With a growing requirement to carry out heating refurbishments in live environments, James Porter of Remeha looks at how compact, flexible, high-performance condensing boilers provide a winning solution to keeping the heating on.
In a potentially turbulent year for the construction industry, Gavin Watson of Elco Heating Solutions outlines the importance of precision when designing CHP and boiler heating in order to maximise efficiency and reduce running costs.
As owners and operators of commercial buildings continue to explore how best to achieve maximum energy efficiency from their heating systems, hybrid solutions are growing in popularity. Pete Mills of Bosch Commercial & Industrial explains why combined heat and power (CHP) systems are the perfect partner for gas boilers.
The Econoflame R6000 range of condensing ultra-low NOx premix commercial boilers from Stokvis Energy Systems comprises seven models with outputs from 142 to 539 kW. These boilers use the patented water-cooled down-firing premix burner system with a stainless-steel heat exchanger and have NOx emissions of 15 to 35 mg/kWh with 0% O2. They can achieve seasonal efficiencies of up to 110.4%.
Boiler plant with a large turndown ratio can respond to various challenges presented by commercial heating systems — especially heat networks. Paul Mickleburgh of Hamworthy Heating takes up the story.
The complete refurbishment of the plant room of Horringer Court School in Bury St Edmunds includes five Thision L Evo boilers from Elco. They each have an output of 140 kW and have been arranged back to back in a free-standing cascade frame to maximise output in a restricted area.
Flues are an essential part of any commercial boiler installation. Dennis Milligan of the British Flue & Chimney Manufacturers’ Association offers advice on how to select and install the correct chimney or flue as part of such an installation.
Two floor-standing condensing boilers from Ideal Commercial Boilers have replaced two old cast-iron sectional boilers at Normanby House, the dermatology and ophthalmology departments of King’s College Hospital in London. the Imax Xtra 240 boilers were specified by Matt Gent, project manager with JD Services HVAC Ltd and were chosen primarily for the compact size, quality and small carbon footprint.
Errors and inconsistencies in the commissioning of boilers cost installers time and end-users money. More careful consideration of flow-rates and the adoption of new automatic commissioning technologies can change this, as Jonathan Grist of Viessmann explains.
Rural Energy has installed another biomass boiler, the third, at the historic Welbeck estate in Nottinghamshire. The estate covers over 6000 ha, and the latest boiler has been installed at Colingthwaite Farm, the estate’s dairy farm and the home of Stitchleton cheese. The 100 kW Herz Firematic boiler heats a range of buildings, including the farmhouse, farm offices and the cheese dairy. It uses home-grown timber.
As part of a £28.3 million investment over two years to retrofit energy-efficiency and renewable technologies into its property portfolio, Bupa UK collaborated with Bosch Commercial & Industrial to install over 200 bespoke heating systems comprising a CHP module paired with condensing boilers.
As part of the transformation of the former Terry’s chocolate factory in York into an exclusive housing development, Evinox Energy worked with The PJ Livesey Group to provide a comprehensive district-heating system. Called The Residence, this prominent 5-storey Grade 2 listed building is being developed into over 170 spacious apartments and penthouses.
Selecting energy-efficient boiler plant is just the first step in efficiency. How it is controlled through its life is just as important. Kevin Stones of Hoval illustrates this principle with reference to heating systems served by cascade boiler installations.
Hamworthy Heating’s Stratton mk2 wall-hung boiler has the smallest output in the stainless-steel family and is described as a great match for restricted-space plant rooms. These boilers have been designed to assist customers in refurbishment projects. The robust qualities of stainless steel make it very tolerant of older heating circuits and resistant to corrosion for easy maintenance and a long life.
Reduced boiler run-times on modulating and two-stage boiler plant do not necessarily equate to energy savings. The only accurate measures are a reduction in kWh or fuel consumption, says Tony Willis of Sabien Technology.
According to the Carbon Trust, heating and hot water can account for as much as 60% of total energy use in a commercial building. With energy saving high on the agenda, replacing an old, inefficient boiler may seem an easy fix, but Neville Small of Potterton Commercial explains why careful consideration should be given to the replacement and points to the benefits of boiler cascades.
