Abstract
To decrease irreversible loss and reduce natural gas consumption of conventional district heating systems based on natural gas fired boilers, new configurations of the district heating system based on natural gas and deep geothermal energy are proposed and analyzed from the perspective of thermodynamics and financial benefit. The results show that the proposed district heating system based on natural gas and deep geothermal energy with absorption heat exchangers and a gas-fired absorption heat pump (DH-AHE-DAHP) not only has higher thermodynamic performance, but also enables us to gain better financial benefit, and its configuration is optimal. Compared with conventional district heating systems based on natural gas, the DH-AHE-DAHP could increase product exergy efficiency by about 12%, reduce natural gas consumption by about 54% and heating cost by about 25%, and its cost-effective heat transmission distance of the primary heating network could approach about 28 km, which contributes to efficient exploiting deep geothermal fields far away from urban districts for space heating.
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