Variable-flow systems have the potential to reduce pumping energy significantly, but only with the right kind of balancing valves — properly used. Martyn Neil of Danfoss explores the role of differential-pressure control valves in the energy performance of commercial HVAC systems.
An energy-efficient heating system should be at the top of the agenda for any building-services professional. However, improving the efficiency of a heating system is about more than just installing a high-efficiency boiler, as Steven Evans of Potterton Commercial, explains.
Heating and hot water for the Richmond Villages retirement complex in Ashton-on-Trent is provided by InTec 34C combination boilers from Alpha Heating Innovation. The development by Richmond Villages is designed so that residents can enjoy an independent and full lifestyle.
The failing cast-iron drainage system in the 25-storey Millbrook Tower in Southampton has been replaced using a high-density polyethylene system that was installed without the temporary re-homing of any residents. Built over 50 years ago and formerly the tallest building in Southampton, it has a cast-iron drainage system that had started to rust.
Rinnai’s Infinity range of A-rated continuous-flow gas-fired water heaters, are well suited for small business and domestic properties that require high volumes of water at intermittent times of the day. The water is delivered at accurate temperatures for optimum user comfort and safety. Applications include cafes, pubs, restaurants, offices, shops, hairdressers, small commercial units, caravan parks and leisure facilities.
Potterton Commercial has made its easier for installers working on light-commercial project with the introduction of its best-value 50 kW Paramount Four boiler and flue offer. For a limited time, contractors can get a free horizontal or vertical flue when they purchase the boiler.
Evinox’s ModuSat heat interface unit takes around 15 seconds to reach 55°C from the tap opening, providing an impressive dynamic response. PID control logic, in combination with PICVs and a fast-acting actuator, modulates the primary flow rate to match the demand for hot water or heating demand, with very rapid response to changing loads.
Over the next two years, legislative changes will drive manufacturers to design even more energy-efficient water heaters. Here, Jonathan Tedstone of Andrews Water Heaters looks at what’s in store.
Xylem has extended its Ecocirc XL and XLplus range of wet-rotor circulator pumps, enabling increased energy savings for commercial HVAC users. There are two new product groups for hot and cold HVAC applications.
Micronic flowmeters have been used at Heathrow Airport’s Terminal 4 to survey energy usage in the heating system. The facilities staff at the terminal have a 5-year plan running to 2019, entitled Quinquennium 6, which includes the redesign of the medium-temperature hot-water system, which previously ran at 120°C. The requirement was to run the system at a lower temperature to be more cost effective, more environmentally friendly and — crucially — safer.
Marflow Hydronics has further developed its web site to enable customers to download relevant technical information, including BIM models, via a new product-downloads section. In addition, all product pages can be captured in PDF format and used as a data sheet.
Underfloor heating for a new extension block at a school in north London was designed, supplied and installed by Oventrop Projects. The school is La Sainte Union Catholic Girls School and sixth-form college, and the project was carried out on behalf of RN Plumbing & Heating for the ground and first floors.
Sabien Technology is the exclusive UK distributor for the Endotherm energy-saving heating additive for commercial multi-site heating systems. The agreement with Endo Enterprises (UK) is to supply the additive, which has won a CIBSE award, for commercial boiler heating systems.
Viega now offers its Megapress press-in connection in the UK. The system makes it a simple job to add extra sensors, thermometers, drainage valves or pipe connections to thick-walled pipe. A press-in connection can be installed in a couple of minutes, with an estimated time saving of 80% compared to welding a connection.
The supply of hot water for the Malvern Hills Caravan Club site is now plentiful and consistent following the installation of four Rinnai continuous-flow water heaters to replace two storage water heaters. The site has 210 pitches and is especially busy from Easter right through to October.
Identifying installation issues with pipework at the commissioning stage is vital to prevent time–consuming remedial work after the fit out is complete. Scott James of Viega UK looks at what to consider when specifying pipework and how modern installation methods can help save time and money during and after the project.
An energy check carried out by Grundfos Pumps on an 11 000-student campus at a university in the north west of England highlighted potential energy savings of over 64 MWh a year, with a return on investment of just three years. The savings were achieved by exchanging a number of circulators for more efficient models.
