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COMMERCIAL COMPRESSORS


80%–85% by 2047. This comes at a critical juncture, as large developing nations such as India and China will likely add tens of millions of air conditioning units in the coming decades. So where does this leave the refrigeration industry? There is no universal replacement for HFC refrigerants as of now, and the industry at large is in a state of flux, working toward more sustainable solutions. While new technologies and synthetic alternatives are sought, natural refrigerants such as ammonia, CO2


and


hydrocarbons are already being used with some success.


Aside from the mandated changes in the Montreal Protocols, manufacturers have taken the move to sustainability to heart. The idea that corporations can be and should be responsible environmental actors resonates strongly with a new generation of consumers.


Retailers have been instrumental in this push as they look for ways to be more environmentally engaged. While recycling, LED lighting, heat recovery, and solar are all becoming more commonplace, it is the refrigeration systems used that could potentially have the greatest impact. As demand for environmentally conscious refrigeration grows, customers need a compressor


manufacturer with vision and unparalleled technical expertise. While CO2


has emerged as


a promising alternative refrigerant, the high pressures involved present some significant technical challenges.


When Rivacold, Alfa Projekt and the installer ADM got together to collaborate on a CO2


for a 1500m2 system


supermarket, they knew they would need a compressor manufacturer they could count on. This was going to be a complex transcritical system with multiple compression stages providing air conditioning and heat recovery. Since this unit would be running 24 hours a day in a residential area, it had to be quiet, efficient and reliable.


In the end, Frascold was chosen to provide the heart of this system. With a wide range of subcritical and transcritical CO2


compressors,


Frascold was uniquely suited for this project. The completed unit is a CO2


transcritical


booster system with parallel compression including air conditioning and heat recovery providing: ■ Refrigeration capacity of 90kW at Medium temperature (-8°C)


■ Refrigeration capacity of 18kW at Low Temperature (-35°C).


The design called for a total of ten compressors representing three pressure stages: ■ Medium Temperature: Three Frascold S20- 12TK compressors, operating at -8°C, one being driven by Variable Frequency Drive. This is for the supermarket display cabinets holding around 0°C.


■ Low Temperature: Three Frascold A1.5-3SK3 compressors, operating at a high standstill pressure of 80bar and -35°C. One of these is also driven by VFD. This provides cooling for the frozen foods showcase.


■ Parallel compression: Four S20-12TK compressors dedicated to air conditioning and flash gas.


Since rolling out on 01 August, feedback has been overwhelmingly positive. Technicians from both the design company and ADM, who installed the system, report the compressors running extremely smooth and with very little noise. Being a retail space, noise level is as important as cooling performance.


The success of projects of this type points to a future of cleaner, more environmentally conscious refrigeration.


Recent project Liberty Leisure Centre. 500kW Midea VRF System libertyleisure.com (Wychbold)


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  


MIDEA See midea.com Call Our Team: 03300 200003 www.acr-news.com Email Us: Sales@vrfcentre.com


 


November 2017 29


Air Con Centre *Subject to Terms & Conditions


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