.Buildings.Fluid.Chillers.ModularReversible.Validation.TableData2DLoadDep

Information

This model validates Buildings.Fluid.Chillers.ModularReversible.TableData2DLoadDep against the polynomial chiller model Buildings.Fluid.Chillers.ElectricReformulatedEIR for water-cooled chiller applications.

• The validation setup is duplicated from Buildings.Fluid.Chillers.Examples.ElectricReformulatedEIR and the component ref reads the reference results obtained from that model.
• The chiller model is configured to interpolate capacity and power along the evaporator leaving temperature and the condenser leaving temperature.
• The performance data are generated with the same polynomial equations as Buildings.Fluid.Chillers.ElectricReformulatedEIR, using polynomial coefficients from the same data record as the one used in the reference example model, that is Buildings.Fluid.Chillers.Data.ElectricReformulatedEIR.ReformEIRChiller_McQuay_WSC_471kW_5_89COP_Vanes.

Results analysis

There is good agreement with the reference results, except during the model time interval [7200, 7900] s, where the polynomial model computes zero capacity and power. This discrepancy stems from the existence of multiple solutions in the polynomial model. The reference results show one solution with TEvaLvg = TEvaEnt = 20 °C. This temperature exceeds the upper limit per.TEvaLvgMax of the polynomial model's validity range, resulting in a negative capacity that is bounded to 0 in the polynomial model. The data table model reveals that an alternative solution exists where the CHW setpoint is met with a PLR value of about 74 %.

Revisions

• March 21, 2025, by Antoine Gautier:
  First implementation.