Refrigeration / Fruit and vegetables storages

Carota Sp. z o.o.

For vegetable business with the grocery trade, today’s producers must be able to deliver both premium quality as well as quantity – ideally, twelve months a year. The Polish vegetable cooperative Carota Sp. z o.o. has accordingly designed its cold-storage warehouse capacity for 25,000 tons per week and now relies on efficient, direct ammonia refrigeration engineering from Kelvion.

Kelvion References Refrigeration Carota

The onion harvest comes to an end in September. The bulbs are first dried and then cooled at 4 °C, spread loosely over a perforated floor in six storerooms, and kept well-ventilated. Free cooling with a freshair supply is installed in the onion storage room, supported only by an Air Cooler during the drying phase and at the end of the season in the spring. Air exchange with forced draft ventilation through the piles of onions, 4.50 m tall, is about 100,000 m³/h. The onions are sorted, partially peeled, and packaged only just before delivery. During harvest time, the refrigerating system operates mostly at full capacity. Outside season, cool storage requires less cooling capacity, due to outside temperatures as well as low rotation of stocks. For this reason, Carota Sp. z o.o. specified an air conditioning and refrigerating system that also operate effectively under part loads. Three Kelvion Air Coolers from the SG (HB) range are employed for each carrot storage chamber. For the onions one unit of the same range is used. If required, heat exchangers can be defrosted by hot gas.The evaporating temperature is -8°C for cooling the carrots to storage temperature. During storage operations, the temperature rises to -2 °C.

The individual temperatures required for the ammonia are centrally – and hence energy-efficiently – controlled by the compressors to precisely maintain the temperature set in each cold-storage room. Only for low cooling demand, compressors switch to energysaving part-load operational mode. This feature represents a significant difference from traditional systems in which the compressors always operate in full-load level and cooling is regulated by energyconsuming pressure valves. Part-load operation likewise ensures that air velocity over the product remains low. If the air is only slightly moved in this way, a boundary layer with high humidity forms around the carrots. The carrots lose less water and thus remain succulent longer in the moist protective atmosphere. 2.2 MW frequency controlled refrigeration capacity, condenser fans, units cooler fans and refrigerant pumps run throughout the year on demand and cover particularly partload operation. Carota Sp. z o.o. is well prepared for doing business in Europe thanks to its new production and storage technology. The demand for carrots and onions from Lower Silesia has also grown in the course of last year. Over the middle term, the cooperative reckons with a market quantity of 25,000 to 30,000 tons of vegetables per year.

Kelvion References Refrigeration Carota
Kelvion References Refrigeration Carota
Kelvion References Refrigeration Carota
Kelvion References Refrigeration Carota
Kelvion References Refrigeration Carota
Kelvion References Refrigeration Carota

The onion harvest comes to an end in September. The bulbs are first dried and then cooled at 4 °C, spread loosely over a perforated floor in six storerooms, and kept well-ventilated. Free cooling with a freshair supply is installed in the onion storage room, supported only by an Air Cooler during the drying phase and at the end of the season in the spring. Air exchange with forced draft ventilation through the piles of onions, 4.50 m tall, is about 100,000 m³/h. The onions are sorted, partially peeled, and packaged only just before delivery. During harvest time, the refrigerating system operates mostly at full capacity. Outside season, cool storage requires less cooling capacity, due to outside temperatures as well as low rotation of stocks. For this reason, Carota Sp. z o.o. specified an air conditioning and refrigerating system that also operate effectively under part loads. Three Kelvion Air Coolers from the SG (HB) range are employed for each carrot storage chamber. For the onions one unit of the same range is used. If required, heat exchangers can be defrosted by hot gas.The evaporating temperature is -8°C for cooling the carrots to storage temperature. During storage operations, the temperature rises to -2 °C.

The individual temperatures required for the ammonia are centrally – and hence energy-efficiently – controlled by the compressors to precisely maintain the temperature set in each cold-storage room. Only for low cooling demand, compressors switch to energysaving part-load operational mode. This feature represents a significant difference from traditional systems in which the compressors always operate in full-load level and cooling is regulated by energyconsuming pressure valves. Part-load operation likewise ensures that air velocity over the product remains low. If the air is only slightly moved in this way, a boundary layer with high humidity forms around the carrots. The carrots lose less water and thus remain succulent longer in the moist protective atmosphere. 2.2 MW frequency controlled refrigeration capacity, condenser fans, units cooler fans and refrigerant pumps run throughout the year on demand and cover particularly partload operation. Carota Sp. z o.o. is well prepared for doing business in Europe thanks to its new production and storage technology. The demand for carrots and onions from Lower Silesia has also grown in the course of last year. Over the middle term, the cooperative reckons with a market quantity of 25,000 to 30,000 tons of vegetables per year.

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