Energy Savings

Should water tanks be a compulsory feature at all cold stores and warehouses? – Lutz Refrigeration responds

Rain water storage systems to supply evaporative cooling towers here in South Africa We are proud to say that Lutz Refrigeration in collaboration with Barpro will be pioneering the use of rain water harvesting to supply the fridge plant at Southern Cold Storage’s new freezer rental storage facilities in Germiston Johannesburg. The multiplex system will be cooling the 20 000m³ freezer room down to -25°C.  Opting for evaporative cooling with Freon is very much against the grain, but by doing this we managed to keep the capital costs in a standard Freon league while competing neck and neck with Ammonia plants on energy efficiency. Initially we will be installing 20m³ of water storage facilities which will offer two days of standby water capacity and will require a 20mm rainfall to be topped up.  Judging from historical rain falls and a bit of field testing we will probably increase that to around 40m³ once the system is up and running. The freezer store rooms are scheduled for commissioning during November this year, we will follow up with photos and feedback once the system is up and running. For more information contact Kevin Walter by email: kevinw@lutzrefrigeration.co.za

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Visit to Montagues New Cold Store at Truganina outside Melbourne, Australia

Montague Cold Storage has been in business for over sixty years. Family owned, Montague’s started life as a supplier of fruit and flowers before becoming one of the largest cold store operators in the states of Victoria and Tasmania with over 140,000 pallet spaces available. Phase 1 of Montague’s new Truganina store was commissioned at the end of 2014 and has a capacity of 30,000 pallet spaces. I was delighted to be shown around the facility by the Facilities Director, Glenn Edwards.   LOADING AREA                                                                                     LOADING DOCKS The loading docks at Truganina have been designed for maximum efficiency and in line with Health and Safety legislation. After entering the site through a special entrance, the trucks wait at a marshaling point until directed to a particular loading bay. Backing up to the loading bay is assisted by ground guides which make sure that the rear of the truck is correctly placed. Then the trailer’s rear protection bar is locked in position. Until the lock is in place, the internal loading bay door will not open nor can the dock leveler be activated. The lock prevents the truck from moving away from the loading dock with a forklift inside. The driver then enters vestibule of the loading dock through the door and opens the truck doors. The air seals activate to prevent the ingress of warm moist air, the dock leveler is put into position and the internal door opens. While waiting for the truck to be loaded/offloaded, the driver has access to bathroom facilities and a canteen. He is observed by the cold store staff as they must sign off that he is fit to drive the truck to its next destination. As his load is processed, the driver stands on an observation platform in the loading dock to check the pallets. When the doors are sealed and the paperwork completed, the lock is released and the truck leaves via a gate that only opens when the cold store staff have checked that everything is in order.                                                                                                                                                                               FREEZER ROOMS The freezer rooms are constructed from PIR panels. The local fire authority required that the freezer ceilings be fitted with sprinklers. Had the cold store been placed on the other side of the road, it would have fallen under another fire authority making sprinklers unnecessary. Hitting a sprinkler head will not in itself activate the system. Excessive heat must also be picked up by sensors. The freezer rooms are equipped with double deep racking. Case picking is an important aspect of the business and takes place inside the freezer. Product is supplied to the pick faces via roller beds. Stackers are not allowed in lanes where case picking takes place. Racked picking bays have been made wider than normal to allow for better access to the cases. Space has been created underneath the roller beds to allow room for the picker’s feet. The racking is of high quality and well protected. The upper levels have guides to assist with placing the pallets.                                                                                                                                                                     MATERIALS HANDLING EQUIPMENT Stackers with extendable forks are used to place and retrieve pallets in the double deep racking. Their front wheels must be able to go under the bottom level of pallets. Cases are picked via man on pallet movers. Stand on forklifts are used in the trucks. The stackers have no heated cabs and the fork lifts/pallet movers are all of the stand-up variety. High quality freezer clothing is worn by all cold store employees. The battery bay is well thought out including intelligent chargers which include automatic maintenance of battery water levels. The pallet movers have inbuilt printers and the scanners are attached to the machine with extendable restraints. Every machine has a driver control device, which limits who can drive what, and also sends information regarding impacts to the responsible manager.                                                                                   COLDSTORE CONSTRUCTION FEATURES Some cold store construction features are attached for interest.                                                                                                                                                                                                      

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Consider Sensei for Energy Savings

New Orleans Cold Storage has just signed up with Cascade Energy to maximise energy efficiency in its US based cold stores.  Having listened to NOCS CEO Mark Blanchard give a talk to the Australian Refrigerated Warehousing and Transport Association some years ago about how he had turned his company around after the infamous cyclone, I know he would have checked Cascade’s offering out carefully before making a commitment.  I also know that Michael Bellstedt, an ex South African refrigeration engineer who runs Minus 40 in Sydney is also Cascade Energy’s representative in Australia. He showed me details of the Cascade system “tune up” and Sensei a software platform that allows operators to see how changes in plant operation affect energy usage.  I could understand why Mark Blanchard signed up for them and wondered when they would be available in South Africa. Sensei@minus40.com.au www.minus40.com.au

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