Cold stores are a vital link in the cold food chain. The modern world, as we know it, is dependent on fresh or refrigerated foodstuffs. The cold food chain is an integral part of our daily life. The responsibility of the cold store for the smooth functioning of the cold food chain logistics process is huge. Produce must be stored reliably and with accurate temperature control. The energy costs of cold stores are significant, so any technical advances that can be made will have economic as well as ecological benefits. The huge reduction in refrigerant charge, the stable temperature control and practically maintenance-free running of such a system make secondary systems an economically viable option in terms of total cost of ownership.