Chillers are a critical piece of plant equipment in delivering the required cooling to the building space. The heat is extracted from the fluid using a refrigerant cycle, also known as the reverse Rankine cycle, with the greatest efficiencies realised when the return temperature is at its highest.

The main components of a chiller are the Evaporator, Compressor, Condenser and Expansion Valve. A diagram of which can be seen below. The flow rate to the chiller is controlled via a control valve, linked to the BMS controller and pump, which maintains the required delta T.


Refrigerant Cycle
Chiller Flow diagram

Recommended Solutions

Crane Fluid Systems has a number of applicable solutions available for this type of terminal. See examples below.

PICV has become the preferred solution for many designers and installers in recent years. However, the option of using the traditional DPCV method is still available and can suit certain applications.

Option 1

Pressure Independent Control Valve (PICV)

  • PICV
    Stand Alone

    • Easy to set up
    • Straightforward commissioning
    • No need for separate Commissioning Set and 2 Port Control Valve
    • Available in sizes up to DN150

Chliler with PICV

Chiller with PICV

Option 2

Differential Pressure Control Valve (DPCV)

  • DPCV
    Stand Alone

    • Range of controllable dPs available
    • Available with Companion Valve
    • Available in sizes up to DN150
    • Requirement for control valves and commissioning set on individual units

Chiller with typical valve arrangement

Chiller with typical valve arrangment