15 years. In Portugal, although there are some studies that refer the food storage temperature in refrigerators, there are no studies that on to this influence of this parameter on the food safety. The current refrigerators include compressors with lower power and the appliances are better insulated ensuring a better thermal performance with less energy consumption. However, these outcomes depend on the installation conditions and equipment use. This experimental study is related to the analysis of the operative conditions of the refrigerators of the student community of the University of Beira Interior (Covilhã, Portugal). A test sample of 51 equipments was instrumented with temperature dataloggers, distributed by students who (1) live alone; (2) with their parents; or in conjunction (3) with other students. The test sample appliances have, on average, an electrical power of 126 W and an inner volume of 205 liters. It was found that the average temperature of products storage is 5.5 ºC, just above the food safety threshold. It was determined that the storage air temperature in the appliance increases with the number of people who uses it.