Bristol Airport has gone beyond basic requirements in its suitability for use by people with disabilities by installing a Clos-o-Mat Palma Vita wash-and-dry toilet in place of a conventional peninsular WC. The facility measures 3 x 4 m and includes a height-adjustable adult-sized changing bench and ceiling track hoist that are key to a compliant Changing Places.
Water-treatment regulations and product standards are almost entirely absent in the non-domestic market. Chris Shelton of Sentinel Commercial explains the financial and operational benefits of proactively embracing a best practice approach to water treatment — and how it can be easily and cost-effectively implemented.
Viega press fittings are now available in the UK with SC-Contur technology for pipe connections from 12 to 108 mm. SC-Contur technology provides a flowpath within the fitting that leaks slightly if the fitting is inadvertently unpressed. Water will visibly escape from unpressed connections when the system pressure is between 1 and 6.5 bar. For dry testing with inert gas, a measurable drop in pressure will occur between 22 mbar and 3 bar.
Belimo’s replacement actuators for globe valves have customisable parameters and are equipped with a universal valve neck and stem adapter. They can be installed quickly and easily on virtually all valves from manufacturers worldwide.
Faced with less and less space being available for piped services, how can designers respond. Paul Wightman of Albion Valves shares some ideas — ideas that can also improve the operation and response of those systems.
The British Pump Manufacturers’ Association offers a one-day course dealing with pump systems. It examines the factors that should be considered when designing a pump system. It uses a combination of presentations and exercises in a practical approach to what is a complex subject.
Kingspan Kooltherm FM pipe insulation has been evaluated under the BRE’s Green Guide ratings table and methodology for pipe insulation. This new approach has been designed to provide a more accurate assessment of the environmental impact of pipe insulation in-situ. The FM pipe-insulation system received the highest summary ratings of A and A+.
Xylem’s extended Lowara e-series global range of pumps includes highly efficient in-line and end-suction pumps that exceed the 2015 European Ecodesign requirements of a minimum efficiency index (MEI) of no lower than 0.4. In many cases, e-series pumps have an MEI greater than 0.7. The range extension adds 29 in-line single and twin pumps, including models with stainless-steel and duplex bodies, more sizes and 60 Hz models. The updated series covers a new set of duty points, making it suitable for a wider range of HVAC and industrial applications.
Traditionally, vast quantities of clean, potable water are discharged to drain during the dynamic flushing procedure that is part of the pre-commission cleaning process of a closed pipework system. Up to 20 times the system volume may be required, which has to be discharged to drain.
In response to consumer trends, Francis Pegler offers a range of brushed-nickel taps. Mike Johnson, washroom market manager for Pegler Yorkshire, explains, ‘More and more consumers are wanting to step away from the high shine that chrome offers and prefer a more muted style that perfectly complements cookware and kitchen appliances often found in brushed textures.’
When a leading UK manufacturer of beverage cans wanted to investigate the potential for saving energy on its installed pumps systems, it approached Grundfos to undertake an energy check. It focused on the washing lines, and a comprehensive report was produced, as a result of which a number of pumps were replaced.
Residents of luxury apartments at The Franklin in Bournville, Birmingham have their heating and hot water provided by Nexus Futura IS heat interface units (HIUs) from Elco Heating Solutions. 79 HIUs have been installed as part of a network heating systems. They are connected to three Elco R603 floor-standing boilers in a centralised plant room.
Rinnai’s Infinity Plus Cascade system offers a solution for providing hot water in larger commercial premises. These custom-made solutions are based on modules incorporating 1500 or 1200 condensing units with Rinnai’s newly developed common-heating flue-system technology. Any number of modules can be manifolded together.
Pumps that do not comply with UK and European standards entering the UK are a major concern to the pump industry, and their use is fraught with risk. Peter Reynolds, president of the British Pump Manufacturers Association, explains what is being done to tackle the problem.
Sanha press-fit technology for pipes has been used by Woodtek Energy, a leading manufacture of drying machines for wood chips, in its biomass heating systems. The Nirosan press system has consistently saved substantial time and labour for Woodtek, and director and co-founder Stuart Jones explains, ‘The labour savings are significant. What used to take five days in traditional piping systems now only takes two with the Sanha press system.’
