.Buildings.Templates.Components.Data.Chiller

Information

This record provides the set of sizing and operating parameters for the classes within Buildings.Templates.Components.Chillers. It is composed of a set of parameters corresponding to the design (selection) conditions and a sub-record per corresponding to the rating conditions at which the performance curves are calculated.

The record allows two different parameterization logics, depending on the value of the parameter use_datDes. (The user can refer to the valiation model Buildings.Templates.Components.Chillers.Validation.Compression for an illustration of these two logics.)

• If use_datDes=true – default setting that should be used in most cases: The performance data specified in the sub-record per are "translated" so that the capacity and COP calculated at design conditions match the design values cap_nominal and COP_nominal. The performance data that result from this translation are stored in the sub-record perSca which is ultimately used by the chiller models within Buildings.Templates.Components.Chillers.
  Note that the performance data can be specified either by redeclaring the sub-record per, or by simply assigning the performance curves per.capFunT, per.EIRFunT and per.EIRFunPLR in case these curves were calculated based on the design conditions. To support the latter, the design conditions are propagated "down" to the sub-record per but these bindings do not persist after redeclaration so that a record at different rating conditions can also be used.
• If use_datDes=false – non-default setting that should only be used if the rating conditions match the design conditions: The rating conditions specified in the sub-record per are propagated "up" (via the start attribute) and used as design conditions. The sub-record perSca which is ultimately used by the chiller models within Buildings.Templates.Components.Chillers is then identical to the sub-record per. When using this logic, no assignment shall be made for the design parameters, except for the design pressure drops dp*_nominal.

note that placeholders values are assigned to the performance curves, the reference source temperature and the input power in cooling mode to avoid assigning these parameters in case of non-reversible heat pumps. These values are unrealistic and must be overwritten for reversible heat pumps, which is always the case when redeclaring or reassigning the performance record per. Models that use this record will issue a warning if these placeholders values are not overwritten in case of reversible heat pumps.

Note that placeholders values are assigned to the chiller performance curves (per.capFunT , per.EIRFunT and per.EIRFunPLR) to avoid assigning these parameters if typ=Buildings.Templates.Components.Types.Chiller.None. If the chiller type is not None these values are unrealistic and must be overwritten, which is always the case when redeclaring or reassigning the performance record per.