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Feasibility analysis of a medium- to low-temperature enhanced geothermal combined with heat pump system (MLEGHP) for heating application in severely cold regions: a case study in Shenyang, Northeastern China

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Abstract

Ground-source heat pumps (GSHPs) have been widely applied in China in recent years. However, for heating-dominant buildings in cold regions, more heat from the ground is extracted than rejected, which leads to an annual decrease in heat source temperature and degradation of GSHP heating performance. In this study, a novel medium- to low-temperature enhanced geothermal combined with heat pump system (MLEGHP) is proposed for winter heating. Taking Shenyang city as an example, we technologically and economically investigate the applicability of this novel MLEGHP system in heating-dominated regions over a 30-year period. According to real geological data, hydraulic fracturing simulation, reservoir simulation, heating performance assessment, and economic analysis are conducted successively. Results indicate that the MLEGHP system can continuously work efficiently without performance deterioration and strengthen heating reliability during long-term operation in cold regions. Despite the high initial investment, the heat production and payback period of the system are considerable for large-scale projects. Thus, the MLEGHP system is a potential solution for the underground thermal imbalance of GSHP systems and for winter heating in cold regions.

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Abbreviations

C :

Leak-off coefficient

D :

Darcy

E :

Young’s modulus (MPa)

g :

Gravitational acceleration (m/s2)

H :

Height (m)

I R :

Flow impedance (MPa/kg/s)

K :

Permeability (D)

K IC :

Fracture toughness (psi inch1/2)

L :

Length (m)

Q :

Thermal load (kW)

P :

Pressure (MPa)

q :

Flow rate (kg/s)

T :

Temperature (°C)

W :

Input power of pump (MW)

z :

Depth (m)

v :

Poisson’s ratio (–)

σ H :

Maximum horizontal stress (MPa)

σ h :

Minimum horizontal stress (MPa)

σ V :

Vertical stress (MPa)

η :

Energy efficiency

ρ :

Density (kg/m3)

μ :

Fluid viscosity (Pa s)

COP:

Coefficient of performance

EGS:

Enhanced geothermal system

GCHP:

Ground-coupled heat pump

GHE:

Ground heat exchanger

GSHP:

Ground-source heat pump

HDR:

Hot dry rock

HP:

Heat pump

MLEGHP:

Medium- to low-temperature enhanced geothermal combined with heat pump system

TVDSS:

True vertical depth subsea

f :

Fracture

h :

Heat

inj:

Injection

max:

Maximum

min:

Minimum

p :

Pump

pro:

Production

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Acknowledgments

This study was supported by the National High Technology Research and Development Program of China (863 Program) (No. 2012AA052801), the Natural Science Foundation of China (Grant No. 41372239), and the China Postdoctoral Science Foundation (No. 2014M551190).

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Authors and Affiliations

  1. College of Construction Engineering, Jilin University, Changchun, 130026, China

    Ziwang Yu, Liangliang Guo & Yanjun Zhang

  2. Key Lab of Groundwater Resource and Environment Ministry of Education, Jilin University, Changchun, 130026, China

    Yanjun Zhang & Tianfu Xu

  3. Downhole Operation Company of Daqing Oilfield, Daqing, 163453, China

    Chengyu Lan

  4. Tianjin Geothermal Exploration and Development-Designing Institute, Tianjin, 300250, China

    Xianlong Huang

Authors
  1. Ziwang Yu
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  2. Liangliang Guo
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  3. Yanjun Zhang
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  4. Tianfu Xu
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  5. Chengyu Lan
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Correspondence to Liangliang Guo.

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Yu, Z., Guo, L., Zhang, Y. et al. Feasibility analysis of a medium- to low-temperature enhanced geothermal combined with heat pump system (MLEGHP) for heating application in severely cold regions: a case study in Shenyang, Northeastern China. Environ Earth Sci 75, 920 (2016). https://doi.org/10.1007/s12665-016-5717-z

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