GREEN MATTERS
less than 200 amperes to meet the distribution restrictions of the buildings power supply and a footprint no wider than 2.3m to allow for service space within the dedicated plant compound.
After searching for possible products, the Turboline range of liquid chillers from Clint offered a solution. The flexible configuration of the Clint Turboline allowed low starting currents and high efficiency using Danfoss Turbocor compressors, along with the ultra- low GWP refrigerant option of HFO R1234ze. All this fitting in chassis of 2.2m wide. Fujitsu partner GI Holdings, based in Northern Italy, focuses on developing environmentally friendly design options throughout the businesses that it has within its group. Clint is one of those businesses and specialises in chiller applications with low GWP refrigerant alternatives.
Turbocor compressors have been developed to provide very high efficiency gains compared to alternative centrifugal or screw variations because of their two-stage compression and friction-free magnetic bearings. The two-stage compression increases volumetric
efficiency, meaning a higher capacity to power input ratio. The magnetic compressor shaft bearings overcome losses suffered by friction encountered in physical bearings and reduce wear and tear. Inverter control using variable speed drives regulates the frequency and voltage of the power supplied to the compressor. This means that that the shaft rotational speed is slow initially, consuming less energy and then seamlessly regulated to the desired speed depending on the required capacity.
The benefits The Turboline range of liquid chillers is available with three variations of refrigerant: R134a, R513A and R1234ze. The HFO R1234ze is an ultra-low global warming potential refrigerant with a GWP of less than one and zero ozone depletion. This makes it comparable to naturally occurring refrigerants such as CO2
. It is an A2L refrigerant and so
has low flammability and is non-toxic. The opportunity to select from various refrigerants allows corporate responsibility requests from the customer to be met.
The existing chiller was decommissioned and 82kg of R407C refrigerant recycled equivalent to 146.5 tonnes of CO2 equivalent. By using R1234ze, the reduction of equivalent tonnes of CO2 is 345.5 tonnes compared with the existing chiller and 126.1 tonnes in comparison to the alternative option of R513A. In addition to the environmental gains, improved efficiency results in a comparative operating cost reduction of £10,300 per year in favour of the Clint Turboline system compared to the existing chiller. Following installer training and commissioning from Fujitsu, a remote monitoring system was installed, which can be used to identify changing trends in operation, highlighting service requirements and allow optimisation of system efficiency across its life cycle.
It was a challenge to find a solution that met all the criteria of the full specification. However, the flexibility of design and the wide range of configurations available from Clint meant that we were able design a system delivering both what the client requested and what the building required.
TEV
www.acr-news.com
June 2021 35
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