DoveLogo

 

DIRECTORY    ABOUT    GALLERY    HOME    CONTACT






PROCESS REFRIGERATION


air-cooled chiller for carbonation plant

Coolant Management Modules
Food & Beverage Lines
Cryogenic Processing


Coldstore heat loads tend to be self-damping, while production processes are more likely to be dynamic in character, requiring agile response by the host system. Real-time demands in batch- or batch-continuous operations can vary widely, whilst those of hybrid applications (such as ground freezing) change gradually and predictably in one direction.

While a small fridge plant might respond readily to varying loads, it becomes desirable to reconcile capacity and demand more economically as heat flows increase. For example, the 85 kW air-cooled chiller shown above serves an application cycling to several times that rate. This is enabled by a unit from our range of Coolant Management Units, which balances available fridge plant capacity against prevailing conditions, with "warm" contents passing to the chiller and "cool" contents to the process. Warm coolant passes to the fridge plant at the process discharge temperature, while cold feed temperature remains constant - so the chiller runs efficiently at a steady - but much smaller - loading than would otherwise be presented.

Process refrigeration is remarkable for its variety and ingenuity. For instance, the Air Cycle - used primarily in aircraft - takes compressed air from the propulsion engines, which is then discharged into the cabin via an expansion turbine for pressurisation and cooling purposes.

The Croll Reynolds two-stage vacuum 'fridge plant works on the Steam Jet Cycle, with water as its working fluid. Absorption refrigeration replaces mechanical compression with a mass transfer reactor having ammonia or lithium bromide as working fluids.

An even further variant entails adsorption - then desorption - of the working fluid onto a surface (methanol onto carbon, for example). Also using direct heat as the driving force, it is ideal for trigeneration schemes.


Examples of Process Refrigeration Projects

Soft Drinks Carbonation Plant for Axis Bottling
Cryogenic Process Refrigeration for Kraft Foods
Ice-making equipment design for Sea Ice Limited
Ground Source HVACR plant for University of Wales
Evaporator liquid distributors for the Design Council
Absorption chiller plant evaluation for Home Brewery
Transport refrigeration coil systems for Searle Refrigeration

Dove Thermal Engineering Limited, Uttoxeter, ST14 8QX

Telephone: 01889 569933