Steven Mesher of REMS (UK) looks at the requirement for the avoidance/ removal of bacterial contamination during the commissioning of potable-water installations and how it impacts on the installer.
Sentinel Commercial’s KalGuard electrolytic scale inhibitor is proving to be an effective long-term solution in tackling a loud banging noise that started to come from a of hot-water boiler when it was just five years old. The noise, known as kettling, is caused by an accumulation of limescale deposits on a heat exchanger. A KalGuard unit was installed in 2005, and its anode has been replaced only once — in 2010. The current anode still has 25% life.
The building-services systems of the new £237 million Alder Hey Children’s Hospital in Liverpool includes over 70 Grundfos speed-controlled pumps and booster sets, as well as pressurisation units and ancillary equipment. The system is supported by BACnet technology, a communications protocol used by building-management systems worldwide.
Many of the problems associated with controlling legionella bacteria in domestic- hot-water systems can be solved by choosing to install a gas-fired continuous-flow system, explains Chris Goggin, associate director with Rinnai UK.
Belimo’s replacement actuator for globe valves have customisable parameters and are equipped with a universal valve neck and stem adapter. They can be installed quickly and easily on virtually all valves from manufacturers worldwide.
Grundfos Pumps offers a range of diagnostic tools on its web site, Including ‘Energy check’ and ‘Pump audit’. Not only will they establish the performance of a current pump system, but they also provide reports with details on potential savings and payback period, as well as various pump options.
Additions to the Acvatix range of ball valves from Siemens Building Technologies enables the company to offer valves in sizes from 15 to 50 mm with internal and external threads. These valves are suitable for hot- and cold-water systems and have been designed for robust performance and easy installation.
Maintaining the low system temperatures required for efficient operation of heat networks presents a design challenge for building-services engineers. Silas Flytkjaer of SAV Systems highlights the importance of effective temperature and pressure control.
Danfoss describes its Hero flushing bypass manifold as a time-, cost- and space-saving solution that features all the main components needed to install, flush, balance, control and maintain terminal units in HVAC system with variable flow. A cost analysis by the company showed that Hero can achieve a 23% saving in time and cost during installation compared with an option assembled on site.
The refurbishment of the Holiday Inn Express hotel at Edinburgh Airport has its hot-water requirements met by Oventrop Regumaq Cascade units. There are four wall-hung units that heat cold water as required by drawing heat from thermal stores — in this case two electrically heated buffer tanks — through a plate heat exchanger.
This installation of Rinnai direct-fired water heaters at a country club and spa is part of a decentralised system comprising 17 A-rated gas-fired condensing units capable of delivering 20 000 l/h of temperature-controlled hot water. Installed at the Hale Country Club & Spa in Cheshire, the 1500i units serve executive soaker showers, poolside showers and changing-room showers.
To reduce the heat transference from service pipework in 20 Fenchurch Street, London (the ‘Walkie Talkie’ building) 20 000 linear metres of Kingspan Kooltherm FM pipe insulation has been installed, helping to achieve a BREEAM ‘Excellent’ rating and a post-construction score of 80.2%. The building offers 63 000 m2 of office space and is topped with a massive sky garden. The well known concave design was created by Rafael Viñoly.
Pegler Yorkshire’s Warranty Plus initiative covers complete pipework systems, rather than individual components. It was created after in-depth research with contractors showed the need for such a warranty, which took two years to develop. The scheme is designed to ensure more efficient installations and provide reassurance for many years. The 3-stage process offers support for projects over £250 000.
Evinox Energy will be featuring its expertise in communal and district heating at Ecobuild (see below). The company makes its own range of modern heat interface units (HIUs) designed with efficiency and end-user comfort in mind. The company also offers metering and billing solutions, and smart control technology.
Measuring the head losses and pump-duty requirements of plastic pipework revealed some amazing results. Des Dolan of Durapipe discusses the findings.
Hot water for a new toilet and shower block at the Sunbourne Glan y Mor Leisure Park in west Wales is provided by two Rinnai Infinity HDC 1500 continuous-flow units. The facilities cater for campers and touring caravans and also include a launderette.