Tag Archive for: stainless steel

FUSION Commercial Hybrid Hot Water Systems from Adveco

  • FUSION is a complete range of low carbon hybrid heat pump and electric hot water systems
  • Resilient stainless steel water heating suitable for all UK regions
  • Compact design for new build and refurbishment projects seeking greater sustainability

Commercial hot water specialist Adveco, introduces the FUSION FPH-S range of low carbon, all-electric, packaged hybrid hot water systems. FUSION harnesses Adveco’s FPi32 Air Source Heat Pumps (ASHP), a high-pressure ATSH calorifier with electric immersion, controls, and metering to provide a reliable, high-temperature, sustainable and cost-effective system for new commercial build and refurbishment projects.

FUSION is available in 16 pre-specified variants with 6 or 10 kW preheat and 9 or 12 kW electric top-up, with capacities ranging from 200 to 500 litres all rated at 10 BAR for high-pressure applications. Able to meet a range of continuous capacity hot water demands from 257-377 litres/hour makes FUSION highly adaptable for a wide range of commercial buildings.

The FPi32 ASHP is specified to supply a working flow of 50°C for system preheat throughout the year, even when ambient air temperatures drop as low as -25°C. Electric immersion top-up then raises system temperatures in the calorifier to the necessary 60°C to meet commercial requirements for safe hot water demands. The stainless steel construction of the ATSH also makes it an excellent all-rounder, resistant to soft water corrosion and, with FUSION’s unique low electric immersion heat intensity (6W/cm²), is more resistant to scale build-up in hard water areas.

The physical design, dedicated controls and integrated metering ensure the ASHP preheat, and immersion work seamlessly to deliver the highest operational efficiencies. This enables FUSION to make the greatest gains possible from the heat pump, even when ambient temperature and system demands fluctuate. These gains offset much of the direct electrical energy usually required, delivering 53% carbon emissions saving and helping control the operational costs of providing business-critical hot water.

“For organisations with small to medium basin and sink led hot water demands and a desire to embrace a more sustainable business model, the FUSION FPH-S range provides a single, easy to accommodate, highly effective response,” says Bill Sinclair, technical director, Adveco. “By choosing one of these packaged hybrid water systems you gain optimum efficiencies, lower your carbon emissions and can be assured building regulations are being met for your commercial project.”

Fusion FPH-S Features

  • 16 pre-sized variants to meet a wide range of applications
  • 200, 300, 400 and 500-litre capacities
  • 6 or 10kW ASHP preheat
  • 9 or 12kW direct electric immersion heating
  • 257-377 litres/hour continuous capacity
  • 10 BAR high-quality AISI 316Ti and 316L stainless steel vessel (PED (97/23/EC), EN 12897)
  • Dedicated control system for simple operation and maintenance checks
  • Lower global warming potential with R32 ASHP
  • Compact space-saving form factor

Adveco ATSx Stainless Steel Hot Water Tanks for Soft Water Areas

  • A complete range of indirect hot water calorifiers and buffer vessels.
  • Corrosion-resistant stainless steel construction for soft water areas.
  • Designed for high pressure, lower demand projects.

Commercial hot water and heating specialist Adveco, announces the ATSx range of stainless steel hot water tanks. The new product range encompasses five classes of vessel up to 1,000 litre capacity at 10 bar as standard to serve as buffer vessels and indirect hot water calorifiers. The range is designed to provide a more economic choice for high pressure, lower capacity commercial applications in soft water areas.

With single coil, twin coil and plate heat exchanger options for maximising transfer of energy, the ATSx stainless steel hot water tanks offer consultants, specifiers and contractors a broader set of options for the storage and delivery of domestic hot water (DHW) in soft water areas for their projects.

ATSI – Single coil indirect water heater.

ATST – Twin coil indirect water heater.

ATSH – Single double-helical high-capacity coil indirect water heater.

ATSR – Twin coil indirect water heater for lower-temperature renewable applications.

ATSB – Storage/buffer tank without coil.

Speaking of the launch of the ATSx range, Adveco’s Technical Director Bill Sinclair said:

“If your project has smaller hot water demands, but with pressure requirements greater than six bar, such as in taller buildings with a basement plant room, then the ATSx vessels are by far the most efficient and cost-effective choice for your project,”

Constructed from corrosion-resistant AISI 316Ti and 316L stainless steel, all ATSx tanks are designed, manufactured, and tested to the requirements of the Pressure Equipment Directive (97/23/EC), EN 12897.

The ATSx range is also supported by a choice of options and ancillaries from Adveco including control and overheat thermostats, destratification pump kits and unvented kits.

For projects with larger demands or requiring greater customisation in soft water areas, Adveco offers its SSB, SSI and SST ranges of bespoke stainless steel calorifiers and buffer vessels.

Discover more about Adveco’s ATSx range


Adveco commercial hot water and heating. For more information about Adveco’s ATSx stainless steel hot water tanks, call us on 01252 551 540 to discuss requirements, sizing etc.

