Products - Star Refrigeration

Envifreeze Envichill Envicold Envichiller

  • Multiple semi-hermetic reciprocating compressors for enhanced resilience
  • Low pressure receiver; delivering enhanced efficiency via semi-flooded evaporator operation
  • Welded steel pack pipe work
  • High quality, industrial grade components throughout
  • Fully automated oil management system
  • Integrated control panel with optimised PLC controls and touch screen interface
  • Dual pressure relief valves
  • Energy meters
  • Designed and manufactured in the UK

Refrigerant type

Envifreeze Envichill Envicold Envichiller

  • Future-proof solution which is not covered by the F-gas Regulation
  • 100% environmentally responsible natural refrigerant
  • A1 refrigerant safety rating; CO2 is non-flammable with low toxicity
  • Eliminates the need for water, effluent and compliance with L8 legislation through use of an air cooled gas cooler
  • Minimal site installation requirements with the skid mounted arrangement
  • Optional weatherproof housing allows the system to be situated internally or externally, maximising flexibility and negating the need for a dedicated plant room
  • Robust industrial design, with over 20 years life expectancy
  • Attractive system energy performance
  • Redundancy via multi compressor design
  • Packaged arrangement for straightforward site installation
  • Designed for ease of maintenance
  • Save energy with the option for heat recovery


CO2 Solutions Case Studies

  • BrewDog

    Star Refrigeration installs future-proof CO2 Refrigeration solution for first fully-refrigerated beer warehouse in Europe

    Star Refrigeration successfully delivered an eco-friendly CO2 refrigeration solution for a new cold storage and distribution centre at BrewDog’s recently purchased Eurocentral warehouse in Motherwell, Scotland. Star were awarded the contract after presenting the energy efficient, cost effective cooling solution to BrewDog amongst a range of bidders.

    BrewDog is a multinational craft beer company founded in Aberdeenshire in 2007. As one of the fastest growing beverage brands in the world, the Scottish brewer is constantly expanding and required a refrigerated space to store and chill their evolving range of boldly flavoured craft beers, from which to distribute to supermarkets, stores, pubs and outlets across the world. With that ambition in mind, the company purchased an 80,000m3 warehouse at the Eurocentral complex which offers unrivalled access to Scotland’s central road network.

    Having acquired the new warehouse to use as a distribution centre, BrewDog commissioned Star to deliver a brand-new plant capable of chilling to +5oC at a price that was cost-effective for the company. BrewDog also specified the use of natural refrigerants to avoid harmful F-gas solutions, thus safeguarding the site against future regulations and enhancing its overall safety and environmental credentials.

    Star was responsible for every aspect of the plant’s development from the design and supply, through to installation and commissioning. Given the proximity of Star’s branch in Bellshill just five miles away, the company was uniquely positioned to rapidly respond to BrewDog’s requirements and queries at all times.

    BrewDog are already familiar with Star Refrigeration after the company enlisted the help of Star Technical Solutions (STS) back in 2017. Star consultants determined the brewery’s current refrigeration load and spare capacity ahead of increasing production with the construction of a new £20m brewery in Ellon.  Euan Duncan, Technical sales engineer at Star Refrigeration, said, “We’re delighted to be working with BrewDog once again. Through the successful delivery of Europe’s first fully refrigerated beer warehouse, we’ve demonstrated how Star are committed to pushing the boundaries of what is possible in the refrigeration industry and helping our customers take their business to the next level.”

    The CO2 Refrigeration Solution

    Star’s proposal was based on the use of a direct expansion CO2 refrigeration system in conjunction with six off-air coolers within the chamber. The CO2 plant is designed for a duty of 480KW based upon a chamber temperature of +50C and a design ambient temperature of +300C.

    The CO2 refrigeration package is a standalone system located on the exterior of the building and connected to the coolers via pipework. It includes reciprocating compressors, an air-cooled gas cooler with variable speed fans, an interstage vessel, subcooler and electrical panel with PLC controller. Liquid CO2 from the package is supplied to coolers within the warehouse where it evaporates, removing the heat from the room, before returning to the pack as vapour. The use of CO2 means that smaller pipework can be used to distribute cooler around the facility, helping to save installation and steelwork costs.

    The pipework was fully insulated to Star’s standard specifications and feeds each of the six air coolers, which are controlled by a panel located in the adjacent ambient area. The air cooler casework has a galvanised steel finish and honeycomb air straighteners have been designed with a five degrees angle upwards, to achieve the necessary air throw and make full use of the beneficial attributes of the Vortex building.