Improving the energy performance of the UK’s buildings remains one of the greatest challenges facing the building-services industry. With today’s boilers capable of achieving the required increased reliability and high thermal efficiency, the goal now is to engineer for maximum efficiencies, says James Porter of Remeha.
Alpha Heating Innovation has installed boilers throughout a high-end residential development of 55 apartments in Edinburgh. Harbour Green offers apartments with one, two and three bedrooms and is on the seafront at Portobello, less than three miles from the city centre.
Paul Sands of Stokvis Energy Systems gives an insight into the technology that makes modern wall-hung boilers so efficient and how to ensure that system design maximises their capabilities.
Biomass boilers burning wood pellets are sophisticated pieces of kit. Oliver Duckworth of Windhager UK gives an insight into their complexity and capabilities.
Remeha has developed a new brand identity as part of its ongoing investment into the commercial heating market. Recent research carried out by the company confirmed its position as an established, solid brand with a reputation for supplying high-quality, good-value, reliable products. Consultants, specifiers and contractors all viewed it as best in class for performance, efficiency and engineering quality.
In the complex and multi-disciplinary environment of building services, keeping up with the latest boiler technology can be a challenge. Gavin Watson of Elco Heating Solutions explains what is required from a modern commercial boiler and the key performance parameters.
The installation of Energys’ dynamic burner-management units (DBMUs) on boilers in two schools in Plymouth is expected to repay its £4400 supply and installation costs of in about 2.5 years. and reduce CO2 emissions by 9.45 t per year. The schools are Hyde Park Juniors and Hyde Park Infants. These DBMUs can be installed in as little as half an hour, and the work at these schools was carried out during the course of a single half day.
Stuart Turner of Hamworthy Heating looks at the replacement of boilers in commercial buildings and why a straight swap-in swap-out solution does not always present best value for money.
Stephen O’Neil of EOGB Energy Products looks at how significant efficiencies in heating systems can be delivered by optimising burner controls.
Viessmann now offers boilers with WiFi and Internet connectivity, enabling installers to respond promptly to automatic fault notifications, with the added convenience of remote performance monitoring and online service planning. Unlike previous connectivity technology, which linked end users’ smartphones with thermostats, this is said to be the first to connect directly with a domestic boiler and the first to remotely provide installers with comprehensive diagnostics data.
The replacement of existing CHP plant at Bedford Hospital includes boilers supplied by Mikrofill. The three Ethos boilers each have an output of 130 kW and will primarily serve the hospital’s HWS demand. They are configured to provide heat into the main system when hot-water requirements are at a minimum.
Investing in chemical water treatment for heating systems makes long-term financial sense — both to maximise energy efficiency and protect equipment, especially boilers. Neville Small of Potterton Commercial takes up the case.
Are you a devotee of wall-hung boilers or is floor-standing more your thing? With today’s boilers offering increased versatility and flexibility in system design, the modern plant room is benefitting from a major makeover. James Porter of Remeha Commercial, looks at the growing options to meet increased heat output demand within the tight constraints of the modern plant room.
Ideal Commercial Boilers has extended its range of Imax Xtra EL of floor-standing boilers with models offering outputs from 715 to 1240 kW. The range now comprises 10 models with outputs from 320 to 1240 kW. These new boilers expand the flexibility of the range while retaining a compact size that enables them to pass through standard doorways. The range outperforms the 2015 ErP requirements and offers very low NOx Class 6 performance for maximum BREEAM points.
ATAG Commercial’s Q Series range of boilers are designed for larger homes, commercial applications and properties with high hot-water demands. They have stainless-steel heat exchanger. There are three combination boilers with outputs of 25, 38 and 51 kW. There are also four system versions with outputs of 25, 38, 51 and 60 kW.
The Strathmore Hotel Group, which has hotels in northern England and Scotland, has installed wood pellet boilers to provide heating and hot water for seven hotels. The 36 BioWin Excel boilers from Windhager’s commercial range were installed by Green Guru of Newcastle to replace fossil-fuelled boilers.
Remeha Quinta Pro boilers contributed to a £3000 reduction in gas consumption in just four months at Sandbach School in Cheshire, despite having a greater heat output to meet its present-day requirements. Founded in 1677, it is now a free school with over 1300 students. The new boiler installation comprises six 115 kW boilers in cascade configuration.
