BSEE BOILERS & HOT WATER
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WHEN SPACE IS AN ISSUE You need a flexible friend
In addition to achieving high efficiencies, heating products must increasingly offer enhanced design flexibility to overcome plantroom restrictions. Adrian Morris, Product Manager at Remeha, looks at how the latest condensing boilers are exceeding expectation.
H
eating and hot water provision is a critical service in a building, ensuring its continuous operation. However, it also typically accounts
for a large proportion of its total energy consumption, so it’s critical that the system operates as efficiently as possible.
Commercial boilers are the heartbeat of many non-domestic buildings, whether the sole provider of heating or a crucial component in a multi- technology system. But just how efficient are they?
Regular servicing and maintenance will optimise boiler performance. Yet, even with good maintenance programmes, a 25-year-old boiler will achieve a maximum gross efficiency of around 70% at best and high NOx emissions.
Compare this with the latest condensing boilers that deliver near maximum efficiencies and ultra-low emissions and it’s clear that boiler replacement programmes should be part of any energy reduction strategy. The challenge for building services engineers is how to achieve the required heat output in the increasingly restricted space available in plantrooms. It’s an issue that forward- thinking manufacturers have sought to address through continued research, innovation and evolution of boiler technology. The result is a series of advanced condensing boilers that meet the market demand for high-efficiency and low NOx emissions in a neater, more flexible form.
Size matters
In the world of boilers, size really does matter – and it’s a case of the smaller the better.
Take wall-hung boilers, the popular option for projects requiring lower heat outputs. Now even lighter and more compact than before, the latest condensing boiler models are easier to lift and position for faster installation. Some manufacturers have extended the range with wall-hung boilers that deliver an output up to 160 kW.
This welcome addition provides consultants and contractors with new opportunity to move large outputs away from the floor and onto the wall. On projects requiring high heat output, floor-standing boilers are traditionally the boiler of choice. Again, size is a key concern. Our research has revealed a demand for more lightweight, compact boiler models to meet the need for greater kilowatt output per square metre.
And here, too, manufacturers have innovated to set new industry standards in terms of performance and design. The latest models of floor-standing boilers are less than half the size of their predecessors, making them easier to handle, slim enough to fit through standard doorways – and as a result, faster to install. An added advantage of the reduced footprint is the ability to install these new models in parallel with the boilers they are replacing, switching them over in a live environment. Then there are the little details that make all the difference, such as integral wheels for smoother manoeuvrability into and around the plant room and the ability to dismantle a boiler into parts to overcome problems of access.
Flexible, space‐saving configurations
Reducing the boiler footprint is the first step to overcoming plantroom space constraints. The second is to reduce the installed space.
Specifying multiple boilers rather than a single larger unit is an effective means of delivering high outputs with a large turndown ratio. The configuration allows the heat demand of a building to be matched more accurately, improving the overall efficiency of the heating system. At the same time, the inbuilt redundancy improves heating security while enabling easier maintenance and future replacement.
To minimise the installed space of floor- standing boilers, manufacturers like Remeha have looked to enhance their flexibility. This has led to moving all the connections – water, flue and gas – to the top of the boiler. It’s a deceptively simple adjustment that enables the multiple boilers to be positioned side-by- side or back-to-back in space-saving modular configurations.
Operating in cascade
The ability to install multiple boilers on cascade packages gives designers even wider choice.
uWith the arrival of wall‐hung boilers offering outputs of 160kW, there is a new opportunity to move equipment away from the floor and onto the wall. This provided a quality solution to high heat output in the tiny plant room at St Davids Cathedral, especially with the option for easy‐to‐install cascade systems.
14 BUILDING SERVICES & ENVIRONMENTAL ENGINEER JULY 2017
Installing boilers on a cascade system is a straightforward, popular solution to achieving rapid, high-efficiency heating provision. Many manufacturers provide comprehensive prefabricated cascade packages that reduce on-site labour, skills and hot works. The numerous benefits include standby capability, a better turndown ratio, quick and easy installation – and improved flexibility. Typically, cascade packages have applied to wall-hung boilers and as such were suited to buildings with lower heat output requirements. This was extended
uBoiler size matters more than ever as plant room space continues to shrink. That’s what influenced the development of Remeha’s Gas 220 Ace, the new floor‐standing condensing boiler range that offers high output to physical size ratio. The Gas 220 Ace features a new, advanced monobloc aluminium heat exchanger that is almost half the size of previous models at its top end output (300kW). Clever design enables space‐saving side‐by‐side and back‐to‐back modular configurations.
last year to include large output wall-hung boilers.
And now contractors and consultants can choose cascade options for high output floor-standing boilers up to 300kW. Remeha’s new Gas 220 Ace cascade packages, for example, are available for up to four boilers in-line and up to eight boilers in a back-to- back arrangement.
The ultra-compact dimensions of the boilers, combined with the smart gas and water connection technology of the cascade system, makes it possible to install a high heat output of up to 2.4MW in just 5.6m2. The impressively small footprint still enables easy access to all eight boilers – with no lifting or stacking of heat exchangers required. With the latest condensing boiler models, high efficiencies and low NOx operation is a given. But in addition, they provide contractors and consultants with wider possibilities, enabling them to consider different ways to achieve required outputs and helping to reduce energy waste. Easy to fit, easy to connect and with inbuilt design flexibility, they offer winning solutions – whatever the size of the plantroom.
www.remeha.co.uk VISIT OUR WEBSITE:
www.bsee.co.uk ‘ The challenge
for building services engineers is how to achieve the required heat output in the increasingly restricted space available in plantrooms. It’s an issue that forward‐thinking manufacturers have sought to address.
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