.Buildings.Fluid.HeatPumps.ModularReversible.Examples.TableData2DLoadDepSHC1And2

Information

This model illustrates the use of Buildings.Fluid.HeatPumps.ModularReversible.TableData2DLoadDepSHC to model a primary-secondary heating and cooling plant. The simulation covers a 24-hour period with overlapping heating and cooling loads. The heating loads reach their peak value first, the cooling loads reach it last.

The plant model includes the following components:

• Modular four-pipe heat pump with three units.
• HW and CHW isolation valves represented by an equivalent actuator.
• Three headered constant-speed primary HW and CHW pumps.
• HW and CHW common legs.
• Three headered variable-speed secondary HW and CHW pumps.

A unique aggregated load is modeled on each loop by means of a cooling or heating component controlled to maintain a constant ΔT and a modulating valve controlled to track a prescribed flow rate.

The closed-loop controls use mostly the same logic as the one described in Buildings.Fluid.HeatPumps.ModularReversible.Examples.TableData2DLoadDepSHC1Only. Only the logic that differs is presented below.

• Primary HW and CHW pump staging based on the number of modules enabled in each mode: See Buildings.Templates.Plants.Controls.Pumps.Generic.StagingHeadered.
• Secondary HW and CHW pumps controlled to maintain a remote differential pressure setpoint: See Buildings.Templates.Plants.Controls.Pumps.Generic.StagingHeadered for the staging and rotation logic, and Buildings.Templates.Plants.Controls.Pumps.Generic.ControlDifferentialPressure for the control logic.

Simulating this model shows how the plant responds to a varying load by

• enabling or disabling the heating and cooling plants, and switching the heat pump operating mode accordingly,
• staging or unstaging the heat pump modules in various modes,
• actuating the corresponding isolation valves,
• staging and rotating the primary pumps, and
• staging, rotating and controlling the secondary pumps to meet the remote differential pressure setpoint.

Contents

Name	Description
Medium	Main medium (common for CHW and HW)

Revisions

• March 23, 2026, by Antoine Gautier:
  Refactored with two separate connectors for heating and cooling on/off commands.
  This is for #4507.
• July 1, 2025, by Antoine Gautier:
  First implementation.