22 May 2008


In the central area of the Principality of Asturias, situated in the north of Spain, a
large coal field has been mined since the early years of the 19th century in several
exploitation units which along all these years have created an underground void network that
represents an actual big water reservoir from which some value added can be obtained.
A large data base gathering all the parameters related with the waters filling the mine voids
has been created. Besides all the quality-related data as metal and other pollutants content,
flow and temperature are the ones in which we will focus our study. Actually more than 30
million cubic meters of water are pumped every year with temperatures ranging from 19 to 24
degree Celsius.
Furthermore, all the pumping stations are situated within an intensively populated area and
close to university, hospital and other public services big buildings.
The present paper aims to analyze the low enthalpy energy content of the flowing waters
pumped from the mines and to calculate which amount of that energy might be put in a
profitable way into market as domestic, industrial or social buildings heating-cooling systems.