Evaluation of a ground source geothermal heat pump to save energy and reduce CO2 and noxious gas emissions in a pig house

A ground source geothermal heat pump (GSHP) was installed in a nursery pig house and the inlet and outlet temperature, coefficient of performance (COP), internal room temperature, energy consumption, CO2 and noxious gas emissions and costs were then compared between a control (conventional heating) and GSHP supported room. The mean outflow temperature was higher (P < 0.05) than the inflow in all three segments of the GSHP system. The GSHP room temperature was elevated in the entry, center and back position, except for a reduced temperature in the entry during the first week (P < 0.05). The mean COP was calculated to be 4.46 for the GSHP system over the three week experimental period. Electricity consumption and CO2 emissions were reduced by about 750.73 kW h and 405.39 kg, respectively, in the GSHP system relative to the control. Additionally, the overall energy cost was decreased by about 314.40 USD during the three week experimental period. Reduced NH3, H2S and SO2 gas emissions were observed in the GSHP supported room relative to the control (P < 0.05). Overall, the GSHP system has the potential to minimize energy consumption and reduce green-house and noxious gas emissions, making it an economical and environmentally friendly renewable energy source.