The Research Work of Low Temperature Geothermal Space Heating

Abstract

The low temperature (<100?C) geothermal resources is distributed all over China, the depth of geothermal well is usually within 3000 m for space heating. The geothermal space heating area in China was only 1,900,000 m2 in 1990, but from 2002 it is already over 14,000,000 m2. In order to use that geothermal water, we need to solve plenty of economies related problems such as cut down the temperature of discharging water, increase the ratio of geothermal energy utilization, anti-corrosion, prolong the service life of reservoir etc. This article introduce the Chinese research work on that domain, including various techniques such as the direct space heating system and discharge water temperature control, the indirect space heating system and it is optimization, the non-metal space heating system, the low temperature floor radiation space heating system, the double well re-injection, the heat pump regulate peak load, heating storage etc.