Post on 03-Jun-2018
8/13/2019 Seamus Kerr Refrigeration Chilling
1/41
Refrigeration and Chilling
Reducing Electricity Costs and
improving quality
8/13/2019 Seamus Kerr Refrigeration Chilling
2/41
8/13/2019 Seamus Kerr Refrigeration Chilling
3/41
Law of Thermodynamics
Energy cannot be created or destroyed. But
it can be changed from one form to
another.
Refrigeration costs money.
8/13/2019 Seamus Kerr Refrigeration Chilling
4/41
8/13/2019 Seamus Kerr Refrigeration Chilling
5/41
8/13/2019 Seamus Kerr Refrigeration Chilling
6/41
8/13/2019 Seamus Kerr Refrigeration Chilling
7/41
8/13/2019 Seamus Kerr Refrigeration Chilling
8/41
Reducing Electricity Cost.
A. Conserve the cold you have paid for!
B. Reduce the refrigeration manufacturing
cost (efficient refrigerant plant).
8/13/2019 Seamus Kerr Refrigeration Chilling
9/41
A. Cold Conservation
Room Insulation, Air Entry, Product Load, Lighting and Cooler Fans
Product, People
8/13/2019 Seamus Kerr Refrigeration Chilling
10/41
A. Cold Conservation
Room Insulation (Conductive and Radiation)
Air Entry (Infiltration)
Product Load Lighting and Fans
People
8/13/2019 Seamus Kerr Refrigeration Chilling
11/41
Cold Conservation
1 Air Entry (Infiltration)
2 Product Load
3 Room Insulation (Conductive and Radiation)4 People
5 Lighting and Fans
8/13/2019 Seamus Kerr Refrigeration Chilling
12/41
Cold Conservation- Air Entry
8/13/2019 Seamus Kerr Refrigeration Chilling
13/41
Cold Conservation- Air Entry
Cooling Air Costs money
94 kJ/m3 from +25 oC to 10 o C
20m x 20m x 5m room = 2000 m3
Refrigerate t0 10 oC in 1 hr
94 x 2000/3600 = 52 kW
8/13/2019 Seamus Kerr Refrigeration Chilling
14/41
8/13/2019 Seamus Kerr Refrigeration Chilling
15/41
Cold Conservation- Air Entry
28.8 kW Power Input
0.085/kWhr
2.49/hr
8/13/2019 Seamus Kerr Refrigeration Chilling
16/41
8/13/2019 Seamus Kerr Refrigeration Chilling
17/41
Cold Conservation- Air Entry
Poor door sealing
Average Door 3m x 3m
Average Off-set 10mm 0.06 m2 hole
300mm x 200mm
8/13/2019 Seamus Kerr Refrigeration Chilling
18/41
Cold Conservation- Air Entry
Freezer Application 0.06 m2 hole causes loss of approx 0.03m3/s
Cooling Required = 186 kJ/m3 (+25o -25o)
5.85 kW refrigeration
8/13/2019 Seamus Kerr Refrigeration Chilling
19/41
8/13/2019 Seamus Kerr Refrigeration Chilling
20/41
Cold Conservation- Air Entry
3.59 kW Power Input
0.085/kWhr
24 hrs x 365 days 3.59 x 0.085 x 24 x 365 = 2673/per door
8/13/2019 Seamus Kerr Refrigeration Chilling
21/41
8/13/2019 Seamus Kerr Refrigeration Chilling
22/41
8/13/2019 Seamus Kerr Refrigeration Chilling
23/41
8/13/2019 Seamus Kerr Refrigeration Chilling
24/41
PROCESS
WASTE
HEAT
ENERGY
OUTPUT
ENERGY
INPUT
8/13/2019 Seamus Kerr Refrigeration Chilling
25/41
AIR CONDITIONING
8/13/2019 Seamus Kerr Refrigeration Chilling
26/41
8/13/2019 Seamus Kerr Refrigeration Chilling
27/41
8/13/2019 Seamus Kerr Refrigeration Chilling
28/41
EVAPORATIVE COOLING
Air-cooled heat rejection is often beingpreferred due to health & safety, watertreatment and maintenance concerns
Acknowledged cost, energy and sizeadvantages of water cooled systems are
being outweighed by safety concerns andowner responsibilities.
8/13/2019 Seamus Kerr Refrigeration Chilling
29/41
EVAPORATIVE COOLING
Wet Bulb is Typically 6oC to 12oC Lower ThanDry Bulb
Lower Cold Water or Condensing
Temperature By At Least the Wet Bulb to Dry
Bulb Difference
Chiller Absorbed Power Decreases 3% ForEvery 1oC Lower Condensing Temperature
8/13/2019 Seamus Kerr Refrigeration Chilling
30/41
8/13/2019 Seamus Kerr Refrigeration Chilling
31/41
8/13/2019 Seamus Kerr Refrigeration Chilling
32/41
Reduce Refrigeration Cost
A 1.53 COP
B 1.83 COP
20.0 % electricity saving on compressor +
condenser + cooler.
8/13/2019 Seamus Kerr Refrigeration Chilling
33/41
8/13/2019 Seamus Kerr Refrigeration Chilling
34/41
Reduce Refrigeration Cost
Evaporative Cooling Arguments Against
Health and Safety Responsibilities
Water Treatment Requirements
Maintenance and Cleaning
Water Consumption
8/13/2019 Seamus Kerr Refrigeration Chilling
35/41
8/13/2019 Seamus Kerr Refrigeration Chilling
36/41
8/13/2019 Seamus Kerr Refrigeration Chilling
37/41
Reduce Refrigeration Cost
Heat Recovery
PROCESS
WASTE
HEAT
ENERGY
OUTPUT
ENERGY
INPUT
8/13/2019 Seamus Kerr Refrigeration Chilling
38/41
Reduce Refrigeration Cost
Heat Recovery De-superheater
Divert Rejected Heat to Boiler Feed Divert Rejected Heat to Wash Water
(15% of Total Rejected Heat available)
Win Win
8/13/2019 Seamus Kerr Refrigeration Chilling
39/41
8/13/2019 Seamus Kerr Refrigeration Chilling
40/41
8/13/2019 Seamus Kerr Refrigeration Chilling
41/41
Mr. Seamus Kerr, RSL Ireland
THANK YOU
Seamus@rslireland.com