Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Validation

Collection of validation models

Information

This package contains validation models for the classes in Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.

Note that most validation models contain simple input data which may not be realistic, but for which the correct output can be obtained through an analytic solution. The examples plot various outputs, which have been verified against these solutions. These model outputs are stored as reference data and used for continuous validation whenever models in the library change.

Package Content

Name	Description
BypassValve	Validate the control of inline valve
HeatExchangerPump	Validate the control of heat exchanger pump
PredictedOutletTemperature	Validate water side economizer outlet temperature prediction
Tuning_uEcoSta_uTowFanSpeMax	Validate water side economizer tuning parameter sequence

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Validation.BypassValve

Validate the control of inline valve

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.BypassValve.

The validation shows that when the plant is enabled in waterside mode (uPla=true and uWSE=true):

• The condenser water isolation valve to the heat exchanger will be fully open (yConIsoVal=1).
• The economizer in-line chilled water return line valve will be enabled, with the initial position as fully open (yRetVal=1).
• The return line valve will be modulated to maintain the static pressure difference (dpChiWat) across the chilled water side of the heat exchanger at the design value (dpDes).

If the economizer is disabled (uWSE=false), the condenser water isolation valve to the heat exchanger should be fully closed, and the return line valve should be disabled in the fully open position.

Modelica definition

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Validation.HeatExchangerPump

Validate the control of heat exchanger pump

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.HeatExchangerPump. It demonstrates the process of controlling the heat exchanger pump in the following scenarios:

• At 720 seconds, the plant is enabled in waterside economizer mode. The heat exchange pump becomes enabled (yPumOn=true) and the condenser water isolation valve becomes fully open (yConWatIsoVal=1).
• From 720 seconds to 2880 seconds, the pump speed is adjusted by the Trim and Respond sequence based on the speed reset requests that are generated based on the temperature difference between the chilled water return temperature upstream of the economizer and the chilled water temperature entering the heat exchanger.
• At 2880 seconds, the economizer becomes disabled. Thus, the pump is disabled, and the pump speed setpoint becomes 0.

Modelica definition

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Validation.PredictedOutletTemperature

Validate water side economizer outlet temperature prediction

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.PredictedOutletTemperature.

Parameters

Modelica definition

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Validation.Tuning_uEcoSta_uTowFanSpeMax

Validate water side economizer tuning parameter sequence

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Economizers.Subsequences.Tuning.

Modelica definition