086 HPM 1012

HPM October 2012

TUBES,VALVES,FITTINGS&PUMPS WWW.HPMMAG.COM Got a story? Ring us on 01732 748041 or e-mail twood@unity-media.com Energy savings and fitting flexibility Bjorn Sejr Nielsen, marketing director of Danfoss, on how TRV technology has developed over the decades... improve the efficiency of an existing system. However, although every professional heating installer will be familiar with the primary functions of the TRV, not all may be aware how this simple yet highly effective product has developed over the years. Energy saving developments in TRV technology are being driven by increasingly stringent regulations and by end-users who are struggling to afford rising energy bills. Also, with everyone talking ‘green’ it’s not surprising that products like the TRV, which reduce energy consumption and so help cut carbon emissions, have found a ready market in both the private and social housing sectors. TRV innovations in recent years have covered the full spectrum, from size and style to increased efficiency and easier installation. The latter is demonstrated in developments like the bi-directional TRV. Unlike the traditional ‘cone and seat’ type valves, which need to be fitted on the flow rather than the return side of the radiator, bi-directional valves can be installed horizontally or vertically, in flow or return, Danfoss TRVs are installed making for much more flexible positioning. And Ftheir role in energy saving is still and adjust the flow of heated water only where the wrong way round - a quick turn of the valve’snow there’s even a ‘flow-selectable’ bi-directionalvalve, offering an instant solution to thecommon problem of system noise or ‘waterhammer’. This can occur when a valve is fittedsolution. TRVs sense room temperature changesin individual rooms, including extraneous ‘freeheat’ from sunlight, appliances and occupants,irst available as long ago as 1943,thermostatic radiator valves (TRVs) are theoriginal room temperature controls and recognised today. Changes to Part L Building it’s needed through the relevant radiators. With a revolving feature and the problem is solved. Regulations, which came into force in October typical payback time of less than two years 2010, state that all new heating systems should radiator thermostats represent an attractive TEMPERATURE CONTROL now have at least two heating zones and one hot proposition that’s easy to sell to householders. However, perhaps one of the most significant water zone. In addition, each of these heating The Good Practice Guide 302, the developments in terms of energy efficiency has zones should have at least one room thermostat government’s authorative document covering been the programmable electronic TRV. These to provide boiler interlock and individual domestic heating controls, endorses the TRV as generation valves offer time and temperature radiator control such as TRVs. Apart from not an energy saving solution by recommending control for each room, contributing to lower fuel complying with building regulations, a home radiator thermostats for all ‘wet’ systems, whether bills for householders. with no heating controls is missing out on these are installed to defined ‘Minimum Set’ or Extra energy savings can also be made with significant energy savings. ‘Best Practice’ standards. innovative open-window functions, which Accurate control of room temperatures ensures The Guide - and Part L - specifies TRVs on all prevent heat being wasted by closing the valve if only essential heat is generated. Effective ‘zone radiators expect in rooms with a room the thermostat detects a significant drop in room control’ saves householders energy, and money, thermostat, which is already doing this job. temperature when a window is opened. by preventing the expensive overheating of parts However, where an automatic by-pass valve is Although TRVs are clearly becoming more of the house that are unoccupied or need to be installed in a heating system, radiator sophisticated in terms of functionality, this kept at a lower temperature, like bedrooms. It thermostats may be fitted to all radiators. Many shouldn’t be at the expense of ease of fitting and can also be used to take advantage of passive boiler manufacturers specify by-passes and use. Installers don’t want to spend hours getting solar gain in highly glazed areas such as a minimum flow rates through the boiler heat to grips with a complicated manual, and there’s conservatory, or adapt to different occupancy exchanger to maintain peak system efficiency, no point developing an all-singing all-dancing patterns in, say, a home office, which may only irrespective of load. Part L insists on the use of TRV that the average homeowner finds too be used at certain times or days of the week. automatic by-pass valves in such installations as difficult to use. Clear digital displays, Installing separate heating circuits with their a by-pass alone or manual by-pass valve is not pre-installed programmes, and simple push own programmable controls is one way to considered adequate. button operation are just some of the features of comply with Part L zoning. However, a simpler The TRV has become firmly established as an the latest electronic TRVs, and I believe we’re and more cost-effective solution is to fit TRVs energy saving heating control and thousands are likely to see further developments in the user and because they require no external power to installed in UK homes every year, either as part interface similar to those used in Smartphones operate, they are a truly ‘green’ zone control of a new heating system or an upgrade to and touch-screen devices. 86 OCTOBER 2012 HEATING & PLUMBING MONTHLY enquiry number 171


HPM October 2012
To see the actual publication please follow the link above