BSEE
COVER STORY
New NHS Nightingale Hospital in Exeter gets Toshiba Heat Recovery VRF System
Higheciency Toshiba variable refrigerant flow (VRF) air condioning – supported by some 5km of electrical cabling – has been installed as part of a fasttrack project for the new NHS Nighngale Hospital at Exeter.
Carrier AquaSnap AirCooled Chiller Range Now
Available on R32
The innovative air-cooled range meets requirements for the European F-Gas phase-down of HFC refrigerants and Ecodesign requirements for 2021.
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Carrier selected R-32 refrigerant, which has a low global warming potential (GWP) of 675, for use in commercial scroll chiller ranges. R-32 has a GWP that is one third less than the GWP of the current R-410A version and this change, combined with a significant system refrigerant charge reduction – up to 30%, allows for an exceptional 80% reduction in direct greenhouse gas emissions. The AquaSnap range reaches an outstanding Seasonal Energy Efficiency Ratio (SEER12/7) of up to 5.33 and a Seasonal Coefficient of Performance (SCOP) of up to 3.77. The range covers capacities from 40 kW to 940 kW.
“Carrier’s AquaSnap range with R-32 refrigerant allows our customers to anticipate compliance to Ecodesign 2021 requirements while supporting the next phase down steps of the European F-Gas regulation for HFC,” said Didier Genois, Vice President, Carrier HVAC- Commercial, Europe. “The range also provides customers with best-in-class performance in heating and cooling conditions.” The AquaSnap with R-32 refrigerant can meet the needs of a wide scope of applications. The range covers an extended operating map, up to 48 degrees Celsius outdoor air temperature, and features Carrier’s best-in class technologies for maximum efficiency in all conditions, including: • Multiple scroll compressors able to match load requirements. • Brazed asymmetric plate heat exchangers with true dual-circuit design for high performance in both full- and partial-load conditions.
• Smart energy monitoring function providing real time capacity provided and energy consumption measurement.
• Greenspeed® intelligence on premium versions: variable-speed fans and variable-speed pumps.
To learn more about Carrier offerings, visit
www.carrier.com.
arrier’s AquaSnap® scroll chiller range is now available with R-32 refrigerant, which improves performance and reduces direct greenhouse gas emissions by up to 80%, compared to the previous range using R-410A refrigerant.
he 116-bed facility, operated by the Royal Devon and Exeter NHS Foundation Trust, is part of the UK’s network of seven Nightingale Hospitals designed to treat patients with coronavirus, and remains on standby in case extra capacity is needed for patients with COVID-19.
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The air conditioning project was designed and installed in seven weeks, and includes 46 Toshiba Super Heat Recovery Multi (SHRM-e) air conditioning systems linked to the manufacturer’s high capacity 14kW cassette indoor units. The system serves hospital wards, testing facilities, meeting rooms and clinical support areas. A high performance Toshiba split system also cools the hospital’s server room.
“It is a substantial project and involved high heat gains due to the intensive care medical equipment used on wards. It required careful planning due to the complexities of the site and the critical healthcare application,” said Gary Tidball, who headed the design and installation project for Mechanical and Electrical contractor TClarke. “We selected Toshiba because of its reliability and the company’s large capacity cassettes, which enable a high density of cooling with minimal intrusion of indoor units into the space.
“The support we received from Toshiba throughout the project was outstanding. Seven- day-a-week working was required to meet the project timetable, and early on in the project, Toshiba’s regional sales manager Wayne Dolley himself delivered units to site over a weekend to ensure work could progress.”
Toshiba’s large capacity ceilingsuspended cassees provide an ideal soluon as they pack a lot of cooling into a small space.
To optimise air circulation and cooling, TClarke converted the 4-way cassettes to two-way units, augmenting lateral coverage along the length of wards. Closing off two side-outlets in this way delivers increased cooling and air-throw to the remaining open louvres.
Toshiba’s SHRM-e three-pipe heat recovery VRF air conditioning system sets an industry benchmark for energy efficiency performance and continuous heating, achieving a world-first European Seasonal Energy Efficiency Ratio (ESEER) of 8 in most capacities.
The system uses an advanced rotary compressor, developed and manufactured by Toshiba, which uses a two-stage compression process for improved efficiency and performance. Wear surfaces on compression vanes are treated with a high-tech Diamond-Like Carbon (DLC) coating, giving outstanding hardness, wear resistance and reliability. This enables a significant increase in compressor rotation speed, resulting in a higher displacement volume – up to 50% greater than for the previous generation of VRF systems, delivering a higher duty from a smaller compressor, with less power.
The Toshiba VRF project involves 5km of electrical cabling. About Toshiba Carrier UK
Toshiba Carrier UK Ltd is a joint venture between Toshiba Carrier Corporation and Carrier in the United Kingdom, and provides sustainable solutions integrating energy efficient products for residential and light commercial customers. Toshiba Carrier UK and its subsidiary companies are a part of Carrier, a leading global provider of innovative HVAC, refrigeration, fire, security and building automation technologies. For more information, visit
http://www.toshiba-aircon.co.uk
14 BUILDING SERVICES & ENVIRONMENTAL ENGINEER OCTOBER 2020
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