Case study
Poultry producer
3-stage ammonia refrigeration plant with a glycol cycle
Key information
Client:
Poultry producer (anonymous)
Supplier:
Kältetechnik Dresen + Bremen GmbH
Type of facility:
Three-stage ammonia plant
System start-up:
2005
A leading poultry producer required an economical and environmentally friendly refrigeration plant for processing its products. Kältetechnik Dresen + Bremen, a German builder of refrigeration plants, installed this particular ammonia plant.
Requirements
The new production facilities, with a total floor space of approx. 5,000 m², were to be equipped with a number of different refrigeration and processing rooms. The spectrum of required temperatures extended from -30°C to 7°C.
Solution
Kältetechnik Dresen + Bremen built a three-stage ammonia refrigeration plant with a glycol cycle. Four screw compressors and one piston compressor were used to control the various temperature level requirements of the system, which was charged with 2,850 kg of ammonia. The deep-freeze warehouse and the shock-freeze rooms with a refrigeration output of 410 kW at -40°C are directly supplied with ammonia. An ethylene glycol cycle with a flow temperature of -12°C cools the production rooms, e.g. filleting, fresh storage and packaging rooms, and an integrated ventilation system with a total refrigeration output of 2,190 kW. In a spray humidified chilling tunnel that is also linked into the cycle, roughly 9,000 chickens per hour are cooled down to a temperature of 2°C.
Technical data
Cooling capacity:
2,190 kW
Refrigerant volume:
2,850 kg
Secondary refrigerant:
Ammonia/ethylene glycol
Main components:
Screw compressors, piston compressors, air coolers
Special features:
One special feature of this refrigeration plant is mist humidification, to prevent loss in product weight, and a sliding temperature scale that takes its cue from the product temperature. The production rooms are kept at 4°C by air coolers operated in conjunction with a ventilation system. After wet-cleaning, the production rooms can be dehumidified and dried in a very short time at a constant temperature thanks to “intensive humidification” via the custom-built air coolers.
