The Elgressy non-chemical treatment system for cooling towers combining electrolytic scale reduction and electro-chemical system for eradicating legionella is now available in the UK. Hundreds of these systems are installed around the world, and EWT Ltd has been set up in the UK to distribute them.

The EST system for scale reduction can be incorporated into cooling towers in two ways. — in the make-up water circuit or in the main cooling-water circuit.

Treating all the water is preferable as its hardness increases during the cooling cycle.

Single units come in four sizes for flow rates from 5 to 20 m3/h. Greater flow rates can be accommodated by installing units side by side.

The LPB disinfection system is connected in series with the EST to prevent precipitation of silicates and treat for legionella and other micro-organisms.

The EST process works by producing OH- ions at the cathode that cause calcium-carbonate to peel off the walls of the tank. The cathodic reaction also causes metallic ions to precipitate and sink to the bottom. When required, a piston is actuated in the tank, which descends and scrapes the softened scale to the bottom. The outlet valve opens automatically, and the scale is evacuated. The process is not one of softening, but the precipitation and removal of calcium carbonate, thus preventing scale and corrosion.

The LPB system is similar to the EST but contains a different anode made from metals that release inhibiting materials to the water. Even after having passed through the EST, some calcium carbonate and silica compounds remain in the water. The LPB system charges these salts, increasing their ability to dissolve in the water and prevent them settling. The combination of EST and LPB treats the water to prevent proliferation of legionella bacteria and other micro-organisms. Legionella cannot tolerate the high pH or survive a high concentration of magnesium hydroxide; both conditions exist in the EST/LPB system. In addition, the high current density raises the pH on the cathode surface to 13, destroying bacteria.

Tel. 020 8806 0095

Pump distributor KSB has developed a web-shop providing a one-stop solution for customers to select pumps and spares and order them online. This development speeds up selection and product identification, pricing and ordering.

Customers’ details are stored, and discounts are automatically applied.

The site is updated regularly, helping to eliminate mistakes that can be made by ordering from catalogues that are out of date.

Finding spares is made easy by finding the right pump and then selecting the part from an exploded diagram.

Alan Bell, KSB’s marketing director, says, ‘Time is a commodity which many of our customers compete on, particularly with distribution. Those customers who sign up to the KSB web-shop can select, price and state delivery while on the phone ot their customer. With the ability to produce a technical quotation, they can also back this up in writing with one action.’

Tricool’s TRE range of process chillers has been designed for longer life, reduced maintenance and the ability to perform in variable water conditions without compromising performance or specification.

Martin Storey, the company’s sales director, explains, ‘Depending on the application and the quality of water, some commercial chillers may have an average life expectancy of five to six years due to the use of dissimilar metals in evaporator construction. Replacing corroded evaporators is costly, but the TRE range has been specifically designed to help combat corrosion.’

The design uses an aluminium-free shell-and-tube evaporator that is insensitive to electrolysis and a removable end housing that provides easy access for cleaning and maintenance. The latter enables easy access so that any build-up can be flushed away.

Another key design feature is the use of cast-iron pumps. They are self lubricating and can be turned off when required without seizing up, unlike stainless steel.

The TRE range is based on a standard design with 15 variants offering cooling capacities from 3 to 170 kW.

A range of fully packaged air conditioners for retail applications has been developed by Airedale. They are designed for superstores, warehouses, department stores and other retail outlets.

These single-circuit direct-expansion units offer 50 or 77 kW of cooling using hermetic tandem scroll compressors.

The 50 kW units feature first-stage free cooling followed by mechanical cooling. The 70 kW unit uses different-sized compressors to provide free cooling followed by 2-stage mechanical cooling.

A free-cooling economiser damper section reduces running costs throughout the year and improves energy-efficiency ratios.

Direct-drive plug fans in an attenuated scroll house reduce nose from discharge and breakout. These Storemaster units have a small footprint and supply and return duct connections on the top. A split-case option is available for use in plant rooms.

The Airetronix micro-processor control electronic expansion valves to achieve high energy-efficiency ratios and permit adjust of airflow. Heating options include indirect gas, electric and LPHW.

The option of constant air volume maintains design air flow against rising static pressure. Other options include soft start, compressor power-factor correction, phenolic-coated coils and coil guards.

Storemaster units are despatched with a full charge of R407C. There is also a pre-charge option for split systems with pipe runs up to 5 m.

info@airedale.com

High levels of natural daylight can be brought into dark areas in buildings using Sola Skylights’ Sky Tunnel. They are easily installed in pitched or flat roofs in just a couple of hours.

A flexible connector with highly reflective inner surface simplifies installation. They are available in lengths of 3, 4, 5 and 6 m.

Two sizes of Sky Tunnel fit between 14 and 16 in frame centres.

They are best installed on a south-facing roof. Standard units can be configured to act as trickle ventilators.

