| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 6.17 MB | Adobe PDF |
Authors
Abstract(s)
O aproveitamento da energia geotĆ©rmica de muito baixa entalpia mediante a utilizaĆ§Ć£o de
tubos enterrados no solo tem sido visto como uma estratƩgia capaz de contribuir para a
poupanƧa de energia no setor dos edifĆcios. No presente trabalho Ć© proposto um permutador
de calor ar-solo, de formato inovador e compacto, como estratƩgia de arrefecimento.
Adicionalmente, Ć© proposta a monitorizaĆ§Ć£o da temperatura do solo em trĆŖs localizaƧƵes
diferentes, todas na cidade da CovilhĆ£. Assim, o trabalho agora apresentado incluiu o
desenvolvimento, a construĆ§Ć£o e a implementaĆ§Ć£o, quer do permutador de calor, quer das
sondas de temperatura, e a realizaĆ§Ć£o de estudos experimentais em ambos. De forma sucinta,
o permutador apresenta um circuito de tubagem em formato helicoidal quadrangular, em PVC,
que possui uma entrada e uma saĆda de ar Ć superfĆcie e em que a circulaĆ§Ć£o de ar nos tubos Ć©
efetuada com recurso a um, ou dois, ventiladores hĆ©lico-centrĆfugos aplicados nas respetivas
bocas de admissĆ£o e extraĆ§Ć£o de ar. Relativamente Ć s sondas, estas envolvem cinco pontos de
medida, os quais permitem a monitorizaĆ§Ć£o da temperatura do solo, metro a metro, atĆ© os 5
metros de profundidade. ApĆ³s a construĆ§Ć£o destes elementos, foram implementados nas
localizaƧƵes estabelecidas, em que, posteriormente, foram submetidos a um conjunto de
estudos experimentais que visaram, por um lado, conhecer o desempenho tƩrmico e energƩtico
do permutador na estaĆ§Ć£o de arrefecimento (verĆ£o) e, por outro, analisar o padrĆ£o apresentado
pela temperatura do solo nas trĆŖs localizaƧƵes seleccionadas. Os resultados do estudo relativo
ao permutador revelam que este possui potencialidades para o arrefecimento de edifĆcios. Os
dados obtidos da monitorizaĆ§Ć£o da temperatura do solo, mostram temperaturas adequadas,
quer para o arrefecimento, quer para aquecimento do ar interior de edifĆcios.
The use of geothermal energy of very low enthalpy through the use of pipes buried in the ground, has been seen as a strategy to contribute to energy conservation in the sector of buildings. In this paper it is proposed an air-ground heat exchanger, with innovative and compact design, as cooling strategy. In addition, it is proposed to monitor the soil temperature at three different locations, all in the city of CovilhĆ£. Thus, the work now presented includes the development, construction and implementation of both the heat exchanger and the temperature sensors, and the realization of experimental studies on both. Briefly, the heat exchanger has a helical quadrangular pipe circuit, made of PVC, having an inlet and an air outlet at the ground surface, which air circulation in the tubes is effected using one or two helical-centrifugal fans, applied in the respective mouths of intake and extraction of the air. Regarding the probes, these involve five measurement points, which allow monitoring of soil temperature, meter by meter, up to 5 meters deep. After construction, these elements were implemented in the set locations, which subsequently underwent a series of experimental studies aimed to meet the thermal and energy performance of the heat exchanger in the cooling season (summer) and, analyze the pattern shown by soil temperatures in the three selected locations. The results of the studies show that the heat exchanger has the potential for the cooling of buildings. The data obtained by the temperature monitoring of the soil, show suitable temperatures for cooling and heating the indoor air of buildings.
The use of geothermal energy of very low enthalpy through the use of pipes buried in the ground, has been seen as a strategy to contribute to energy conservation in the sector of buildings. In this paper it is proposed an air-ground heat exchanger, with innovative and compact design, as cooling strategy. In addition, it is proposed to monitor the soil temperature at three different locations, all in the city of CovilhĆ£. Thus, the work now presented includes the development, construction and implementation of both the heat exchanger and the temperature sensors, and the realization of experimental studies on both. Briefly, the heat exchanger has a helical quadrangular pipe circuit, made of PVC, having an inlet and an air outlet at the ground surface, which air circulation in the tubes is effected using one or two helical-centrifugal fans, applied in the respective mouths of intake and extraction of the air. Regarding the probes, these involve five measurement points, which allow monitoring of soil temperature, meter by meter, up to 5 meters deep. After construction, these elements were implemented in the set locations, which subsequently underwent a series of experimental studies aimed to meet the thermal and energy performance of the heat exchanger in the cooling season (summer) and, analyze the pattern shown by soil temperatures in the three selected locations. The results of the studies show that the heat exchanger has the potential for the cooling of buildings. The data obtained by the temperature monitoring of the soil, show suitable temperatures for cooling and heating the indoor air of buildings.
Description
Keywords
Arrefecimento e Aquecimento Pelo Solo Energia GeotƩrmica Energia GeotƩrmica de Muito Baixa Entalpia Permutador de Calor Ar-Solo