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PROCESS REFRIGERATION & FRIDGE PLANT

Use a Smaller Fridge Plant : Balance of Plant Coolant Management Unit for Lower Power Demand
Cryogenic Food & Beverage Process Refrigeration; Ice Banks and Total Loss Refrigeration
Adsorption Refrigeration, Absorption Chillers and Trigeneration


Air conditioning loads alter relatively slowly through the diurnal cycle and calendar year. The essential difference between refrigerated storage and process refrigeration is that processes are dynamic, and require agility of response by the host system. Real-time demands during batch- or batch-continuous operations can vary widely, whilst those due to hybrid applications (such as ground freezing) change gradually and predictably in one direction.

Small fridge plant (see Custom Chillers) is designed for agile response to varying loads, but as heat flows increase, it becomes desirable to reconcile capacity and demand more economically. For example, our Gallery page shows an 85 kW air-cooled chiller serving a process refrigeration application cycling to several times that rate, made possible by a Balance of Plant Coolant Management Unit innovated by Dove Thermal Engineering. It 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 to process stays constant - enabling the fridge plant to operate 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 discharged into the cabin via an expansion turbine for pressurisation and cooling purposes. The Croll Reynolds two-stage vacuum fridge plant illustrated works on the Steam Jet Cycle and recirculates water as its working fluid. Then there is absorption refrigeration, where the mechanical compressor is replaced by an absorber-exchanger using ammonia or lithium bromide as working fluids; or adsorption (then desorption) of the working fluid onto a surface such as methanol onto carbon. In these cases, direct heat is the driving force, making either fridge plant (but particularly adsorption) ideal for trigeneration schemes.

Capacity and Workscope - Typical completions in Process Refrigeration :

Soft Drinks Carbonation Plant for Axis Bottling
Cryogenic Process Refrigeration for Kraft Foods
Evaporator liquid distributors for the Design Council
Transport HVACR coils & systems for Searle Refrigeration