Post on 28-Jul-2018
transcript
Pega Hrnjak 1/19
45th KGH Congress, Belgrade 3-5 Dec 2014
Latest trend in industrial refrigeration
Pega Hrnjakpega@illinois.eduCo-Director ACRC,
Will Stoecker Res. Professor, University of Illinois, Urbana-Champaign, USA
President, CTSCreative Thermal Solutions
Pega Hrnjak 2/19
I plan to talk about:
• Situation in industrial refrigeration• Direction industry is taking to move towards
lower charges, safer, simpler and more cost effective solutions
Pega Hrnjak 3/19
Industrial refrigeration• Typically applied in:
– Cold stores– Process industry, …
• Custom designed and built (onsite)• Steel is major material• High capacities, large components, huge refrigerant charges• Mostly uses ammonia (NH3)• Requires professional personnel• Well trained technicians and engineers to respond to safety
challenges: real and perceived • Let me illustrate:
Pega Hrnjak 8/19
This very safe industry had some bad days
• Recent accidents in China took several lives• Difficult to come close to urban areas where cold
storage would be beneficial, or large central cooling plants, sport complexes,…
• Very strong pressure for sound environmental solutions strengthens the position of ammonia
• Are we waiting for a big earthquakes in California, Japan,… to realize that not only nukes could be a problem?
Pega Hrnjak 9/19
Direction: decentralization
• Multiple units - lower capacities • Smaller sizes • Reduced charges• Safer• Possibly less expensive (serial production)• Redundancy
There are various options to fit different applications:
Pega Hrnjak 10/19
First step: self contained large facility
• 700 kW ammonia refrigeration packageCourtesy of Industrial Refrigeration Service, Inc.
Pega Hrnjak 11/19
Another option: preassembled systems with CO2 or other coolants
• Can be applied beyond cold storage for:
• Process industry• Central cooling• Sport complexes
NewTonCourtesy of Mycom
Pega Hrnjak 12/19
Rooftop ammonia units are getting
more popular
• Cooling air • Cold stores• Prep rooms
• 150-300 kW ammonia refrigeration units
Courtesy of Evapco
Courtesy of Nextcold, Inc.
Pega Hrnjak 13/19
Some are not afraid of MC options
• Air cooled unit on the roof
Courtesy of Zudek, Inc.
Pega Hrnjak 14/19
Rooftop could be water cooled or organized as chillers
With plate and frame Evap and Cd
With shell & plate Evap and Cd
Pega Hrnjak 15/19
Hermetic ammonia compressors help competiveness of ammonia solutions
for smaller systems -chillers
700 mm
270 mm
700 mm
270 mm
700 mm
270 mm
Courtesy Mycom, Inc.
35 kW NH3 scroll
Pega Hrnjak 16/19
The first real NH3 chiller with hermetic compressor and MC Cd
Courtesy Mycom, Inc.
Pega Hrnjak 17/19
The capacities are getting greater for very low charged NH3 chillers
Courtesy Mycom, Inc.
Pega Hrnjak 18/19
We started air cooled ammonia chillers 15 years ago 18g/kW
Condenser in wind tunnel
Compressor
Accumulator
Plate evaporator
Receiver
Flow meter
Microchannel condenser
Axial fan
Compressor behind
Pressure transducers
Pressure cut-offs
And
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