modelX3AWithRadiantFloor

Information

This model demonstrates one potential simulation using the models available in Buildings.ThermalZones.Detailed.FLEXLAB.Rooms.X3A. This example simulates test cell X3A when it is conditioned with a radiant slab. This example model includes heat transfer between the test cell, the outdoor environment, the radiant slab conditioning the test cell, the connected electrical room and closet, and the neighboring test cells.

The connections between the test cell and the external models are described in the following table. Only models not included in the X3A package are included. For documentation describing the connections between X3A models see Buildings.ThermalZones.Detailed.FLEXLAB.Rooms.X3A.

The connections between the closet and external models are described in the following table. Only connections to models not included in the X3A package are described.

The connections between the electrical room and external models are described in the following table. Only connections to models not included in the X3A package are described.

The radiant slab is modeled using an instance of Buildings.Fluid.HeatExchangers.RadiantSlabs.SingleCircuitSlab. All of the inputs used to define the radiant slab are taken from the architectural drawings. The following table describes the connections between models used in the radiant slab. The connection to X3A is not included because it was previously described.

The model only simulates the space conditions, the effects of the radiant slab, and the heat transfer between the rooms. The air handling unit, chilled water plant, shade control, internal gains, and ground temperature are all modeled by reading data from tables. Currently the ventilation air is read from an external data file, via the model airCon, while the others use tables described in the data reader model. The table below shows the name of data input files in the model, what physical phenomena the data file describes, the physical quantity of each data file output, and the source of the data.

In the above table blank entries either show that there is no data to describe, or that the data is describing a quantity for a separate model. Two examples are:

• The table for shaPos only contains data for shade position. Because it only has a y[1] value the remaining columns in the table are left blank.
• airCon, airConClo, and airConEle all share an external data file. They all use the same temperature data, located in y[4] of the external data file. The three room models use different air mass flow rates. airCon uses the flow rate from y[1] in the data file, airConClo uses the flow rate from y[2], and airConEle uses the flow rate from y[3]. Thus, the other entries for each row in the table are left blank because the data is innapropriate for that particular model.

The ventilation air flow rates used during occupied hours in this example were calculated using the assumption of 4 air changes per hour (ACH). It is assumed that there is no ventilation flow during unoccupied hours.

Parameters

Components

Contents

Name	Description
Air	Air model used in the example model
Water	Water model used in the radiant slab loop

Revisions

• January 09, 2017, by Thierry S. Nouidui:
  Fixed wrong port index.
• December 07, 2016, by Thierry S. Nouidui:
  Changed example to place a state at the surface.
• April 21, 2016, by Michael Wetter:
  Replaced ModelicaServices.ExternalReferences.loadResource with Modelica.Utilities.Files.loadResource.
• December 22, 2014 by Michael Wetter:
  Removed Modelica.Fluid.System to address issue #311.
• September 2, 2014, by Michael Wetter:
  Corrected wrong pipe diameter.
• June 30, 2014, by Michael Wetter:
  Specified equations to be used to compute the initial conditions.
• October 11, 2013, by Michael Wetter:
  Added missing parameter keyword in the declaration of the data record.
• Sep 16, 2013 by Peter Grant:
  Added connections to include floor models in Closet and Electrical.
• Jun 10, 2013 by Peter Grant:
  First implementation.