Other options include a system to cut off daylight transmission when required. An electric light can be installed within a unit to provide illumination at night.

solaskylights@aol.com

The Atlas range of unit heaters from Sabiana is now available with a 5-speed single-phase motor giving widely variable output and more flexibility and versatility.

They provide an economical heating solution for many applications — from factories to sports halls and plant nurseries.

There is a wide range of outputs and a choice of models suitable for LTHW, MTHW HTHW and steam.

Viessmann has made a clear entry into the mainstream UK domestic-boiler market with the launch of the Vitodens 200 range of condensing boilers. Two models are available, a combination and a system boiler. Both have modulating outputs from 8 to 26 kW and efficiencies of 96% (SEDBUCK A).

In response to installers’ concerns about the service life of condensing boilers, the entire heat-exchanger assembly from the burner ot the flue takeoff is in stainless steel.

There is the choice of fixed flow temperature or a Vitotronic control that can increase condensing performance using weather and room-temperature information.

Also recently launched are the Vitodens 300 and 333 boilers.

The 300 gives outputs up to 66 kW and can be installed with a cascade controller in modules of up to four boilers — making it suitable for many smaller commercial projects.

The 333 is a combination boiler with built-in hot-water store of up to 85 litres, boosting performance for larger houses with multiple hot-water outlets — usually a problem for conventional combis.

info-uk@viessmann.com

A portable-appliance tester meeting the minimum requirements to comply with statutory requirements is available from Martindale.

The EasyPAT is quick and easy to use. It carries out the mandatory earth-bond and insulation tests, plus a fuse test. Earth-continuity tests can be carried out at 8 A, 25 A and 100 mA, enabling all appliances, including personal computers, to be tested.

Labels showing the date of test and result are available.

sales@martindale-electric.co.uk

Stourflex stainless-steel products from pipework-expansion specialist J&P Supplies are now approved under the Water Regulations Advisory Scheme (WRAS). They have passed the BS 6920 tests for extraction of metals and odour flavour tests for water.

The range of products tested includes anti-vibration and pipework expansion bellows, hose assemblies, and air and dirt separators.

When correctly installed, these products comply with the requirements of the UK Water Regulations/Byelaws (Scotland).

info@jpsupplies.co.uk

An average COP of 5.7 is claimed for a range of water-cooled liquid chillers from Delrac.

There are 18 models in the EWH range of single- and twin-circuit chillers. They are designed for use with R134a and offer cooling capacities from 105 to 1204 kW.

The high performance is attributable to a dedicated heat-exchanger design and specially refined screw compressor. These chillers use counter-current, dry-expansion shell-and-tube evaporators. The evaporators also allow the chillers to be smaller, and they use less refrigerant than other designs.

Options include electronic expansion valve, modulating capacity steps, safety water flow switch, liquid injection, rubber type vibration damper, spring vibration damper, remote micro-processor, compressor suction shut-off valve, RS485 serial interface, anti-freeze electric heater, compressor overload relays and compressor oil-level switch.

sales@delrac-london.co.uk

Potterton Commercial has added condensing boilers to its Derwent Compact Plus range. Available as three floor-standing models with outputs of 55, 92 and 128 kW, the new boilers use the tried-and-tested Derwent waterway and a stainless-steel secondary heat exchanger to achieve a net efficiency of 103%.

The small footprint and low prices of these competitively priced boilers are combined with low NOx burner technology. They are also qualify for Enhanced Capital Allowances.

The panel on top of the boiler gives easy access to the improved controls. Volt-free contacts are standard, allowing for simple boiler integration, easy modularisation and the use of sequencing and zone controls. These condensing boilers can form all or part of a comprehensive boiler package, providing total control of heating plant, with weather compensation and optimisation — in addition to significant energy savings.

commercial@potterton.co.uk

Glow-worm has tackled the problem of the vapour cloud that can surround the flue terminal from a condensing boiler with a kit that enables the flue outlet from a horizontal terminal to be raised by up to 6 m. It is based on 50 mm push-fit waste-pipe fittings.

These kits can be used with all of the Glow-worm range of high-efficiency domestic heating boilers, and can be retro-fitted onto the standard horizontal flue terminal.

Sediment strainers with socket union ends are now available as part of the Durapipe ABS and Corzan ranges. They complement existing versions in PVC-U, in grey or clear bodies, and polypropylene.

A filter screen mechanism removes solid impurities from moving liquids.

Socket union ends enable sediment strainers to be changed easily. The strainer can be replaced simply by unscrewing the end cap and replacing it. Sizes range from 20 to 63 mm, and they are pressure rated at 16 bar.

All Durapipe ABS fittings are suitable for applications down to -40°C. Crozan is suitable for high-temperature chemicals up to 100°C.

enquiries@durapipe.co.uk

Daikin has extended its range of fan-coil units. Floor-standing and ceiling-suspended/low-wall models are housed in modern-looking casings restyled by Italian designers and finished in RAL 9010 colour. There are also ceiling-concealed/floor-standing chassis models and large ceiling duct models.

