Project: Lekkerland / Germany


Planning / Implementation / Main components SSP Kälteplaner AG / Johnson Controls Systems & Service GmbH
Refrigerant Ammonia (NH3), carbon dioxide (CO2)
System start-up November 2008

Lekkerland is a wholesale company for food, beverages, tobacco, telecommunication and other non-food products. The wholesaler has installed deep-freeze warehouses and refrigerated storage facilities at all three German sites in Oberhausen, Stapelfeld and Allershausen. In spite of the higher investment costs involved, Lekkerland has opted for ammonia and carbon dioxide as natural refrigerants.

Demands The objective was to ensure environment-friendly refrigeration on the basis of a comprehensive concept for the three deep-freeze warehouses and refrigerated storage facilities using the same technical systems.
Solution SSP Kälteplaner has planned an installation working with the natural refrigerant ammonia for normal refrigeration and carbon dioxide for deep-freeze refrigeration. The ammonia gases compressed by two screw compressors are condensed with air-cooled condensers. A secondary refrigerant system is used for the refrigerated storage facilities, operating with a water/glycol mixture at a flow temperature of -8°C. The refrigerated stores are cooled to 0°C and the loading zones to 5°C. Frequency converters are fitted to the screw compressors of the ammonia system.
Technical data:


Type of facility Cascade system
Refrigerant NH3, CO2
Refrigerant volume approx. 400 kg NH3, approx. 350 kg CO2

Secondary refrigerant

Water/glycol mixture
Refrigerating capacity Stapelfeld & Oberhausen: Deep-freeze refrigeration: 210 kW Normal refrigeration: 600 kW Allershausen: Deep-freeze refrigeration: 165 kW Normal refrigeration: 600 kW
Main components: 2 screw compressors (NH3 speed-controlled), 2 piston compressors (CO2), no-frost refrigerator, evaporator in deep-freeze warehouse with defrost flaps
Special features / Comments: The glycol no-frost refrigerators are defrosted with power pack defrost stations which heat the secondary refrigerant. The waste heat from the oil coolers is used for heating.

SSP Kälteplaner AG
Beat Schmutz
Bifangweg 30
CH-4702 Oensingen

Phone: +41 62 388 03 50
Fax: +41 62 388 03 59

Johnson Controls Systems & Service GmbH
Ralf Zimmermann
Gottlieb-Daimler-Str. 6
D-68165 Mannheim

Phone: +49 (0)621 468 620
Fax: +49 (0)621 468 245