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Table 2 Initial conditions for Shanghai city in winter

From: Exergy and exergoenvironmental assessment of a geothermal heat pump and a wind power turbine hybrid system in Shanghai, China

Sign

Definition

Amount

References

P0[kPa]

Ambient pressure

101.2

T0[°C]

Ambient temperature

6

(Huang et al. 2021)

P1[kPa]

Evaporator pressure

200

(Pishkariahmadabad et al. 2021)

P2[kPa]

Condenser pressure

400

(Pishkariahmadabad et al. 2021)

P9[kPa]

Heat exchanger temperature

1200

(Pishkariahmadabad et al. 2021)

Tsoil[°C]

Soil temperature

15

(Zhai and Yang 2011)

ηcomp1

Compressor 1 efficiency

0.8

(Pishkariahmadabad et al. 2021)

ηcomp2

Compressor 2 efficiency

0.8

(Pishkariahmadabad et al. 2021)

ηgeopump

Geothermal pump efficiency

0.9

(Pishkariahmadabad et al. 2021)

T5[°C]

Heated water temperature

35

(Pishkariahmadabad et al. 2021)

T6[°C]

Entrance water temperature

30

(Pishkariahmadabad et al. 2021)

T7[°C]

Geothermal pump entrance temperature

7

(Pishkariahmadabad et al. 2021)

T8[°C]

Geothermal pump exit temperature

11

(Pishkariahmadabad et al. 2021)

\(\dot{Q}cond\)[kW]

Condenser capacity

100

(Pishkariahmadabad et al. 2021)

\({U}_{s}[\frac{W}{{m}^{2}k}]\)

Soil heat transfer coefficient

12

(Sanaye and Niroomand 2009)

F

The ratio of the number of hours of maximum load to the total number of hours

0.4

(Sanaye and Niroomand 2009)

\({k}_{gl}[\frac{W}{mk}]\)

Heat transfer coefficient of the tube

0.45

(Sayyaadi et al. 2009)

\({d}_{i}\)[m]

Internal diameter

0.0218

(Sayyaadi et al. 2009)

\({d}_{o}\)[m]

Outer diameter

0.0267

(Sayyaadi et al. 2009)

V \([\frac{m}{s}]\)

Fluid speed inside the geothermal tube

1

(Sayyaadi et al. 2009)