Low enthalpy heat recovery potential from coal mine discharges in the South Wales Coalfield

摘要: Fossil fuels generate the majority of space heating and hot water demand in UK, contributing to greenhouse gas emissions energy security issues. Concerns about long term availability traditional fossil are recognised by UK government sustainable, low carbon supplies being actively investigated. One such option renewable mix is use enthalpy heat, using open loop ground source technology recover heat from abandoned flooded coal mines. To assess this potential South Wales Coalfield we measured annual temperatures chemistry at sixteen mine sites. Mean monthly ranged 10.3 18.6 °C with an overall mean 13.3 °C, proving their suitability for recovery. Collated data shows geothermal gradient can vary within Coalfield. Exothermic chemical reactions workings also contribute temperature waters. Using discharge estimate that 42 MW could be generated currently monitored discharges, however historic dewatering operational mines suggests 72 generated, enough 6500 homes. The true potential, if new pumping wells were drilled exploit likely much greater. indicate a total emission reduction around 59% 76% compare main electricity respectively.