| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 5.32 MB | Adobe PDF |
Authors
Abstract(s)
O crescente aumento de consumo energético em lojas de comércio alimentar, levou à necessidade de procurar novas metodologias e soluções de modo a racionalizar energia. O consumo energético neste tipo de edifícios é elevado, pertencendo metade da fatia do bolo energético à refrigeração. Devido à necessidade de manter os produtos comercializados nas melhores condições de conservação, as lojas de comércio alimentar são obrigadas a operar os seus equipamentos de refrigeração continuamente, resultando num consumo contínuo de energia. Grande parte deste consumo advém dos expositores de refrigeração/congelação. Este tipo de equipamentos está a ganhar cada vez mais popularidade devido à sua principal funcionalidade, manter o produto conservado em frio e simultaneamente exibi-lo para o consumidor. Contudo, devido aos problemas de funcionamento e elevados consumos apresentados pelos expositores abertos, estes têm vindo a ser substituídos pelos expositores fechados.
Os expositores fechados apresentam um consumo energético menor que os expositores abertos. No entanto, a colocação de uma porta vidrada num expositor acarreta outro problema, o embaciamento da mesma. Para contornar este problema, são aplicados sistemas anti-embaciamento na superfície vidrada deste tipo de expositores. Mas este tipo de sistema é normalmente aplicado sem controlo algum, o que leva a que o mesmo apresente um funcionamento contínuo e posteriormente seja responsável por grande parte da energia consumida por este tipo de expositores. É no contexto de evitar este consumo contínuo por parte destes sistemas que surge o desenvolvimento deste trabalho.
O presente estudo aborda o desenvolvimento e construção de um sensor de humidade de baixo custo e respetivo circuito de controlo para o embaciamento de superfícies vidradas, com a finalidade de evitar o contínuo consumo energético por parte deste sistema. O trabalho em questão inclui ainda o estudo experimental realizado numa bancada de ensaios, com a finalidade de verificar o correto funcionamento dos dispositivos desenvolvidos. O estudo efetuado têm como principal propósito verificar a funcionalidade do sistema anti-embaciamento com um sensor de humidade e respetivo circuito de controlo de baixo custo. Concluiu-se que os equipamentos desenvolvidos permitem monitorizar corretamente o embaciamento, e simultaneamente evitar o contínuo consumo energético.
The energy consumption increase in the food retail sector, promote seeking new solutions and methodologies to rationalize energy. In this type of buildings, the energy consumption is high, belonging half slice of energy consumption to food products refrigeration. Due to the need of keeping the food products marketed under the best storage conditions, food retail stores are required to operate their cooling equipment continuously, resulting in a continuous power consumption. Much of this consumption comes from chilling/freezer display cases. This type of equipment gained popularity due to its main feature, keeping the cold product stored and simultaneously displayed it to the consumer. However, due to the operation problems and high-energy consumption presented by the open display cases, they are been replaced by closed display cases. The closed display cases feature a lower energy consumption than open ones. However, the placement of a glazed door in a display case causes another problem, the fogging of the glass surface. To overcome this problem, anti-sweat heaters are used in this type of display case. But this kind of system is usually applied without any control, which leads to a continuous operation and subsequently responsible for much of the energy consumed by this type of display case. The present work involves the development of a fogging monitoring system that avoids the continuous consumption by these systems. The present study deals with the development and construction of a low cost humidity sensor and respective control circuit of fogging formation in glass surfaces, in order to avoid the continuous power consumption by this system. The present work also includes the experimental study conducted in a bench trial, in order to verify the correct functioning of the developed devices. The studies performed have the main purpose to verify the functionality of the anti-sweat heater with a low cost humidity sensor and respective control circuit. It was concluded that the developed equipment allows proper monitoring and control of fogging formation in the glass surface of closed display cases, avoiding its continuous energy consumption.
The energy consumption increase in the food retail sector, promote seeking new solutions and methodologies to rationalize energy. In this type of buildings, the energy consumption is high, belonging half slice of energy consumption to food products refrigeration. Due to the need of keeping the food products marketed under the best storage conditions, food retail stores are required to operate their cooling equipment continuously, resulting in a continuous power consumption. Much of this consumption comes from chilling/freezer display cases. This type of equipment gained popularity due to its main feature, keeping the cold product stored and simultaneously displayed it to the consumer. However, due to the operation problems and high-energy consumption presented by the open display cases, they are been replaced by closed display cases. The closed display cases feature a lower energy consumption than open ones. However, the placement of a glazed door in a display case causes another problem, the fogging of the glass surface. To overcome this problem, anti-sweat heaters are used in this type of display case. But this kind of system is usually applied without any control, which leads to a continuous operation and subsequently responsible for much of the energy consumed by this type of display case. The present work involves the development of a fogging monitoring system that avoids the continuous consumption by these systems. The present study deals with the development and construction of a low cost humidity sensor and respective control circuit of fogging formation in glass surfaces, in order to avoid the continuous power consumption by this system. The present work also includes the experimental study conducted in a bench trial, in order to verify the correct functioning of the developed devices. The studies performed have the main purpose to verify the functionality of the anti-sweat heater with a low cost humidity sensor and respective control circuit. It was concluded that the developed equipment allows proper monitoring and control of fogging formation in the glass surface of closed display cases, avoiding its continuous energy consumption.
Description
Keywords
Circuito de Controlo Eficiência Energética Expositor de Refrigeração/Congelação Humidade Relativa Sensor de Humidade Sistema Anti-Embaciamento