Simulation of reheating in underground pipe by geothermal heat of circulating hot spring water (E)

Abstract

Using a vertical underground pipe, the hot spring water can be basically maintained without an additional heat source, using a simulation of a simulation, using an example of a super Sento in Osaka with a source of 30 to 50 tons per day and recycled hot spring water of 200 to 300 tons. went. Specifically, the results obtained in the first stage in the two-dimensional formation perpendicular to the underground pipe at each depth are integrated in the vertical direction in the second stage, and how the temperature of the input water changes A simulation was performed. Loamy stratum has thermal insulation and heat storage effect. As a result, when the filtered hot spring water with reduced temperature is passed through the underground pipe, it goes through a transient stage with a large endothermic effect, and if it continues for more than several months, it becomes a steady state with a constant endothermic effect.