Subscribe to our weekly newsletters
Subscribe to newsletter

 

Editor's Note: UPSL provide:-

UPS systemsUPS systems
Protected powerProtected power
Power systemsPower systems
Energy managementEnergy management
 

Request Information

Home
Include Article
Advertise
 

Links
Request Information
Terms of use
Contact

 

Request Facilities / Interiors product information

Request Architectural product information External

Request Architectural product information Internal

Request Mechanical HVAC product information

Request Electrical product information

 

UNINTERRUPTIBLE POWER SUPPLIES LTD - Are UPS Key To The CRC?

The need for qualifying organisations to reduce their energy usage is highlighted by the Governmentís Carbon Reduction Commitment Energy Efficiency Scheme, or ĎCRCí, which came into effect on April 1st 2010. With the scheme rewarding qualifying participants who perform well, while penalising those who do badly, in both financial and publicity terms, itís clear simply finding ways of reducing energy use is not enough; itís essential that these improvements have long term sustainability. Developments in uninterruptible power supply (UPS) technology offer one way of achieving sustainable energy savings.

Protected power from uninterruptible power supplies (UPSs) is now considered essential by organisations running continuous financial, healthcare or industrial processes that depend on vulnerable ICT equipment. But the UPSs operate at power levels of tens or hundreds of kVA, or possibly more, so any improvement to their efficiency will make an appreciable contribution to their operatorsí energy management strategies.

Such efficiency improvements are possible, through selection of suitable UPS topology and by carefully sizing the UPS system to match its critical load. One increasingly popular approach is to use systems based on advanced modular topology, which allows UPS capacity to be closely matched, or Ďright sizedí, to the critical load size. Modular UPS capacity can easily be incremented or decremented to efficiently match changing load requirements throughout the life of the installation Ė a sustainable efficiency solution.

As well as saving energy and helping to meet CRC targets, modular technology allows significantly smaller, lighter UPS installations with increased power availability. By looking at what modular technology is, we can better understand its benefits and their practical application.

On-line, static double conversion UPSs first appeared in the seventies and are still in use today. Their principle of operation is to rectify incoming AC mains into DC, which charges a battery before being inverted back to AC to drive the UPS critical load. In the event of AC mains failure, the battery can take over the role of supplying DC to feed the inverter until the incoming AC mains is restored. In early designs the inverter was followed by an output transformer, necessary to restore the output AC voltage to the same level as the mains input. However advances in power semiconductor technology and the introduction of the Insulated Gate Bipolar Transistor (IGBT) have allowed changes to the inverter stage design which permit elimination of the output transformer. This yields a number of advantages, the most important of which relate to improved efficiency, and reduced size and weight.

Energy efficiency is improved for a number of reasons. With no transformer core to heat there are no iron losses; with no windings there are no copper losses. Both factors contribute to energy savings. Transformerless designs also exhibit lower input current harmonic distortion (THDi) and an improved input Power Factor, which both reduce wasted energy. Eliminating wasted energy also reduces heating effects, and therefore cooling costs. Further energy savings arise from modular technology which, as we shall see, is made possible by transformerless design.

Eliminating the transformer reduces the UPSís size and weight by something like 66%. This is a large reduction which has had a profound effect on the way UPSs are seen and used. Uninterruptible Power Supplies Ltd (UPSL) realised that a 3-phase UPS rated up to 50 kVA could be implemented as a rackmounting module rather than a large standalone unit. And implementing a UPS as a set of modules in a rack rather than a single standalone unit gives great flexibility as well as space savings. This flexibility allows right sizing, with a UPS solution thatís closely matched to its load. The result is less capital and space wasted on unnecessary capacity together with maximised operating efficiency. An example shows the efficiency savings possible:

Letís imagine a site with a load of 96 kW and a power factor of 0.8, which demands a 120 kVA supply. Weíll also assume that, for security, N+1 redundancy is required. That is, N UPS units have sufficient capacity to completely support the load, so in an N+1 configuration, one unitís failure would still leave sufficient UPS capacity to support the load. This would typically be implemented in a standalone system using two 120 kVA units, each of which would only be 50% loaded during normal operation. Efficiency would be 91%. By contrast, a modular system could be implemented using four 40 kVA modules, where each module is now 75% loaded. As well as being smaller, lighter and more easily expandable, its efficiency would be 96%, which more than halves the cost due to losses per year. The annual cooling costs are also more than halved. At 7.84 p/kWh, total annual savings would amount to over £5000.

If our site load remains at 96 kW throughout its operation life, the annual £5000 savings will continue with no further action needed. In real life however, the load is not only likely to change, but the extent of its change can defy prediction. In a typical scenario a data centre may be expected to be initially loaded to 35% of its capacity, with this load growing steadily to 90% of capacity over a period of 10 years. With a standalone UPS, the response is typically to install a system sized for 90% data centre capacity from the outset, to avoid the difficulties of upgrading or replacing it later. These include finding more floorspace in a crowded data centre, disrupting business operation with building work and installation, and laying or repositioning cabling. However, such an oversized system would spend its operational life greatly under loaded, adding reduced efficiency to unnecessary capital costs and space requirements. This would be exacerbated if the load does not grow to the expected 90%. While the UPSís conservative rating should ensure that the load would always be supported, itís not unknown for the actual load to exceed projections so that new UPS capacity must be supplied after all.