    The advantages

    CO2 was deemed safer and more cost effective at this particular site and application. It is already present in our atmosphere and it is futureproofed against the f-gas environmental legislation. Also, itdoes not carry the hazards linked to other refrigerants such as ammonia and can directly cool the building without the addition of a secondary fluid such as glycol, which would have required a lower evaporating temperature, thus reducing efficiency.

    The reduced dimensions of the equipment involved and the lightweight nature of the coolers and pipework meant that the CO2 plant was significantly lighter and less intrusive than alternative solutions. Given the building’s structural restrictions, the limited weight impact proved to be a key USP in the eyes of BrewDog.

    Overall, Star’s solution translated into financial savings as the chosen setup resulted in a price per watt of just one pound, or around a 30% cost reduction in comparison to a traditional ammonia glycol system.

    The Outcome

    The successful design, supply, installation and commissioning of the plant offers BrewDog the capability to take full control of their beer’s temperature controlled storage and distribution, allowing them to service the craft beer industry in a manner not currently being offered by their rivals. With the plant now able to maintain optimum temperatures within the distribution centre, BrewDog’s craft beer will be delivered to the consumer without losing quality or flavour.

    Niall Murphie, Engineering Manager at BrewDog, said, “Star Refrigeration delivered an energy efficient, financially viable and environmental responsible solution. This allow us to remain uniquely placed to serve the needs of beer lovers all over the country and beyond, helping to spread our passion for craft beer to every corner of the globe”.









  • Asda CO2 Cascade Plant

    Star Refrigeration has completed another innovative cooling plant installation for supermarket giant ASDA, at one of its network of UK distribution centres.

    Star has installed an energy efficient refrigeration plant at ASDA’s Central Distribution Centre in Lutterworth, near Leicester. The project is the latest cutting edge cooling solution designed by Star to ensure the efficiency of ASDA’s frozen and chilled operation.

    Star has partnered ASDA on a wide range of distribution centre projects since 1988, including a number of environmental award winning refrigeration systems. In 2006, ASDA was looking for a new refrigeration system to replace an existing R22 plant and meet increased operational demands at its 24/7 Lutterworth facility.

    Cooling solutions specialist Star was commissioned by ASDA in a contract valued at over £3million. The 10-month project formed part of a major refurbishment and extension to the chilled facility at Lutterworth. Star worked closely with ASDA and the building contractor to ensure the site remained fully operational and that the installation was completed on time and to budget.

    Star’s cooling solution for the Lutterworth site comprised an ammonia and carbon dioxide (CO2) cascade plant. The refrigeration plant is highly energy efficient, reliable and robust by design to meet ASDA’s key objectives. The system operates on natural refrigerants and avoids the use of ammonia in populated work areas.

    The cascade plant provides cooling to four main refrigerated chambers within the storage and distribution facility. The site has a frozen food cold store operating at -25°C and three large chill rooms, operating from +1°C to +13°C. 

    The new refrigeration plant is located in a purpose built Energy Centre adjacent to the main building. The system has an overall cooling capacity of 3.2MW and serves a total internal volume of around 270,000 cubic metres. Star’s patented TELSTAR computerised control system ensures optimum performance and efficiency.

    Star Refrigeration Sales Director Rob Lamb says: "Following the success of similar refrigeration plants for ASDA, this was naturally the best solution for the Lutterworth distribution centre. The ammonia and CO2 cascade system combines the very latest in design innovation with natural refrigerant technology."

    He adds: "The cascade plant’s refrigerant charge is predominantly CO2, with an ammonia charge of less than one tonne. Star has now completed the installation of this type of energy efficient and environmentally conscious refrigeration system for ASDA at four UK sites."

    The cascade plant operates with ammonia refrigerant in the high temperature stage and CO2 in the low temperature stage. CO2 is used as the low temperature fluid in a standard vapour compression cycle, rejecting its heat to the ammonia system. CO2 is then used as a high temperature volatile secondary refrigerant for chill areas and general air conditioning.

    The low stage CO2 plant has a cooling capacity of 820kW. It supplies low temperature liquid CO2 to six air coolers in the cold store. The high stage ammonia plant operates with a minimal charge. The plant serves 20 air coolers in 3 chill areas and has a capacity of 2.4MW.

    Star Refrigeration is the UK’s largest independent industrial refrigeration engineering company. Star focuses on the design, manufacture, installation, commissioning and maintenance of industrial refrigeration systems. The company offers a turnkey package to all users of refrigeration plant.