Single U-tube Grouted Borehole

class bhr.single_u_borehole.SingleUBorehole(borehole_diameter: float, pipe_outer_diameter: float, pipe_dimension_ratio: float, length: float, shank_space: float, pipe_conductivity: float, grout_conductivity: float, soil_conductivity: float, fluid_type: str, fluid_concentration: float = 0)[source]

Bases: UTube

calc_direct_coupling_resistance(m_dot: float, temp: float) → tuple[source]
calc_effective_bh_resistance_ubwt(m_dot: float, temp: float) → float[source]

Calculates the effective thermal resistance of the borehole assuming a uniform borehole wall temperature.

Javed, S. & Spitler, J.D. Calculation of Borehole Thermal Resistance. In ‘Advances in Ground-Source Heat Pump Systems,’ pp. 84. Rees, S.J. ed. Cambridge, MA. Elsevier Ltd. 2016.

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius

Returns:

effective thermal resistance, K/(W/m)

calc_effective_bh_resistance_uhf(m_dot: float, temp: float) → float[source]

Calculates the effective thermal resistance of the borehole assuming a uniform heat flux.

Javed, S. & Spitler, J.D. Calculation of Borehole Thermal Resistance. In ‘Advances in Ground-Source Heat Pump Systems,’ pp. 84. Rees, S.J. ed. Cambridge, MA. Elsevier Ltd. 2016.

Eq: 3-67

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius

Returns:

effective thermal resistance, K/(W/m)

calc_grout_resistance(m_dot: float, temp: float) → float[source]

Calculates grout resistance. Use for validation.

Javed, S. & Spitler, J.D. 2017. ‘Accuracy of Borehole Thermal Resistance Calculation Methods for Grouted Single U-tube Ground Heat Exchangers.’ Applied Energy.187:790-806.

Eq: 3

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius

Returns:

grout resistance, K/(W-m)

calc_local_bh_resistance(m_dot: float, temp: float) → float[source]

Calculates the average thermal resistance of the borehole using the first-order multipole method.

Resistance between the fluid in the U-tube(s) to the borehole wall (m-K/W)

Javed, S. & Spitler, J.D. 2017. ‘Accuracy of Borehole Thermal Resistance Calculation Methods for Grouted Single U-tube Ground Heat Exchangers.’ Applied Energy.187:790-806.

Equation 13

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius

Returns:

average thermal resistance, K/(W/m)

calc_total_internal_bh_resistance(m_dot: float, temp: float) → float[source]

Calculates the total internal thermal resistance of the borehole using the first-order multipole method.

Javed, S. & Spitler, J.D. 2017. ‘Accuracy of Borehole Thermal Resistance Calculation Methods for Grouted Single U-tube Ground Heat Exchangers.’ Applied Energy.187:790-806.

Equation 26

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius

Returns:

total internal thermal resistance, K/(W/m)

update_beta(m_dot: float, temp: float) → float[source]

Updates Beta coefficient.

Javed, S. & Spitler, J.D. Calculation of Borehole Thermal Resistance. In ‘Advances in Ground-Source Heat Pump Systems,’ pp. 84. Rees, S.J. ed. Cambridge, MA. Elsevier Ltd. 2016.

Eq: 3-47

Javed, S. & Spitler, J.D. 2017. ‘Accuracy of Borehole Thermal Resistance Calculation Methods for Grouted Single U-tube Ground Heat Exchangers.’ Applied Energy.187:790-806.

Eq: 14

Parameters:

  • m_dot – mass flow rate, kg/s

  • temp – temperature, Celsius