These difficulties can be avoided by using a modular system. Its flexibility means that it can easily be expanded or reduced after being initially rightsized to its load. There is no need to oversize it initially because modules can be added without disruption as and when they are needed. This flexible property of modular UPS topology is known as its scalability, and itís a scalability that has two dimensions Ė vertical scalability and horizontal scalability.

The example above has four 40 kVA modules totalling160 kVA capacity, or 120 kVA with N+1 redundancy. These modules could populate four out of five slots in a single server-style floorstanding rack. Vertical scalability is a reference to the fifth slot, which can be populated to increment capacity at any time. Additionally, a second rack could be provided for an incremental increase in floorspace and cost. The ability to add further racks in parallel is known as horizontal scalability. This adds up to enormous flexibility, with UPS configurations from 10 kVA to over 1 MVA being possible.
The task of efficiently maintaining right sizing to the critical load, however unpredictably the load grows, becomes simple. The modular approach allows the maximum possible energy efficiency as well as minimising capital and space costs throughout the life of the installation.

E-mail Uninterruptible Power Supplies Ltd


Kingspan Access floors Office flooring Floor systems Soundproof flooring News 251010

S and P Coils Heat pumps Radiant panels Air curtains Fan convectors News 251010

Dimplex Electric heating Heat pumps Heat ventilation Heat recovery News 251010

Schneider Energy management Electrical switchgear Automation control Electrical distribution News 251010

Andrews Water heaters Commercial water heaters Gas water heaters News 251010

Potterton Gas boilers Commercial boilers Condensing boilers Heating systems News 251010

Wavin Building products Drainage systems Stormwater management Water tanks News 251010

Atlantic Boilers Heat exchangers Gas condensing boilers Dual fuel boilers News 251010

UK Flood Barriers Flood barriers Flood defence products Flood risk assessments News 251010

Elliott steel frame systems Building solutions Modular steel buildings News 251010

Sandtoft Clay roof tiles Roof tiles Interlocking clay tiles News 261010

Dimplex Woodburning stoves Electric fires Electric heaters Heat pumps News 261010

Levolux Solar shading Aerofoil fins Roof louvres Aluminium louvres News 261010

Eaton Williams Climate control Data rack cooling Data room cooling News 261010

Komfort Internal doors Door furniture Architectural ironmongery Glazed partitions News 271010

Polyflor Vinyl floor tiles Vinyl flooring Slip resistant flooring News 271010

Dimplex Electric heating Domestic heating Heat pumps Panel heaters News 271010

Eaton Williams Air conditioning Air handling products Fan coil units News 271010

Monodraught Sun pipes Monodraught sunpipes Sun tubes Daylight systems News 271010

AET Underfloor air conditioning Raised access flooring Fan tiles News 271010

Honeywell Heating systems Heating controls Wireless thermostats Heating thermostats News 271010

TilePlans Factory refurbishment Office refurbishment Business relocation Minimal business disruption News 271010

Blucher Pipework systems Rainwater pipework Pipe fittings Drainage pipes News 271010

Cablofil Wire cable trays Power cables Electrical cable trays News 271010

Harlequin Stage flooring Dance floors Studio flooring Sprung floors News 271010

Spiral Cellars Wine cellars Wine cellar design Wine cellar racks News 271010

Torry Hill Chestnut fencing Chestnut products Chestnut stakes Chestnut hurdles News 271010

Marley Eternit Fibre cement slates Roof slates Clay roof tiles News 271010

Pipe2000 Under floor heating Pre insulated pipe Floor screeds News 281010

Eaton Williams Data centre air conditioning Cooling systems Climate control News 281010

Polyflor Vinyl safety flooring Vinyl flooring Slip resistant flooring News 281010

Dimplex Dimplex renewables Heat pumps Electric heating Heat recovery News 281010

Mumford and Wood Timber windows Timber doorsets Sash windows Casement windows News 281010

Booth Industries Steel doors Steel doorsets Security doors Access doors News 281010

John Brash Cedar shingles Timber cladding Scaffold boards Roofing battens News 281010

James Latham Fire doors Acoustic doors Thermal doors Door blanks News 281010

Gradient Flat Roofing Flat roof insulation Roof insulation Tapered roof insulation News 281010

Polyflor Vinyl wood flooring Vinyl tiles Vinyl floor tiles News 291010

Powrmatic Commercial heating systems Heating systems Oil fired heating News 291010

Safety Letterbox Company Anti arson letterboxes Letter boxes Metal post boxes News 291010

