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BSEEADVERTISER’S ANNOUNCEMENT


Mirroring construcon trends in the residenal sector for micro homes, commercial properes also appear to be geng smaller. Between 2012 to 2016, the average size of oce floorspace in London fell by 23.9%. With space at a premium, the need for compact, yet powerful heang products is stronger than ever. Steven Evans, Sales Director at Poerton Commercial, discusses the soluons available.


uPoerton Commercial’s Sirius three 110, 130 and 150kW models are all the same size – giving engineers the choice of more power without addional bulk.


floorspace in commercial premises decreases, so does the size of the plant room. And in some cases, there is no plant room at all. Thankfully, manufacturers have responded to this issue by designing new products or re-designing existing ranges to offer maximum power in a minimum amount of space. For example, the Sirius three 110, 130 and 150kW models are all the same size – giving engineers the choice of more power without additional bulk. Having products which offer different power outputs with the same size footprint is also useful for future upgrades. As businesses grow, they may find their heating demand increases and our compact solutions enable contractors to easily upgrade to a more powerful boiler without taking up any additional space. The 130kW boiler is currently unique to Potterton Commercial and was developed following industry feedback which identified it as the ideal output for a wide variety of commercial projects.


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Continuing the trend of quick and easy installation, Sirius three boilers are also lightweight making them easier to move and install in the desired location. The entire wall hung range comes with advanced Siemens controls with a full- knob Human Machine Interface (HMI) making for more straightforward programming and commissioning. Another consideration is the environmental impact. Heating systems


he mantra for modern construction certainly seems to be ‘do more with less’. This can be challenging for heating engineers because as


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VALUEADDED ENGINEERING Compact heating solutions from Potterton


must not only comply with increasingly strict legislation, but also provide minimal running costs for the end-user. Our Sirius three range offers ultra-low NOx emissions of 24.7mg/kW, thanks to the Sermeta bluejet burners, and a seasonal efficiency of more than 96%. It is listed on the Energy Technology List (ETL) as an approved product for the Enhanced Capital Allowance (ECA) tax scheme, meaning companies can write off the cost of the new plant or machinery against the business’s taxable profits in the financial year the purchase was made.


In addition to the initial capital expenditure, the long-term price of keeping the boiler must also be considered. A key indicator of low running cost is the product’s modulation ratio, or the difference between the maximum and minimum output of a boiler, which is often expressed as a ratio.





Having products which oer dierent power outputs with the same size footprint is useful for future upgrades. As businesses grow, they may find their heang demand increases and our compact soluons enable contractors to easily upgrade to a more powerful boiler without taking up any addional space.


’ 32 BUILDING SERVICES & ENVIRONMENTAL ENGINEER SEPTEMBER 2018


Modulation ratio is important as once a room has reached the desired temperature and thermostatic radiator valves (TRVs) are closed, the power demands on the boiler will be considerably lower. If a boiler has a narrow modulation ratio, this means that the minimum output of the boiler will be higher than it needs to be, causing the boiler to constantly switch on and off. This wastes fuel and adds additional wear and tear to components. A wide boiler modulation ratio reduces constant on/off cycling, therefore improving efficiency and extending the life of a boiler. It also offers flexibility for premises which have fluctuating heating demands. In a typical office environment, space heating and hot water requirements are at their peak during the week in the daytime when most staff are present. This is when the boiler is likely to draw close to its full capacity. However, when one or two


staff members are working late – perhaps only using one or two rooms - this demand would be much less. A boiler that can modulate widely to accommodate both scenarios will ensure thermal comfort without excessive energy use.


The Sirius three range offers a market- leading modulation ratio of up to 9:1. For the 50kW model, this means output can be as little as 6kW when demand is not present. However, alternative approaches to boiler system design, such as cascades, should also be considered to provide even greater efficiency and long-term cost savings. A cascade system is two or more boilers electronically controlled on a common hydraulic header. The ‘master’ boiler is the primary appliance, sending commands to each of its subsidiary boilers according to the demand for heating and/or hot water. Cascades offer greater efficiency than singular boilers as they have a high turndown rate, with a substantial difference between the highest and lowest output available. For example, six 90kW Sirius three boilers on a cascade set-up have a maximum output of 540kW, but an individual boiler can also modulate down to 10kW to save energy when demand is not present. Multiple, linked boilers can respond more effectively to varying heat loads, making a cascade the perfect solution for buildings with changeable demand schedules. Furthermore, more than one boiler in a system adds a layer of redundancy as in the unlikely event that one breaks down, the system will continue to operate, albeit at reduced levels. Social and economic changes will continue to affect the demands upon the heating industry, which is why constant innovation is required to ensure products always meet the needs of the installer and end-user alike.


www.pottertoncommercial.co.uk VISIT OUR WEBSITE: www.bsee.co.uk


uWith commercial properes geng smaller, Poerton Commercial is meeng the need for compact, yet powerful heang products.





The Sirius three


range oers a marketleading modulaon rao of up to 9:1. For the 50kW model, this means output can be as lile as 6kW when demand is not present. However, alternave approaches to boiler system design, such as cascades, should also be considered to provide even greater eciency and longterm cost savings.





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