 

Corrosion in Commercial Heating & Hot Water Systems: Part 3

Part 3 Preventing Corrosion – Glass Versus Stainless Steel

There are several methods for addressing different forms of corrosion that occur within commercial hot water systems.

Adding tin to brass, for example, creates Dezincification Resistant Brass (DZR). Fittings manufactured from this alloy will be marked in the UK with the letters CR (Corrosion Resistant) or DZR (dezincification resistant).

Commercial glass-lined steel water heaters and tanks are also attractive propositions as the glass is, given the right conditions, generally resistant to attack from most chemicals and corrosive materials. The glass is composed of several oxides and silicates blended and heated to the melting point. The first coat of glass is applied to develop a chemical bond with the steel of the tank and has limited corrosion resistance. After the ground coat, layers of chemically resistant glass are then added to create a smooth surface which is more resistant and easier to clean, making them popular in harder water areas.

However, not all glass-lining processes are equal with some being prone to developing microscopic cracks in the lining of the vessels. This means that small areas of the steel cylinder shell may get exposed to water, and there is an opportunity for corrosion to take hold.

Galvanic corrosion in water heaters and tanks is typically managed using cathodic anodes made of magnesium that offer a target for oxidisation in lieu of the steel shell, corroding or being ‘sacrificed’ first. Regular checks and replacement of anodes is critical in delivering ongoing protection from corrosion. Protective epoxy and plastic coatings can also be used to reduce corrosion by preventing conductivity from the water to the metal.

Corrosion in Commercial Heating and Hot Water Systems - Part 3The attack rate is determined by temperature, duration, and the concentration of reagents, for example, the presence of fluorides at any temperature will corrode a glass-lining.

In naturally soft water conditions, despite the use of sacrificial anodes, glass-lined vessels can rapidly succumb to critical corrosive damage. Due to a lack of dissolved metal ions, the purer soft water has low electrical conductivity, so the electrical flow from the anode to the cathode through the water is reduced. This adversely impacts the chemical reaction between sacrificial anode and cylinder shell, reducing the protection. In such cases, when the sacrificial anode is inspected its condition can be extremely good, but this is likely to be a strong indicator that the anode is failing in its role, meaning the water heater itself is being corroded.

The usual alternative to the sacrificial anode is the powered anode. Often made of titanium, the powered anode rather than giving up its own electrons and producing an electrolytic current produces a very low current in the water. This should provide a similar protective effect for a heater’s steel shell but without corroding the anode. However, in soft water areas, a powered anode may still not have a protective effect, as the conductivity required of the water by the anode is too poor.

For this reason, commercial hot water systems in Scotland, south-west and north-west of England and the west of Wales where water is particularly soft will typically need to employ a stainless-steel appliance. Better able to stand up to both water-side and combustion-side assaults, a stainless-steel heater is less susceptible to corrosion, due to the composition of the alloys, which create a protective oxide barrier on the waterside that naturally helps prevents corrosion, even when temperatures increase. Able to withstand higher temperature water (in excess of 80°C) than glass-lined appliances, stainless-steel lends itself to solar thermal and wider commercial applications.

Typically, stainless-steel will be used in indirect DHW heaters, where the internal heat transfer coil is connected to a boiler or a solar thermal collector loop; and in condensing water heaters where the push for higher efficiency condensing units has led to stainless steel being used to construct the heat exchangers. To achieve high efficiencies, flue gases must be cooled below the dew point to release the latent heat of condensation. With very low pH and high acidity, the resultant condensate would have a highly corrosive impact on the surfaces of the heat exchanger which regular steel or copper would struggle to withstand for any length of time.

Stainless steel is therefore preferable due to its versatility for creating intricate forms required by the heat exchanger and its high resistance to corrosion. This does mean stainless steel construction is typically more expensive, due to both higher material and manufacturing costs. Commercially, the investment is worthwhile, especially in soft water areas where, compared with replacement costs as a result of corrosion in glass-lined alternatives, stainless steel can prove far more cost-effective, with its quality reflected in the longer product warranties.

In the commercial world, domestic hot water (DHW) appliances are subjected to extremely hostile conditions, with high temperatures, thermal stress and flue gas condensate on the combustion side and oxygen, minerals and chemical attacks leading to potential corrosion on the waterside. Given this harsh daily treatment, regular servicing and maintenance are key if business-critical service is to be observed. Failure to descale, flush sediment, check anodes or test for corrosion will reduce the operational longevity of any appliance. In soft water areas, poor consideration of prevalent conditions and a lack of regular maintenance can reduce an appliance lifespan from years to a matter of months!

Correctly sizing, obtaining and then regularly servicing the right appliances and ancillaries for your application is critical if a commercial hot water system is to operate safely, efficiently and cost-effectively.

Read Part 1 – Recognising the causes of corrosion

Read Part 2 – Testing for corrosion