Sanyo Split systems Air conditioning Heat pumps Inverter systems News 291010

Roman Shower enclosures Shower doors Shower panels Enclosed showers News 291010

BG Controls Building controls Building management systems Energy management systems News 291010

Waterloo Air Products Air distribution systems Active chilled beams Chilled beams News 291010

Royde and Tucker Door pivots Pivot door hardware Door closer hardware News 291010

Gooding Aluminium Aluminium sheets Aluminium products Ceiling panels Wall cladding News 291010

Dow Roof insulation Floor insulation Wall insulation Internal insulation News 011110

S & P Coils Heating equipment Cooling equipment Heating coils Fan convectors News 011110

Leaderflush Shapland Door ironmongery Internal doorsets Fire doors Door sets News 011110

Tarkett Safety flooring Vinyl flooring Sports flooring Flooring specialist News 011110

ENER-G Ground source heat pumps Air source heat pumps News 011110

3M Hearing protection Noise protection Noise detection Noise control News 011110

Cooper Lighting Fluorescent lighting Energy efficient lighting Lighting products company News 011110

HAKI UK Scaffolding products Work shelters Temporary roofing Stair towers News 011110

Roman Shower manufacturer Shower doors Shower screens Shower designs News 011110

Amtico International Vinyl flooring Slip resistant flooring Vinyl tile flooring News 011110

Ashford Environmental Water treatment systems Water treatment process Water treatment News 021110

ENER-G Heat pumps Efficient lighting Data solutions Renewable solutions News 021110

Socomec Sustainable energy Electrical switchgear UPS systems Power distribution News 021110

Eaton-Williams Climate control Energy efficient cooling Energy efficient ventilation News 021110

Stretch Ceilings Suspended ceiling systems Architectural ceilings Domestic lighting solutions News 021110

ServaClean Mobile bars Mobile counters Bar equipment Bar fittings News 021110

SE Controls Smoke ventilation systems Natural ventilation systems Window automation News 021110

Siemens Intruder alarm systems Intruder alarm products Lighting systems News 031110

UPS UPS systems Protected power Power systems Energy management News 031110

Cembrit Fibre cement weatherboard Wall cladding Wood effect cladding News 031110

SE Controls Natural ventilation Ground source heat pumps Ventilation systems News 031110

ENER-G Ground source heat pumps Renewable energy Heat pumps News 031110

Knauf Insulation Rainscreen cladding systems Insulation materials Thermal insulation materials News 031110

EMCOR UK Engineering services Facilities management Construction services Electrical maintenance News 031110

Vent-Axia Ventilation systems Hospital ventilation Extract fans Insulation systems News 031110

Wienerberger Clay bricks Permeable paving Clay blocks Roof tiles News 031110

Johnstone's Masonry paint Vinyl paint Exterior paint Trade paint News 031110

AET Underfloor air conditioning Flexible space Air conditioning systems News 041110

Pilkington Pilkington glass Glazing systems Laminated glass Glass manufacturers News 041110

Baxi Heating systems Baxi boilers Solar panels Heating technologies News 041110

Weatherite Building services Ventilation systems Air conditioning Kitchen ventilation News 041110

SE Controls Fire alarm systems Smoke control systems Fire detection News 041110

ENER-G Sustainable power Air conditioning units Heating and cooling News 041110

Danfoss Variable speed drives Electric drive systems Danfoss drives News 041110

Polypipe Terrain Plumbing systems Plumbing pipe Composite pipe Plumbing fittings News 041110

Schneider Energy management Energy efficiency Electrical switchgear Electrical distribution News 041110

MK Electric Wiring devices Electrical accessories Electrical cable Electrical switches News 041110

Knauf Drywall Plasterboard partitions Dry lining Plasterboard systems Insulating laminates News 051110

Ruskin Air conditioning systems Ventilation systems Air distribution systems News 051110

SE Controls Natural ventilation Air conditioning Heat pumps Ventilation systems News 051110

Danfoss Danfoss drives Speed drives HVAC systems HVAC systems News 051110

Belimo Control valves Flow rate controllers Belimo damper actuators News 051110

Dow Floor insulation Wall insulation Roof insulation Thermal insulation News 051110

Baxi Hot water systems Space heating systems Baxi boilers News 051110

Cablofil Data cabling Wire cable trays Cable management systems News 051110

Elliott Steel frame buildings Modular buildings Steel framing systems News 051110

Janex Timber windows French doors Patio doors External doors News 051110

HygroMatik Steam generators Humidification systems Steam humidifiers Steam atomisers News 051110

Rocol Spot marking paint Marking paint Aerosol marking paint News 051110

Marley Eternit Roofing products Roof cladding Cladding products Roof coatings News 051110

Arundel Jones Associates Ltd Registered in England and Wales No. 07334149
Hill Farm, Linton Hill, Maidstone, Kent ME 17 4AL
Tel : 01622 745333 email
copyright all rights reserved

News Categories : UPS systems
Protected power Power systems
Energy management