A Chiller is the main item of HVAC plant that provides the energy required to cool a building based on the peak heat gain. By using refrigeration gases, typically R410c or R134a, by compressing or expanding the gas (depending on the building demand) within the refrigeration cycle, energy is transferred through a heat exchanger into the primary water side system.
The required flow rate controlled via the control valve is then pumped around the system. For energy efficiency purposes it is essential that we aim to run chillers at the highest possible Coefficient of Performance (CoP), which is best achieved by having as high as possible delta T between the flow and return water temperatures. CoP is calculated as per the below.
The below diagram demostrates the refrigeration cycle and the main components of a chiller:
Pressure Independent Control Valve (PICV)
– Or –
Differential Pressure Control Valve (DPCV)
- 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
Valves are a part of everyday life – a key component of plumbing and heating systems worldwide. Hattersley has been designing and manufacturing a range of general valves since 1897.
A range of WRAS approved Public Health Valves designed for hot and cold water systems. Ideal for a wide variety of construction projects and especially for buildings with a high footfall.
The Hattersley FutureFlow range offers a wide range of flow management systems as well as static and dynamic balancing valves, providing the ultimate in accuracy and reliability.