Available as 2- and 4-pipe units, there are seven capacities from 1.54 to 8.71 kW. The duct models have capacities from 3.9 to 18.3 kW and up to 200 Pa. Units have water connections on the left, with connections on the right to order.

New features include a double-inlet centrifugal-fan assembly with vibrating damping support, making possible sound-power levels as low as 34 dB(A), removable and washable filters and pre-assembled or factory-mounted on-off 3-way motor drive valves

There is a choice of three controllers.

The electro-mechanical type is built in.

The electronic type is available as built-in or remote and has standard water probe and air sensor. It offers automatic fan-speed selection based on the difference between set point and room temperature plus automatic changeover between heating and cooling.

Up to four FCUs can be regulated by a single control via the Daikin interface combined with the electro-mechanical controllers.

There is a standard quick-fixing system for wall and ceiling mounting. The wiring has quick connections for accessories and screw connections for field wiring. A single electronic controller can handle any configuration by the setting of DIP switches.

Emerson Network Power has added 5 and 6 kW models to the Liebert Hiross range of Hiwall TT packaged air conditioners. The range provides cooling capacities form 5 to 21 kW and aims to give a complete solution to mobile network cooling problems.

Designed for outdoor installation, these direct expansion units have a built-in air-cooled condenser and air output from the top, which is suited to the specialist cooling requirements of mobile telecommunication sites. They have low noise levels.

Features include free cooling so that outdoor air is used to cool the site when weather conditions permit to significantly reduce running costs. Emergency cooling served by a 48 V supply from batteries maintains conditions during a power failure. The robust steel cabinet is protected by vandal-proof screws and optimised for reliable operation, even in extreme environments.

Features of a new direct-coupled actuator from Honeywell include self-centring shaft adapter ‘for plug-and-play’ installation, ability to mount in any direction, detachable wiring box for easy connection, rotation direction switch and position indicator.

SmartAct actuators can replace most types of existing actuator. They can be used for operating air dampers, air handlers, ventilation flaps, louvres and VAV units.

Installation is simplified by a declutch button, which allows easy manual adjustment, and single-handed positioning of the mechanical limits for the rotation angle.

hvacproductsuk@honeywell.com

Cooper Lighting’s Moduspec T5 semi-recessed modular luminaire has been developed to meet the latest criteria for offices where VDTs are used. This luminaire combines efficient louvre-controlled downlighting with a gentle ceiling-wash effect created by a prismatic lens and perforated-panel arrangement.

High-frequency control gear is standard. There is a choice of three or four 14 W T5 fluorescent lamps and a choice of mirror- or satin-finish Xenoptic anodised-aluminium louvres.

These 600 mm-square luminaires are suitable for lay-in or draw-up applications in exposed T concealed-fix and metal-pan ceilings. They protrude only 85 mm into the ceiling void.

The Moduspec range includes fully integral emergency versions, with or without self-test facilities. All 4-lamp models can be fitted with Crompton Intellect lighting control if required.

A fully recessed version with solid or perforated feature panels is available.

Hushon describes its cassette split heat-pump air-conditioning system with fully ductable outdoor unit as ideal for overcoming applications with excessive refrigerant pipe runs or where external plant location is difficult.

Four sizes cover capacities from 7 to 12 kW. Three models to be introduced soon will extend capacities from 4 to 15 kW.

Hushon supplies air-conditioning equipment with outdoor units with centrifugal fans, so that are suitable for internal location and ducting. This technology has now been applied to the cassette split.

sales@hushonuk.co.uk

Kingspan Insulation has launched an 80-page updated edition of its two-in-one guide to its KoolDuct zero-ODP system of pre-insulated ducting.

There are separate specification and fabrication sections, so that all information can be sourced from a single publication.

There is a gallery of projects in the UK as well as a project specification that addresses important factors relating to the design of ventilation ducting systems.

literature.uk@insulation.kingspan.com

‘Lighting solutions’ is a 480-page comprehensive handbook of lighting technology from Cooper Lighting & Security. Its scope ranges from emergency luminaires and central battery systems to architectural luminaires and lighting control systems.

It brings together lighting products under the Crompton Lighting, Menvier and JSB brands.

There are 25 new product ranges and a further eight that have been significantly revised or augmented.

A technical section contains useful information and advice, including design guides, spacing tables fo emergency lighting, details of lighting standards and Building regulations, lamp data and a glossary of lighting terminology.

info@cooper-ls.com

To help improve working environments, Nederman has produced a 116-page guide to its range of safety and health products.

They include capture-at-source extraction systems for controlling airborne dust, fumes and gaseous hazards, and bench-top extraction units for removing fumes, gases and vapours.

For effective workplace screening, Nederman modular panels absorb noise and are flexible and load bearing.

The catalogue includes details of the company’s installation and maintenance services.

info@nederman.co.uk