FEATURE REPORT PRODUCT NEWS
Bitzer
The AMChill packaged chiller, developed by natural refrigeration specialist KGM Refrigeration with support from Bitzer UK, runs on an ultra-low charge of ammonia, made possible by a new design that overcomes the need for a fl ooded evaporator.
Based on open-drive Bitzer W-series compressors optimised for use with ammonia, the chiller is designed for roof-top mounting without the need for expensive risk mitigation measures, such as high-capacity exhaust ventilation, required in plant room applications. The chiller’s light weight and compact dimensions (1m wide by 1.6m long and 1.9m high) enable it to be easily transported onto rooftops without the use of a crane via a standard lift, saving installation time and cost. Charge reduction is key to the chiller’s innovative design. Flooded
evaporators on conventional ammonia chillers require a large reservoir of liquid ammonia. The new chiller works with very low superheat, coupled with minimised pipework, reduces the ammonia charge by around 75%. In addition to the roof-top mounted design, safety is further enhanced by the use of integrated ATEX-rated leak detection with system shutdown, and an ATEX-rated fan for enclosure ventilation. The chiller is available in three sizes, spanning capacities from 100kW to 150kW (based on an outlet temperature of +6°C). One of the keys to the chiller’s outstanding effi ciency is the use of a variable speed drive linked to a synchronous reluctance IE5 motor. Linked to Bitzer’s open-drive reciprocating compressor, it can modulate speed and enable output to be precisely matched to cooling load across a broad range of conditions. This delivers a signifi cant improvement in energy effi ciency performance against conventional chillers running on synthetic refrigerants. For example, for a cooling output of 150kW at a typical duty point (+12°C/+6°C evaporator and +30°C/+35°C on the condenser), the AMChill chiller has a COP/EER of 5.43 compared with 4.95 for a similar unit running on R-513a, an improvement of around 10%. The Bitzer compressors at the heart of the system are supported
by Bitzer AWA valves and high-performance coalescing oil separator to minimise oil carry over.
www.bitzer.de/gb/en/
Williams
Williams’ Meat Wells are designed to give users fast access to frozen meats, in a compact and highly effi cient unit. The Meat Wells are aimed at QSRs, butchers shops and any food business that needs to be able to store frozen meats, such as joints, burgers or chops, within easy reach. There are two versions of the Meat Well, both are 634mm deep
by 903mm high, while the MWF600 is 608mm wide and the larger MWF900 has a width of 908mm. Despite their compact dimensions, they off er generous storage capacities of 160 and 237 litres respectively. Their size means that the Meat Wells will suit even the smallest kitchens or shops looking for extra freezer storage. The Meat Wells have a removable sliding lid, so the frozen meat is easy to access and restocking is quick and simple. Nylon coated wire dividers help organise storage and the lid is lockable for security.
The Meat Wells feature the Williams CoolSmart controller, which manages the refrigeration system. Their precision-injected, high density foam insulation provides excellent thermal effi ciency and, like the natural hydrocarbon refrigerant they use, has low GWP and zero ODP.
The Meat Wells are robustly constructed with both exterior and interior made of a hygienic stainless steel. They are engineered to operate effi ciently in ambient temperatures up to 32°C. Williams Refrigeration off ers a comprehensive range of
commercial refrigeration including gastronorm cabinets and counters, specialist bakery equipment, coldrooms, multidecks and blast chillers.
www.williams-refrigeration.co.uk
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www.acr-news.com • February 2024 35
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