ELECTRICAL SYSTEMS
As well as a UPS solution, a Medical IT, or Medical Isolated Power Supply system, will be required for operating theatres, intensive care rooms, MRI suites, recovery rooms, and therapy rooms, where isolated power is needed.
power efficiency, as well as other benefits, including high availability and scalability. However, many sites have older legacy UPS systems – and these are where flexibility and energy reduction opportunities can mainly be found when systems are being reviewed and updated. Traditionally, UPS design centred on large individual standalone machines, which had to cover all the capacity required. Therefore, the whole system was always powered, and frequently would not be operating in its most efficient load band.
If redundancy was required, a complete additional system would be needed, further increasing the risk of sub-optimal loading. While a legacy UPS system may have a maximum efficiency of 93%, at 50% load this may fall to 90%, and to much lower – at 25% of maximum rated load.
Redundant capacity built in Today’s designs are modular, where we can calculate and manage the load, so there is always redundant capacity for spikes in power usage. The UPS capacity
Case study: Kohler at the heart of Nottingham cardiac centre
Nottingham University Hospitals NHS Trust is home to a two-floor cardiac centre providing planned and emergency care, including operating theatres and dedicated intensive care units. The Trust has been a customer of Kohler Uninterruptible Power’s for some time, with an original system of two KOHLER PW6000 160 kVA UPS systems in parallel: “Kohler Uninterruptible Power was proactive in contacting the Trust to advise that its units were coming to their end-of- life expectancy, which started off the conversation on a replacement system,” the Trust’s Estates Operations officer explains. With the Trust a loyal customer,
KUP put forward a variety of solutions that would suit the new requirements; this included a smaller capacity load, modular, and standalone systems.
62 Health Estate Journal February 2024
“After reviewing all viable options, we decided it would be best to replace the units like for like, but with a different UPS,” the Estates Operations officer explained. “The system was installed into the existing electric infrastructure, and configured to batteries on site, as they were relatively new. We continue to use KUP for the team’s exceptional service and trustworthy advice.”
Training Kohler offers a series of CIBSE (Chartered Institution of Building Services Engineers)- accredited CPD options, including its new Healthcare-focused Training Academy, developed for healthcare estate engineers or design engineers who work with critical power within healthcare environments. Designed to explain the principal design aspects of uninterruptible power supplies (UPS) and secondary supplies discussed
originally provided needs only to exceed the actual load slightly, because it can be increased so easily, and incrementally, as and when the load grows. For example, users can start with a single cabinet with one 100 kW module (referred to as N), and have one more module included for redundancy (referred to as N+1). As the load grows, the UPS can be vertically or horizontally scaled (depending on the model) by adding additional modules, until the cabinet is up to its full kW capacity, and then additional cabinets as required. The ability to continuously ‘right- size’ the UPS capacity to the load lets users minimise their power and cooling requirement, which consequently reduces power usage over the life of the UPS. Additionally, when we look at the load/ efficiency curves for modern, modular systems, we can see they are not entirely flat, but instead produce slightly higher efficiency at partial loads. This is because UPS manufacturers recognise that modular systems are typically operated in ‘redundant mode’, so no single module will be fully loaded. For example, in an N+1 system comprising two modules in parallel and sharing the load equally, neither will ever have more than 50% loading. The overall energy savings, over several years, from migrating to a modular UPS system from a poorly used legacy installation can be quite considerable.
Other equipment considerations
Medical Isolated Power Supply (MIPS) As well as a UPS solution, a Medical IT, or Medical Isolated Power Supply system,
in HTM 06-01 guidance, Kohler’s new academy course looks at how the HTM 06-01 guidance integrates a UPS into the electrical infrastructure, to enable the design of a reliable and resilient system in a hospital other medical facility. For groups of 12-14, Kohler will arrange to visit an NHS Trust to provide the training on its site.
Continuing Professional Development Ideal for consultants and electrical engineers, Kohler Uninterruptible Power offers free technical seminars to keep attendees up to date with the latest power protection specification and selection requirements, and the latest technology.
New White Paper available The company said: “Download our new, free resource for more advice on shoring up your critical power and backup solutions in healthcare.” Visit:
www.kohler-ups.co.uk/critical- power-care-for-patient-safety
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