Deep Groundsourced Heat Exchanger with Coaxial Pipe, Closed Water Circuit-Improvement Proposals in Project Development and Technical Pipe Conception

Abstract

The direct use of deep geothermy by a Deep groundsourced heat exchanger with coaxial pipe, closed water circuit (DGHE) enables to mine heat in a highly profitable, riskless and ecological way anywhere a sufficient base load heat demand is located. Furthermore it is one way of examining hydrogeothermal wells without risky investments in seismics. Projects can be started by test drillings and being finished as DGHE in case of non-profitable well usage.
This paper shows a technical concept to dimension the bore hole diameter in a way that, if deep ground wells are found, the drilling allows a rededication for hydrogeothermal usage. Thus the DGHE exchanger provides a basic concept for low-risk discovering dublette power plant locations.
Furthermore this business strategie paper provides technical and project development improvement proposals. In an active energy-centered-design process this pipe generates heat up to 750kW that could be sold to municipal energy suppliers in a 20 or more years lasting contract with defined prices per kWh and quantity from 4.5 to 5.5 GWh. Cost per unit geothermal heat is thereby equal or below actual heat prices.