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- Characterization of the thermal performance of an outdoor telecommunication cabinetPublication . Silva, Pedro Dinho da; Pires, Luís; Patrício, Carlos Miguel Rosado; Gaspar, Pedro DinisThis work describes the analysis of the thermal performance of an outdoor telecommunication cabinet (OTC) using the computational tool DesignBuilder. The simulation results are compared to the experimental data collected in real cabinet under normal operating conditions. The simulation results show that the air temperature predicted by the model is closer to the temperature measured experimentally inside the cabinet particularly when the weather data files of the computational model have a similar behavior to the actual weather data. Numerical studies show that the use of mechanical ventilation is effective in the extraction of heat generated inside the cabinet.
- Caracterização do comportamento térmico de um armário exterior de telecomunicações móveisPublication . Patrício, Carlos Miguel Rosado; Silva, Pedro Dinho da; Pires, Luís Carlos Carvalho; Gaspar, Pedro DinisThe growing use of telecommunication technologies by society has led the industry to develop infrastructure to support this growth. The telecommunications outdoor cabinets are an important element in the telecommunications network, allowing host and protect the equipment needed to run the network in adverse conditions. The enclosure must have a proper thermal performance to ensure a temperature below 55 ° C, limit for the operation of equipment, and avoid an excessive consumption of electricity. This study aims to characterize the thermal performance of the cabinet using numerical studies with DesignBuilder/EnergyPlus. The development of the numerical model is followed by experimental studies using a real cabinet in operation, to ensure that the model is valid and allows to obtain reliable results. Results allowed to elaborate, quantitatively, a thermal characterization of the cabinet and improve the utilization profile.
- Characterization of the thermal performance of outdoor telecommunication cabinetsPublication . Silva, Pedro Dinho da; Pires, Luís Carlos Carvalho; Patrício, Carlos Miguel Rosado; Gaspar, Pedro DinisThe growing use of telecommunication technologies has led the industry to develop infrastructure to support this progress. The outer telecommunications cabinets are part of the Base Transceiver Station allowing to accommodate and protect from outer adverse conditions a set of electronic equipment needed to operate the mobile communication network. This kind of cabinets should have a proper thermal performance to ensure indoor air temperature below 55°C to avoid exceeding the maximum operating temperature of the electronic equipment. This work describes the analysis of the thermal performance of an outdoor telecommunication cabinet using the computational tool DesignBuilder. The simulation results are compared to the experimental data collected in real cabinet under normal operating conditions. The simulation results show that the air temperature predicted by the model is closer to the temperature measured experimentally inside the cabinet particularly when the weather data files of the computational model have a similar behavior to the actual weather data. Numerical studies show that the use of mechanical ventilation is effective in the extraction of heat generated inside the cabinet. However, there is a limit beyond which increasing the air flow rate does not result in a significant decrease of the cabinet air temperature. The studies also show the importance of the radiant properties and the geographical location of the cabinet. High values of the outer surface cabinet emissivity impair the thermal performance of the cabinet during the day and for some locations, an operational mechanical ventilation system may not be enough to maintain the indoor air temperature below 55°C. Overall, the use of DesignBuilder proved to be very effective for characterizing the thermal performance of telecommunications outdoor cabinets.
- Parametric optimization of surface dielectric barrier discharge actuators for ice sensing applicationPublication . Abdollahzadehsangroudi, Mohammadmahdi; Rodrigues, Frederico; Nunes-Pereira, João; Páscoa, J. C.; Pires, LuísIn this paper a parametric optimization of the dielectric barrier discharge (DBD) plasma actuator is con ducted in order to achieve better ice sensing and deicing performance. For this purpose, different DBD plasma actuators were tested by changing the main geometrical dimension of the DBD plasma actuator and dielectric material. Both the ice sensing and thermal characteristics of the DBD plasma actuator were analyzed and compared. The results reveal that there exists two separate set of optimum parameters that lead to best ice sensing and thermal behavior. For both the sensing and thermal characteristics, the thinnest DBD showed the best performance. Kapton DBD plasma actuator showed the highest surface temperature while PMMA (poly methyl methacrylate) had the best performance for ice sensing. In the end, the deicing performance of a DBD actuator that had in average better thermal and ice sensing performance was tested for deicing an ice layer and a frost layer. The progress of the deicing process and the ice sensing measure on the surface were recorded and analyzed.