Advisor(s)
Abstract(s)
Bombas de calor geotérmicas são muito utilizadas em países desenvolvidos, porém, são pouco utilizadas no Brasil, em parte porque faltam medidas de temperatura do solo brasileiro. Os objetivos deste trabalho são: apresentar medidas de temperatura geotérmica e comparar o desempenho do sistema geotérmico e do sistema convencional de ar condicionado. Apresentam-se resultados da medição de temperatura geotérmica em dez cidades paranaenses, representativas dos diferentes solos e climas. As medições foram realizadas ao longo de um ano, com equipamentos aferidos e sistemas digitais de aquisição de dados nas diferentes estações de medição instaladas. Os dados de temperatura geotérmica e ambiente foram utilizados para simulação do coeficiente de performance (COP), por meio de software de dimensionamento de sistemas em ciclo de refrigeração por compressão de vapor, baseado no diagrama de pressão-entalpia do fluido de rabalho.
Verificou-se que a temperatura geotérmica medida entre janeiro e outubro de 2013 variou de 16 a 24 °C, enquanto a temperatura ambiente variou entre 2 e 35 °C. Valores médios de COP para o sistema convencional foram de 3,7 (refrigeração) e 5,0 kW/kW (aquecimento), correspondente a 5,9 e 7,9 para o sistema BCG, o que significa ganho em eficiência de 59% com o uso do sistema geotérmico.
Geothermal heat pumps are broadly used in developed countries but scarcely in Brazil, in part because there is a lack of Brazilian soil temperature data. The aims of this work are: to show soil temperature measurements and to compare geothermal heat pumps system performance with conventional air conditioning systems. Geothermal temperature measurement results are shown for ten Paraná State cities, representing different soil and climate conditions. The measurements were made yearlong with calibrated equipment and digital data acquisition system in different measuring stations. Geothermal and ambient temperature data were used for coefficient of performance (COP) simulation, by means of working fluid pressure-enthalpy diagram based software for vapor-compression cycle. It was verified that geothermal temperature measured between Jan/13 to Oct/13 varied from 16 to 24 °C, while ambient temperature has varied between 2 and 35 °C. Average COP values for conventional system were 3.7 (cooling) and 5.0 kW/kW (heating), corresponding to 5.9 and 7.9 kW/kW for geothermal system. Hence it was verified an average efficiency gain of 59% with geothermal system utilization in comparison with conventional system.
Geothermal heat pumps are broadly used in developed countries but scarcely in Brazil, in part because there is a lack of Brazilian soil temperature data. The aims of this work are: to show soil temperature measurements and to compare geothermal heat pumps system performance with conventional air conditioning systems. Geothermal temperature measurement results are shown for ten Paraná State cities, representing different soil and climate conditions. The measurements were made yearlong with calibrated equipment and digital data acquisition system in different measuring stations. Geothermal and ambient temperature data were used for coefficient of performance (COP) simulation, by means of working fluid pressure-enthalpy diagram based software for vapor-compression cycle. It was verified that geothermal temperature measured between Jan/13 to Oct/13 varied from 16 to 24 °C, while ambient temperature has varied between 2 and 35 °C. Average COP values for conventional system were 3.7 (cooling) and 5.0 kW/kW (heating), corresponding to 5.9 and 7.9 kW/kW for geothermal system. Hence it was verified an average efficiency gain of 59% with geothermal system utilization in comparison with conventional system.
Description
Keywords
Bombas de Calor Geotérmicas Refrigeração Mapa Geotérmico.
Pedagogical Context
Citation
Publisher
International Conference on Engineering – Engineering for Society (ICEUBI2015)