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Process Refrigeration


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

Ccoldstore 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.

A small fridge plant (see Custom Chillers) adjusts easily 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 air-cooled chiller of 85kW rated capacity serving an application cycling to several times that rate. This is made possible by a Balance of Plant Coolant Management Unit (see opposite) 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 remains constant - so the chiller runs efficiently at a steady -but much smaller - loading than would otherwise be presented.

While the operating diagram for the conventional reversed Carnot cycle is shown, 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.

Capacity and Workscope in Process Refrigeration :

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