Ground Source Heat Pump Boiler (GSHPB)

See also

API 레퍼런스: enex_analysis.ground_source_heat_pump_boiler

System Overview

The Ground Source Heat Pump Boiler (GSHPB) couples a vapour-compression refrigerant cycle with a Borehole Heat Exchanger (BHE) on the evaporator side and a thermal storage tank on the condenser side.

System Integration

The GSHPB integrates three major sub-components:

  1. Refrigerant Cycle: The core thermodynamic cycle. See Refrigerant Cycle.

  2. Borehole Heat Exchanger (BHE): The ground thermal response model and circulation pump physics. See Borehole Heat Exchanger (BHE).

  3. Thermal Storage Tank: The DHW buffering and mixing tank. See Thermal Storage Tank.

Unlike air-source systems, the GSHPB evaporator is coupled to the fluid circulating through the BHE, ensuring stable evaporator temperatures independent of ambient air conditions.

Optimal Operating Point

At each simulation time step, the model identifies the optimal evaporation approach temperature (\(\Delta T_\text{ref,evap}\)) that satisfies the physical NTU limits of the evaporator while minimizing the total electrical power input (\(E_\text{tot}\)).

The total power includes both the compressor and the BHE circulation pump:

\[\min_{\Delta T_\text{ref,evap}} \quad E_\text{tot} = E_\text{cmp} + E_\text{pmp}\]

This optimization is solved via 1-D Brent’s method.