Table 1: Main assumptions for analysis (Isfahan case study, month of January).

ParameterValue

General parameters
Design temperature22.5 (°C)
Dead state temperature10 (°C)
Ground temperature17 (°C)
Thermal load10.1 (kW)
Solar irradiance0.2 (kW m−2)
Battery efficiency70%
Power conversion efficiency 18%

GSHX parameters
Working fluidWater
Inlet temperature5 (°C)
Outlet temperature15 (°C)
Soil resistance230 (kW−1 m °C)
Ground pump efficiency 80%
Ground heat exchanger efficiency80%

Heat pump parameters
Evaporator pressure200 (kPa)
Condenser pressure800 (kPa)
RefrigerantR-134a
Condenser efficiency80%
Evaporator efficiency80%
Compressor efficiency 80%
Expansion valve efficiency80%

Room heater parameters
Working fluidWater
Inlet temperature20 (°C)
Outlet temperature30 (°C)
Fan-coil heat exchanger efficiency80%
Fan-coil pump efficiency80%