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Screw compressors
Screw compressors
Speed control systems for compressors
Speed control systems for compressors
NH3-pump receiver
NH3-pump receiver
Ice station and water tank
Ice station and
water tank

Polva Piim, Estonia


Refrigeration equipment for dairy’s ice water production and rooms cooling up to +4oC.

2 pcs Vertical semi hermetic NH3- screw compressors, capacity 852 kW in running conditions -10oC/+30oC, rotation power consumption abt. 208 kW and С.О.P.=4,11. Maximum speed of compressors is 10000 r/min. and their capacity is regulated by speed rotations.
1 pcs Air cooled condenser capacity 1100 kW when temperature difference is 15oC.
1 pcs NH3-pump receiver 4 m3
1 pcs Ice making unit, capacity 4200 kg/h and ice water tank.
8 pcs Air coils for rooms cooling.
1 pcs Receiver 2 m3

Refrigeration plant is controlled by computer.

Cold rooms are cooled by Freezium refrigerant.

Ice water for production use is cooled by falling film heat exchangers. Using them it’s possible also to produce the ice. This process is necessary for the peak loads adjustment during nighttime.

Refrigeration plant is able to produce +0,5oC ice water with evaporation temperature -4oC, which is extremely energy saving.

Compressor room, NH3-condenser and oil cooler Receiver
Compressor room, NH3-condenser and oil cooler Receiver
Liquid cooler Liquid coil
Liquid cooler Liquid coil