En el presente trabajo se expone un procedimiento para realizar la automatización y control del caudal de agua de subsuelo que circula por el condensador de un sistema de climatización por compresión de vapor. La innovación realizada permite conseguir una reducción del consumo de agua de subsuelo. La implementación del sistema de automatización logra un control autónomo del caudal de agua empleando un dispositivo genérico. El tiempo y esfuerzo utilizado es bajo y los conocimientos necesarios por parte del investigador son mínimos. La regulación del caudal de agua en función de la temperatura ambiente se implementa utilizando lógica difusa articulada con un programa matemático denominado MatLab. El software de automatización perteneciente al firmware del microcontrolador se desarrolló en un simulador denominado MPLAB que facilita la puesta a punto del hardware del dispositivo genérico. | In this paper a method is disclosed for automation and control of the underground water flow circulating through the condenser of a vapor compression air conditioning system. Innovation made allows for achieving a reduction consumption of subsoiling water. The implementation of the automation system achieves an autonomous control over the flow of water using a generic device. The time and effort used is low and knowledge needed by the research is minimal. The regulation of the water flow according to the ambient temperature is implemented using fuzzy logic articulated with a mathematical program called MatLab. Automation software belonging to the microcontroller firmware was developed in a simulator called MPLAB that facilitates tuning the generic hardware device. | Tema 8: Energías renovables, modelización y simulación. | Facultad de Arquitectura y Urbanismo

Recharge through injection wells is a well-established technique to remediate and protect coastal aquifers from saltwater intrusion. In this study, it is shown that hydrothermal doublet installations can also be used to protect coastal aquifers while producing heat or cold for air conditioning. Such a method could be extremely valuable for situations where there is both a need for freshwater and energy production in coastal regions. The efficiency of the proposed approach is tested using Strack’s analytical solution on a wide range of scenarios where the number of injection and pumping wells vary as well as the distance between these wells and the coast. The efficiency is evaluated through four control parameters: the relative freshwater volume, the maximum penetration distance of the saltwater toe, the thermal breakthrough time, and the percentage of injected water recycled. The analysis of these parameters computed for 343 scenarios confirms the efficiency of the method. Those results are extremely encouraging even if they still need to be confirmed through field experiments.

The isotopic compositions (D and ¹⁸O) of 177 precipitation samples collected at seven observation stations in Toyama Prefecture and one station in Gifu Prefecture in the northern part of central Japan were determined. The source and characteristics of the isotopes were clarified and their contribution to the groundwater flow systems of three major alluvial fans in the same area were investigated. The δD and δ¹⁸O values ranged from −113.3 to −26.7‰ and − 16.4 to −4.2‰, respectively. Precipitation samples collected from May to September (summer) and November to March (winter) plotted along two meteoric water lines, with d-excess = 10 and 30, respectively. Conversely, precipitation samples collected in April and October, and some samples in November to March, plotted between the two meteoric water lines. The contribution of precipitation to the groundwater systems was modelled based on the assumption that groundwater is a mixture of major river water and precipitation. According to the observed δ¹⁸O values for the precipitation, river water, and groundwater samples, the contribution of local precipitation to groundwater reservoirs ranged from 5 to 100%. Groundwater flows near the rivers did not always originate from 100% river runoff; however, the contribution of river runoff to groundwater decreased with increasing distance from the rivers, and groundwater flows far from the river were generated mainly by precipitation. The possibility of using groundwater for a ground-source heat pump system, for air conditioning in houses and to melt the snow on roads, is also discussed.