450
Y. Shimada et al.
Fig. 29.2 LC–CO 2 , LC–NO X , and LC–SO 2 emissions of GSHP and ASHP
29.4.2 Sensitivity Analysis
Figure 29.3 shows the result of sensitivity analysis based on thermal conductivity
and subsurface temperature. The LC–CO 2 emissions of GSHP were reduced by 26–
28.6% compared with ASHP within the scope of sensitivity analysis. Although the
LC–CO 2 emissions were increased in response to the increasing in the total length
of the ground heat exchanger, the changes in those were slight.
The electricity consumption in the operation stage of every condition were almost
equal, since the ground heat exchanger were designed so that the 90th percentile value
of the heat pump inlet water temperature was not exceeding 38 °C. This indicates
Y. Shimada et al.
Fig. 29.2 LC–CO 2 , LC–NO X , and LC–SO 2 emissions of GSHP and ASHP
29.4.2 Sensitivity Analysis
Figure 29.3 shows the result of sensitivity analysis based on thermal conductivity
and subsurface temperature. The LC–CO 2 emissions of GSHP were reduced by 26–
28.6% compared with ASHP within the scope of sensitivity analysis. Although the
LC–CO 2 emissions were increased in response to the increasing in the total length
of the ground heat exchanger, the changes in those were slight.
The electricity consumption in the operation stage of every condition were almost
equal, since the ground heat exchanger were designed so that the 90th percentile value
of the heat pump inlet water temperature was not exceeding 38 °C. This indicates