Models for heating and for cooling na old building using Water from a borehole

Abstract

1.Introduction – the main objectives of our work is to make heating and cooling models for an old building using water connected in boreholes located in the vicinity of the building.. Heat transfer by conduction, convection and radiation was considered. With the data obtained it is possible to estimate the quantity of water needed to make the job. One model was made for summer times and another for winter days. Several assumptions were made related with doors and windows open or closed. The water returned from the building in inserted again in the soil, using one of the boreholes. The time required for water to attain temperature equilibrium is only several hours 2. Experimental – Temperature measurements were made in one hole since January 2013 to September 2013. Temperature was measured at several depths using temperature probes. The temperature of the water at 30 m depth ,during this period, was 19ºC.An electrical, dipole-dipole profile was undertaken to verify the existence of connections between the four holes of the region [1]. The results obtained show no connection between holes 4 and 3. 3. Results and Discussion - The results obtained are different from those related to new buildings, with thin walls. We made also a comparison between values obtained with our models and values obtained with the installed equipment. 4. Conclusions – The results obtained for an old building are different from those obtained for new buildings. We need more energy to heat the building in winter than to cool it on summer. 5. References [1] J. Pascoal, Reservatórios geotérmicos: Estudo de um caso real, Tese de Mestrado, Universidade de Évora, 2014.