Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Validation

Collection of validation models

Information

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

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
DisableChillers	Validation sequence for disabling chillers and the associated devices
Enable	Validation sequence for enabling and disabling chiller plant
EnableDevices	Validation sequence for enabling plant devices

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Validation.DisableChillers

Validation sequence for disabling chillers and the associated devices

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.DisableChillers. It demonstrates the control of disabling plants from chiller mode (disPlaFroChi).

• Before 1800 seconds, the chiller 1 is enabled and the chiller 2 is disabled. The chilled water isolation valve is fully open, and the chiller water pump speed equals the input speed setpoint.
• After 1800 seconds, the chillers are disabled. Thus, both the chilled and condenser water isolation valves are closed, the chilled and condenser water pump speed setpoints become 0, and all the tower cells are disabled.

Modelica definition

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Validation.Enable

Validation sequence for enabling and disabling chiller plant

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Enable. It shows different conditions to enable and disable the plant.

• For instance disPlaReq, the input chiPlaReq becomes greater than the ignorable request ignReq at 32400 seconds and becomes less than the ignorable request at 33000 seconds. The plant is enabled at 32400 seconds, but becomes disabled at 33300 seconds. It allows the plant being enabled for 15 minutes and then becomes disabled.
• For instance disPlaOutTem, the input TOut becomes greater than the lockout temperature TChiLocOut at 4382 seconds. The plant becomes enabled. At 39877.7 seconds, the input TOut becomes lower than the lockout temperature TChiLocOut by 0.556 °C. The plant becomes disabled.
• For instance disPlaSch, the chiller enabling schedule specifies that the plant should be enabled at 600 seconds. However, the plant becomes enabled at 900 seconds as it allows the plant being disabled for 15 minutes. The plant becomes disabled at 68400 seconds, which is specified in the plant scheduling.

Parameters

Modelica definition

Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.Validation.EnableDevices

Validation sequence for enabling plant devices

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Generic.PlantEnable.EnableDevices. It shows how to control devices when the plant is just enabled.

• At 400 seconds, the plant becomes enabled and the initial plant stage is 1. Thus, the plant is enabled in chiller mode. The associated isolation valves, lead primary chiller and condenser water pumps are enabled. From 400 seconds to 2800 seconds, the chiller stage uChiSta equals the initial plant stage uIni thus it is in the plant enabling process.
• At 1200 seconds, which it is still in the plant enabling process, the chilled water and condenser water pumps are proven on. Thus, the lead chiller becomes enabled.
• At 2800 seconds, the plant enabling process is ended. Thus, the control after the moment becomes invalid.

Modelica definition