Star’s Azanefreezer 2.0 exceeds UK performance guidelines

By Andrew Williams, May 06, 2019, 15:45 3 minute reading

updated at: May 15, 2019, 12:12

New data shows that Star Refrigeration’s Azanefreezer 2.0 breaks UK best-practice performance guidelines with estimated cost savings of 66%.

Star Refrigeration's Azanefreezer 2.0.

Star Refrigeration’s Azanefreezer 2.0, an industrial freezer using natural refrigerant ammonia at low charges, is delivering energy cost savings of up to 66% vs. UK benchmark figures.

The Azanefreezer 2.0 is a new iteration of Star’s air-cooled industrial freezer package designed for cold storage and food processing applications, such as blast and spiral freezing. It can be charged with as little as 0.52 kg/kW of ammonia.

Average energy consumption figures for chilled and frozen storage facilities across Europe are about 50% higher than the figure declared to be best practice by the UK government, according to research conducted by Prof. Judith Evans et al. for the International Institute of Refrigeration ('Specific Energy Consumption Values for Various Refrigerated Food Cold Stores, Proceedings of the 24th IIR Congress, Yokohama, IIF/IIR').

Recent energy performance data analysis for the Azanefreezer 2.0 indicates that its annual energy usage is one third that of the UK’s best-practice guidelines – hence the 66% saving.

“We’re really excited about the launch of Azanefreezer 2.0, because the stunning improvement in energy consumption sets a new benchmark landscape for freezer performance,” said Rob Lamb, group sales and marketing director at Star Refrigeration.

“As a pre-packaged low-charge ammonia freezer, the Azanefreezer 2.0 is completely unique in the industry,” Lamb said.

The Azanefreezer 2.0 is available in capacities of up to 650 kW and delivers temperatures down to -40°C. Multiple units can be used for larger capacity installations.

It uses on-board PLC hardware and software to deliver optimised system efficiency including compressor sequencing and condenser and evaporator EC fan speed control.

In designing the new Azanefreezer, Star listened to customer concerns about energy bills, with some temperature-controlled storage business reporting 30% price hikes in the past year.

“Many businesses are witnessing how the costs of their energy bills outweigh the costs of their workforce,” Astrid Prado, marketing mangager at Star Refrigeration, told

“Large users of refrigeration are primarily focusing on cutting energy consumption and carbon footprint, both long-term issues which tie in with climate change targets and environmental sustainability,” Prado said.

Companies are making long-term investments – over 20 years – which required energy efficient, future-proof solutions such as the Azanefreezer." 
– Astrid Prado, Star Refrigeration

Renewed investment in warehouses

Star reports that more investment in new warehouses, particularly from multinational companies seeking to increase their presence in the UK, is also driving interest in the Azanefreezer 2.0.

“These companies are making long-term investments – over 20 years – which required energy efficient, future-proof solutions such as the Azanefreezer,” Prado said.

The Azanefreezer 2.0 capitalises on the variable VI capability of the compressor by using an air-cooled condenser and allowing the discharge pressure to drop extremely low in cold weather, thus improving the seasonal efficiency of the system. Star’s patented 4-way valve also delivers a reverse-cycle defrost, using less energy than electric or hot gas systems.

According to Star, the low-charge ammonia design of the Azanefreezer 2.0 reduces refrigerant charge by up to 96% compared to traditional ammonia systems and avoids the need for complex valve stations. This removes the requirement for leak detection and ventilation, minimising health and safety concerns.

By Andrew Williams

May 06, 2019, 15:45

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