.Buildings.Fluid.Chillers.ModularReversible.Validation.TableData2DLoadDep_AirCooled

Information

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

• The validation setup is duplicated from Buildings.Fluid.Chillers.Examples.ElectricEIR_AirCooled 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 entering temperature.
• The performance data are generated with the same polynomial equations as Buildings.Fluid.Chillers.ElectricEIR, using polynomial coefficients from the same data record as the one used in the reference example model, that is Buildings.Fluid.Chillers.Data.ElectricEIR.ElectricEIRChiller_York_YCAL0033EE_101kW_3_1COP_AirCooled.

Results analysis

There is good agreement with the reference results, except during the time interval where the PLR value exceeds 1. In this interval the polynomial model computes a significantly higher cooling heat flow rate (in negative value) and a slightly higher power. This discrepancy occurs because the polynomial model calculates the heat flow rate at PLR ≤ 1 while calculating power at PLR ≤ per.PLRMax. Consequently, when PLR increases between 1 and per.PLRMax, input power increases according to the polynomial EIRFunPLR, but the heat flow rate only varies due to the effect of the increasing leaving temperature as the setpoint is no longer met. This appears as a deficiency in the polynomial model that is resolved in the data table model.

Revisions

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