.Buildings.Templates.Plants.HeatPumps.Validation.AirToWater

Information

This model validates Buildings.Templates.Plants.HeatPumps.AirToWater by simulating a 24-hour period with overlapping heating and cooling loads. The heating loads reach their peak value first, the cooling loads reach it last.

Three equally sized heat pumps are modeled. All can be lead/lag alternated. 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. An importance multiplier of 10 is applied to the plant requests and reset requests generated from the valve position.

The user can toggle the top-level parameter have_chiWat to switch between a cooling and heating system (the default setting) to a heating-only system. Advanced equipment and control options can be modified via the parameter dialog of the plant component.

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

• staging or unstaging the AWHPs and associated primary pumps,
• rotating lead/lag alternate equipment to ensure even wear,
• resetting the supply temperature and remote differential pressure in both the CHW and HW loops based on the valve position,
• staging 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 29, 2024, by Antoine Gautier:
  First implementation.