In tune with today’s environmental and energy drivers Star Refrigeration and Starfrost have developed an environmentally conscious spiral freezer refrigeration solution, Glacier.

ProductGlacier is a complete refrigeration package plant integrating high quality, industrial components with a PLC control system to offer unrivalled performance, reliability and quality. Glacier can operate at either chill or freeze conditions

CompressorGlacier uses the Vilter single screw compressor which offers the following advantages:

› Balanced forces – Forces around the single rotor are balanced, enhancing bearing life when compared to twin screw technology.› Automatic capacity control – Variable capacity and compressor ration control, ensuring high part load efficiency all year around at changing condensing and evaporating temperature.

Aluminium CoilEvaporators used in ammonia systems have traditionally been made using galvanised carbon steel. Ammonia and aluminium are very compatible and have been used in ammonia heat exchangers for decades. The properties of Aluminium make it an ideal metal to use in ammonia refrigeration applications.

The main benefits of an aluminium evaporator are:› Weight - The low density of aluminium compared with zinc galvanised steel results in a much lighter evaporator.› Performance - The thermal conductivity of aluminium is 2 times higher than zinc galvanised steel and has a direct effect on heat transfer efficiency. This also results in faster and more effective defrosts.

Metal Densitykg/m3

Thermal Conducitvity

W/m2 ˚K

Specific Heat capacity Kj/kg ˚K

Aluminium 2643 202 0.90

Carbon Steel 7833 45 0.45

Zinc Galvanised

Steel7048 112 0.39

› Corrosion - Aluminium is more corrosion resistant than zinc galvanised steel when exposed to acetic or citric acids as well as sodium chloride.› Cleaning - The smooth, hard surfaces of aluminium evaporators are ideal for effective cleaning in food processing areas when compared with the irregular surface of zinc galvanised steel.

CondenserThe Glacier package unit will be connected on site to a generously sized evaporative condenser. The condensers have been selected with low condensing conditions (+30˚C) and plenty of spare capacity for quick pull down times at start up.

Environmentally conscious, energy efficient spiral freezer refrigeration plant

Models

GP1 GP2 GP3 GP4 GP5 GP6 GP7 GP8

Refr

iger

atio

n Pa

ckag

e

Capacity (kW) Freezer 104 136 181 212 245 289 365 449

Capacity (kW) Chiller 236 296 359 467 537 563 740 856

Ambient Wet Bulb Temp (˚C) 21 21 21 21 21 21 21 21

Power (V/ph/Hz) 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50 400/3/50

Electrical Supply (kVA) 190 220 265 330 410 410 590 650

Dimensions (m)(l x w x h)

4.0 x 2.5 x 2.5

4.0 x 2.5 x 2.6

4.0 x 2.6 x 2.6

4.0 x 2.6 x 2.6

4.0 x 2.6 x 2.6

5.2 x 2.9 x 2.7

5.2 x 2.9 x 2.7

5.6 x 2.9 x 2.7

Shipping Weight (kg) 6000 6500 7000 7600 7800 8400 9000 10000

CoP Freezer Duty 1.37 1.49 1.52 1.59 1.43 1.56 1.4 1.52

CoP Chiller Duty 2.41 2.51 2.49 2.61 2.4 2.51 2.32 2.44

Motor (kW) 110 132 160 200 250 250 355 400

Enclosure IP23 IP23 IP23 IP23 IP23 IP23 IP23 IP23

Evap

orat

ive

Cond

ense

r Fan Motor (kW) 7.5 7.5 7.5 11 15 15 22 30

Pump Motor (kW) 0.75 0.75 1.5 1.5 2.2 2.2 2.2 4

Water Consumption (l/s) 0.16 0.2 0.27 0.31 0.37 0.42 0.55 0.66

Dimensions (m)(l x w x h)

2.8 x 1.2 x 2.8

3.7 x 1.2 x 2.8

3.7 x 2.4 x 3.1

3.7 x 2.4 x 3.4

3.7 x 2.4 x 3.6

3.7 x 2.4 x 3.8

3.7 x 2.4 x 4.3

3.7 x 3.0 x 4.3

Operating Weight (kg) 2080 2510 3210 3670 5860 6390 7705 8290

Low Pressure ReceiverGlacier’s low charge, low pressure receiver (LPR) offers the following advantages over systems operating with pumped recirculation, gravity feed or DX technology:› Supplies sub-cooled liquid at high pressure which is then expanded at the evaporator inlet stimulating evaporation and improving heat transfer.› LPR system is critically charged and operates with an HP float ensuring only enough liquid is introduced to meet the maximum load requirements.› Does not require a liquid pump as the ammonia is driven by system pressure.› The LPR design ensures that the discharge pressure can be operated at lower conditions than that of conventional direct expansion and pump circulation systems.› The LPR system enables the evaporator coils to operate fully wetted and the vessel, liquid and suction lines sizes are smaller than on comparable systems.› Eliminates the need for a wasteful superheat zone within the evaporator ensuring closer approaches between the refrigerant evaporating temperature and outlet air temperature.

ControlsPlant control is fully integrated and optimised using floating discharge and floating suction pressure. A standard Mitsubishi PLC is programmed by Star Refrigeration to optimise the performance and efficiency of the Glacier’s components and ensure effective operation.

The individual components are factory assembled onto a compact steel baseframe which is easily located and connected on site. These packages come in 8 model sizes to compliment a number of spiral freezer/chiller sizes. An optional weatherproof plant housing is available to avoid the requirement for an internal plantroom.

Information in the table above is subject to change. Please contact Thermo Tech for current technical specification. Revision - September 2010.