|
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.
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|
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. |
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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 |
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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. |
Contact:
SSP Kälteplaner AG
Beat Schmutz
Bifangweg 30
CH-4702 Oensingen
Switzerland
Phone: +41 62 388 03 50
Fax: +41 62 388 03 59
Mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
www.kaelteplaner.ch
Johnson Controls Systems & Service GmbH
Ralf Zimmermann
Gottlieb-Daimler-Str. 6
D-68165 Mannheim
Germany
Phone: +49 (0)621 468 620
Fax: +49 (0)621 468 245
Mail:This email address is being protected from spambots. You need JavaScript enabled to view it.
ww.jci.com