Exploring low enthalpy geothermal energy in Costa Rica: A pilot project to improve tourism energy matrix efficiency

Abstract

Geothermal energy has been an important and stable part of the renewal energy matrix of Costa Rica for more than 25 years. However, the exploitation has been centred in high enthalpy energy for electric power generation, relegating the low enthalpy range to touristic uses like thermal spas. This pilot project is pioneering in the country, aiming to improve the energy efficiency of a local thermal resort by directly using the geothermal resource available. First, a geochemical and geological characterization of hydrothermal wells, springs and surrounding river was done to study local geothermal potential. Based on local geothermal capacity, direct-use engineering applications of low enthalpy geothermal resource were proposed to meet some energetic necessities of the hotel and enhance its efficiency.