Riello has introduced low-NOx (less than 80 mg/kWh) ‘blue-flame’ versions to all sizes of its RS range of burners. The use of a low-NOx combustion head ensures emissions conform to EN676 Class 3 in capacities from 3600 to 6260 kW.
Condensing boilers have been mandatory in the domestic market for over a decade, but it is only recently that the introduction of the Energy related Products (ErP) Directive has seen the commercial sector follow suit. Pete Mills of Bosch Commercial & Industrial Heating explains what the new requirements will mean for commercial boiler installations.
Hoval’s TopTronic system controller for Hoval boilers, calorifiers, heat pumps and other heat sources can control one or more multiple conventional and low-carbon heat sources with a single unit or in cascades of up to eight units. It eliminates the inconvenience and risk of trying to work with different controls for different appliances and system configurations.
Evinox’s ModuSat heat interface units (HIUs) have been independently tested by BSRIA and surpassed the benchmark requirements set out in the CIBSE ‘Heat network code of practice’ for both duty and return-temperature performance. The results demonstrate that ModuSat units can achieve a ∆T of up to 65 K between flow and return temperatures, thus optimising the efficiency of a heat network.
Sentinel Commercial’s Condensafe C4000 device is designed to neutralise condensation from commercial condensing boilers. It is designed to fit into a standard 40 mm ABS/PVCu waste pipe drain and is fitted with universal couplers to accommodate all makes of plastic pipe with a diameter of 40 mm.
Heating and hot-water services for 54 flats and communal areas in sheltered accommodation in Bath can now meet the demand following an increase in the size of the gas-supply pipework, which was inadequate before, and the installation of two Remeha Gas 210 Eco Pro 4-section condensing boilers and two direct gas-fired water heaters. Combe Park Almshouse is the latest addition to the St John’s Hospital’s portfolio of almshouses.
As district heating increases in popularity it is important to pay close attention to every aspect of the system design if optimum performance is to be achieved. Geoff Lord of Hoval explains.
Advance Appliances has updated its SFUTS multi-fuel thermal store by fitting and pre-wiring two electronic timers to it. The first timer is for the boiler to avoid overnight firing. The second is for the wood-burner input, with the timer turning off the pump on this circuit so that all the captured heat is kept in the store and not recirculated through the wood burner.
Hampshire’s first ‘super school’ has its heating and hot-water requirements met by a number of boilers from Mikrofill. They comprise numerous Ethos wall-mounted 90 and 110 kW condensing boilers.
Trying to plan for five, 10, or 15 years from now is tough in any business — but never more so when the heat is on to specify and build a commercial project to time and budget. However, making smart choices at the design stage is vital to cost efficiencies and, ultimately, return on investment. Neville Small at Potterton Commercial, explains why investing in quality products and equipment makes for a better project in the long run.
On paper at least, 2016 should be a ‘business as usual’ year for the commercial heating sector, but could this be the year where we see boilers specified in a new way? Could they now take on a supporting role to alternative heating technologies such as CHP? If so, what are the key elements of a system to consider? Gavin Watson of Elco UK, looks at the options.
With gas looking to be an even more important fuel for generating electricity, James Porter of Remeha Commercial, examines the role of the condensing boiler in making the UK’s gas supplies go further.
Andrew Dabin of Ideal Commercial Boilers, reflects on the challenges facing building-services engineers who are undertaking boiler retrofit projects post-ErP and how manufacturers can help uncover solutions that will minimise capital outlay whilst delivering a high-efficiency heating system.
A Scottish hotel on the banks of Loch Ness has slashed its heating and hot-water costs following the installation of two wood-pellet boilers to completely replace LPG boilers and electric storage heaters. The combination of fuel-cost savings and payments from the Renewable Heat Incentive (RHI) amounts to about £26 700 a year and are almost evenly split.
Preventing boiler dry cycling at the King’s Cross Hospital in Dundee has achieved average fuel savings of 7% with a payback of 1.8 years. Sabien Technology verified the savings for its M2G boiler-load optimisation controls for NHS Tayside.
Technologies such as combined heat and power and biomass boilers should not be regarded as distractions to ensuring that the gas-fired boiler plant that is still required operates as part of an efficient system — even before other technologies are added. Stuart Turner of Hamworthy Heating gives an insight.
- 07 - 09 March, 2017Ecobuild
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