DoveLogo

PROCESS COOLING

Adiabatic Cooling Towers
Polymer Quench Cooling
Quench Tanks


This is a landing page for related topics on our main website

Click here for Local Feedback Form


polymer emulsion quenching tank with cooling module



Elegant Design

Good design of any cooling system starts with a clear understanding of the host operation and its behaviour. Effective interfacing of a variable load or batch-continuous operation with its cooling equipment is necessary to ensure that the rejection stage runs at maximum efficiency over the full duration of the cycle. A well-designed system will respond organically to imposed loads, with minimal recourse to automated control devices so that it needs no more than (say) an inverter drive or temperature switch to modulate its response. Even when the maths and physics behind an operation might call for some effort, efficiently designed process cooling systems should be elegant in the simplicity of their behaviour and construction.


Dissipator Optimization

Dove Thermal has developed push-pull load management modules to optimize the size and power consumption of radiator, cooling tower, or chiller serving a process; also, manifolded header systems to decouple source and sink behaviours, and split load distribution between different types of dissipator. The thirty-or-so years' experience behind our industrial and process cooling systems assure their value, reliability and long working life.


Adiabatic Cooling Towers

The boundary layer at the surface of a water film or droplet is saturated with low pressure steam whose pressure is a direct function of its bulk temperature. Atmospheric air contains an amount of water vapour proportional to its dry bulb temperature and relative humidity, which also exists at a particular pressure. Any pressure difference causes mass to be transferred and expansion to occur, so that energy is absorbed by the atmospheric moisture and lost by the free water.

Evaporative coolers work on this principle, and the term “adiabatic cooling towers” would have been equally appropriate. The same mechanism applies to (so-called) adiabatic water coolers; these have the advantage of there being less water in open recirculation, and which is thus more easily treated. The Stafford Legionella outbreak of 1985 adversely affected the market for conventional evaporative towers in favour of dry coolers (airblast radiators) and adiabatic coolers (dry coolers arranged for recirculation of water over their tube banks). We have career expertise and experience in this field. While open evaporative cooling towers can provide water at temperatures closer to ambient, dry coolers are able to meet the same requirements for much of the year - although at the expense of higher fan and pump power absorption.


Quenching

Quenching is a fundamental process cooling operation, and entail intimate contact with the operating fluid. This is essential for liquid phase processes where substrates are above quenchant saturation temperature – whether water, aqueous emulsion, mineral oil, or a synthetic HTF (of which polymer quench cooling fluids are a particular class). Various methods may be employed, depending upon whether the operation is being undertaken in air, in mists, or by immersion in bulk quench fluids. Effective recovery treatment and recirculation are necessary for either method, and are significant factors affecting operational economy.


Quench Fluids

A quenchant is selected for its hardening and tempering qualities, which are largely determined by its behaviour in the boundary layer above-and-below saturation temperature. Dove Thermal’s expertise in the design of processes and equipment for thermal fluid heating, and in the specification of heat transfer fluids, cross-links with designing for their behaviour in metallurgical quench cooling operations.


Quench Tanks

Dove Thermal has developed designs for free-standing polymer quench cooling tanks incorporating refrigeration equipment for rapid and accurate tempering of the quenchant (as shown in the isometric). Features include close control of sludging solid suspensions and settlement, condition of the quench fluids, and the physics of the quench cooling operation – for which a family of process models for fluid temperature distribution in quench tanks has been written and tested.

Links to related main site pages:

Process Cooling Systems and Quench Cooling

Process Refrigeration and Fridge Plant

Refrigeration and Airconditioning

HVACR and Marine Aircon

Custom Chillers

Ice Making


Dove Thermal Products

Coolant Management Modules; Drying Tunnels
Steam-Heated Calorifiers; Thermal Oil Heaters
Shell-and-Tube Heat Exchangers; HTF Heaters
Thermal Fluid Heaters; HTF-Heated Calorifiers
Packaged Quench Plants; Air Handling Units
Balance-of-Plant Modules; Cooling Tunnels

Dove Thermal Services

Forensic Engineering; HVRAC Engineering
Consult-Design-Construct Services
Thermal Engineering Consultancy
Process Plant & Process Design
Thermal Fluid Heating Systems
Environmental Systems Design

Dove Thermal Engineering Limited
P.O.Box 5, Uttoxeter, Staffordshire,
ST14 8QX, United Kingdom

Telephone : 01889 569933