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0 Presentation to Danny McDougall – Richard Perkin IOSH Food and Drink Group
17

Danny McDougall – Richard Perkin - IOSH

Feb 01, 2022

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Page 1: Danny McDougall – Richard Perkin - IOSH

0

Presentation to

Danny McDougall – Richard Perkin

IOSH Food and Drink Group

Page 2: Danny McDougall – Richard Perkin - IOSH

1

Who Are We?

Established 1970

Turnover £30m

260 employees

Page 3: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration Cycle – 4 Main Components

Evaporator

Metering DeviceCondenser

Compressor

Page 4: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration Cycle – Vapour Compression

Page 5: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – Direct Expansion (DX)

Direct Expansion(DX)

HC & HFC’s

Small / MediumChill Stores

Small to MediumCold Stores

Small / MediumChillers

Page 6: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – Flooded / Gravity Feed

Gravity Feed(Flooded)

CO2 & NH3

Medium LargeWater Chillers

Spiral FreezersCascade PlantCondenser /

Evaporators

Page 7: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – Low Pressure Receiver

Low PressureReceiver LPRNH3 & HFC’s

Small / LargePlate HXHT/LT Applications

Medium / LargeChill and ColdStorage

Medium / LargeSpiral / Tunnel

FreezingChilling

Page 8: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – 2Stage Pump Circulation

2Stage PumpCirculationNH3 and CO2

Large Chill &Cold Storage

Large Spiral / BlastChilling &Freezing

Large ProcessingFactories –

All cooling

Page 9: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – System Type Summary

Page 10: Danny McDougall – Richard Perkin - IOSH

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Basic Refrigeration – Ammonia vs R22

R22

Natural

Ammonia(NH3)

Toxic

Pure

Flammable

ODP=0

Man Made

Pure

Non-Flammable

Non-Toxic

ODP=0

ODP=0.055

ODP=1700

Page 11: Danny McDougall – Richard Perkin - IOSH

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Advances in Ammonia Refrigeration

Page 12: Danny McDougall – Richard Perkin - IOSH

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Installations

Cold stores

Freezers

Breweries

Dairies

Ice production

PAST PRESENTand...

Food processing

Chemical andPharmaceuticalproduction

Distinct Ammonia smell

Building services

Oil drums

Water drums

No smell of Ammonia

No oil drums

No water drums

Page 13: Danny McDougall – Richard Perkin - IOSH

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Reasons for Wider Use

More reliable components Improved

system designEFFICIENT

SAFEBetter safety systems

Legislation for Ammonia systems and plant rooms

Advancesin plant control

Page 14: Danny McDougall – Richard Perkin - IOSH

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Components

Valves

Open Drive Pumps

Variable Speed Drives

Oil Separators and Coalescers Adiabatic Condensers

Electronic Expansion ValvesHand Regulated or Thermostatic Valves

Reciprocating

Semi-Hermetic Pumps

Screw

Shell and Tube HX Plate HX

Page 15: Danny McDougall – Richard Perkin - IOSH

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System Design and Construction

Leaky Leak Tight

Flanged Pipes and Fittings

Welded Pipes and Fittings

Large System Charge Reduced (Critical) Charge

Water/Glycol Secondary System

Volatile Secondary System e.g CO2

Internal (Roof Void) Valve Stations

External (Rooftop) Valve Stations

Page 16: Danny McDougall – Richard Perkin - IOSH

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Plant Management

Frequent Manual Oil Draining

High Efficiency Oil Separation and Automatic Recovery

Fixed Head Pressure Floating Head Pressure

Fixed Speed Pumps & Fans

Variable Speed Pumps & Fans

Mechanical/ManualPlant Control

Automatic PLC Plant Control

Manual Air Purging Automatic Air Purging

Page 17: Danny McDougall – Richard Perkin - IOSH

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