Tag Archive for: buffer

Calorifiers and Hot Water Storage in Corrosive Water Conditions

For many companies, the assured availability of hot water is a business-critical issue, but one that can quickly become costly for those operating in the southwest and northwest of the UK, the Welsh coast and throughout Scotland. With a low pH, low total dissolved solids (TDS) and negligible buffering capacity, these naturally soft water areas prove highly corrosive to glass-lined vessels used as calorifiers and hot water storage.

Glass is, given the right conditions, generally resistant to attack from most chemicals and corrosive materials and easier to clean, making it a popular choice for lining steel vessels used in hot water systems. But corrosion is a complex phenomenon, and in naturally soft water conditions, despite the use of sacrificial anodes, glass-lined vessels can rapidly succumb to critical corrosive damage.

Pressure to Perform

In addition, the taller the structure, the greater the pressure requirements on the system, particularly since a common design choice is to locate the plant room in the basement. In order to meet, even small demands with a consistent, strong flow of hot water systems inevitably are oversized, adopting a larger, often bespoke tank.

This immediately exacerbates the existing threat, as oversizing, or the failure to correctly balance water flow also contributes to system corrosion. Oversizing of the pumps leads to high-velocity hot water circulating through the system and suspended solids in the water are driven against the metal leading to erosional corrosion. This process helps accelerate the soft water corrosion at points where water changes direction, such as when passing into or through tanks.

Glass-lined water vessels used as calorifiers and hot water storage under these conditions can potentially fail due to corrosion in a matter of just months – even with the use of sacrificial anodes. For these reasons, manufacturers will reduce or have even ceased to offer warranties on glass-lined products installed in these soft water regions. As a result, their specification into projects in these regions really can be a false economy.

Change to Resistant

Far more resistant to these water-side assaults are stainless steel vessels. Although there is a higher upfront cost, this would be easily offset by the relative longevity of the appliance. However, projects with smaller, yet higher pressure hot water demands, will still face the issue of oversizing. This further extends capital costs, of products, installation and the need for greater plant room space. As a result, project costs can become prohibitive for stainless steel, resulting in the specifying of the less expensive glass-lined alternatives gambling that they will prove resistant enough in the mid-long term.

Adveco addresses these concerns with its ATSx range of compact stainless steel, high-pressure hot water tanks. Specifically designed to serve as buffer vessels (ATSB) and indirect hot water calorifiers suitable for use with lower capacity, high-pressure commercial applications in soft water areas. The ATSx range provides specifiers and contractors with a wide choice of calorifiers and hot water storage vessels all rated to 10 bar as standard, which are by far the most efficient and cost-effective choice for businesses with smaller system demands.

Another advantage provided by the indirect water heaters in this range (ATSI, ATST, ATSH & ATSR) is that due to the transferral of heat through the walls of the heat exchanger element the two fluids do not mix. This allows for more options in terms of the external heat supply and introduces a range of renewable technologies that use other fluids for heat transfer including solar thermal collectors and Air Source Heat Pumps. The twin coil ATSR has been specifically designed for these lower-temperature renewable applications. These calorifiers are also relatively simple to install, since there is no burner, there is no need for a gas supply to be directly connected to the appliance and the is no requirement for a flue.

As with any hot water application, understanding the relationship between storage and recovery, and correct sizing is extremely important for efficient and cost-effective operation. Integrating a stainless steel calorifier within a hot water system gives you a number of design options, with a large efficient boiler a calorifier can be smaller avoiding unnecessary capital and ongoing operational expenditure. At 200 to 1000 litres the ATSx range provides a compact, tough resolution for lower demands applications in those soft water areas. If your project has pressure requirements greater than six bar, then the ATSx vessels are by far the most efficient and cost-effective choice for your project.

If the boiler is smaller, or demands for hot water are greater, then going too small means the storage could prove inadequate and the system will not achieve its operational requirements. For projects with larger demands or requiring greater customisation Adveco can support the project with the SSB, SSI and SST ranges of bespoke stainless steel calorifiers and hot water storage vessels.

Discover more about the Adveco ATSx range.

Learn more about soft water corrosivity.


Adveco commercial hot water and heating. Speak to Adveco about tackling global warming through efficient, low-carbon commercial hot water and heating systems (For schools, hospitals and care homes too!)

Call us on 01252 551 540 or see our other contact details.

 

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.

 

Chilled Water Tank header image

Chill Out – Building Cooling and Conditioning

With improvements in air-tightness, insulation and the increasingly common presence of sealed windows, especially in multi-storey offices and accommodations, modern buildings are increasingly prone to overheating, driving the need for large scale and efficient air conditioning and cooling. At the heart of these HVAC systems will be a chilled water loop circulating through coils in the air handler units. There the chilled water, which is typically delivered into the piping system at between 5°C and 8°C, is used as a refrigerant to remove unwanted heat from the building.

Should the cooling system’s piping capacity be undersized, then the relatively low water volume causes the system to suffer from a range of problems such as compressors short cycling; poor temperature control and erratic system operation. All of which makes it harder to maintain comfortable conditions within the building. Chiller manufacturers, therefore, recommend between 11.5 to 23 litres of water per metric tonne (907 kg) for typical HVAC systems, climbing to between 23 and 40 litres per metric tonne for nominal cooling when temperature accuracy is critical.

By increasing the water ‘buffer’ capacity of a chiller system performance can be drastically improved. Chilled water tanks are therefore an essential component in modern-day conditioning systems, providing this increased capacity to ensure water temperature is stabilised within the parameters set by the chiller manufacturer for optimal operation.

Chilled Water Tanks (CWT) for building cooling and conditioning from Adveco.Adveco offers a versatile range of carbon steel Chilled Water Tanks (CWT) for commercial systems, featuring high and low-level tank connections that are suitable for moderate to high flow rates with a maximum working pressure of 6 bar. By expanding the total system volume and reducing the rate of temperature change in the return water by increasing thermal inertia through efficient insulation, temperature control is improved within a building’s cooling and conditioning system. And with better temperature control comes reduced condenser cycling and improved system start-up times, all of which helps to increase the chiller’s lifespan.

Should a system demand even greater accuracy of temperature control then higher storage volumes will be required. Adveco provides a choice of nine CWT vessels ranging in volumes from 500 to 5000 litres which offer a working temperature range of -10 to +60 C

Further information on the Adveco CWT range

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