fix impl error introduced in 95b850f that was affecting example13 (regenerated with no change in results)

Author: softwareengineerprogrammer

src/geophires_x/Economics.py

@@ -453,7 +453,7 @@ def _construction_inflation_cost_elec_heat() -> tuple[float, float]:
             capex_elec_plus_infl, capex_heat_plus_infl = _construction_inflation_cost_elec_heat()
 
             LCOE = (capex_elec_plus_infl + np.sum(Coam_elec * discount_vector)) / np.sum(model.surfaceplant.NetkWhProduced.value * discount_vector) * 1E8  # cents/kWh
-            LCOH = (capex_heat_plus_infl * CCap_heat +
+            LCOH = (capex_heat_plus_infl +
                     np.sum((Coam_heat + model.surfaceplant.PumpingkWh.value * model.surfaceplant.electricity_cost_to_buy.value / 1E6) * discount_vector)) / np.sum(model.surfaceplant.HeatkWhProduced.value * discount_vector) * 1E8  # cents/kWh
             LCOH = LCOH * 2.931  # $/MMBTU
 

tests/examples/example13.out

@@ -4,10 +4,10 @@
 
 Simulation Metadata
 ----------------------
- GEOPHIRES Version: 3.9.36
- Simulation Date: 2025-07-25
- Simulation Time:  11:30
- Calculation Time:      0.037 sec
+ GEOPHIRES Version: 3.9.47
+ Simulation Date: 2025-07-31
+ Simulation Time:  08:44
+ Calculation Time:      0.036 sec
 
                            ***SUMMARY OF RESULTS***
 
@@ -27,7 +27,7 @@ Simulation Metadata
 
       Economic Model = Standard Levelized Cost
       Interest Rate:                                          5.00 %
-      Accrued financing during construction:                  0.00 %
+      Accrued financing during construction:                 0.00 %
       Project lifetime:                                      30 yr
       Capacity factor:                                       80.0 %
       Project NPV:                                         -31.42 MUSD