Geothermal resources are mostly stored underground in the form of hot dry rock. Their large-scale development and utilization are of great significance for constructing new-type power systems and promoting the transformation of the energy structure. Super-long gravity heat pipe (SLGHP) possess promising application potential in the exploitation of hot dry rock geothermal resources. Firstly

to address the challenge of high equipment cost of conventional SLGHP

a low-cost constructive super-long gravity heat pipe (CSLGHP) scheme is introduced. This scheme consists of a top steam power generation unit

a pipe body partially penetrating into the rock formation

and a heat-extraction borehole drilled in the rock strata

which substantially cuts the pipe material cost of conventional SLGHP. Then

a coupled numerical model combining one-dimensional heat pipe two-dimensional rock zone

together with an economic evaluation method for power generation of heat pipe systems

is adopted to investigate the comprehensive performance and power generation economy of the CSLGHP system. Finally

the results of the examples show that

compared with the SLGHP

the maximum heat extraction power of the CSLGHP is increased by approximately 7%

with a peak power generation capacity of 21 kW; moreover

its heat extraction advantage is more pronounced at low condensation temperatures. Within the given condensation temperature range

the power generation economy of the CSLGHP outperforms that of the SLGHP

with a maximum improvement rate of around 35%. The research results can provide a theoretical basis and technical references for the further optimization and engineering application of the CSLGHP.