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Tuesday, June 28, 2022

Frese endorses BSRIA Guide

Frese main
Frese UK has given it??s backing to a new BSRIA Guide which explains how to correctly select and size control valves in variable flow systems.


As a pioneer of pressure independent flow and temperature control valves since 1988, Frese has been convinced of the energy saving and comfort control benefits this technology can deliver in hydronic heating and cooling systems for more than 25 years.


Adoption of this technology has accelerated over the last three years as building services engineers, owners and operators have quickly come to understand the potential benefits of this technology when used in variable flow heating and cooling systems.


BSRIA has issued a new guide, BG 51/2014 Selection of Control Valves in Variable Flow Systems, as a follow-up to its test standard BTS 1/2012 Test Method for Pressure Independent Control Valves in order to address a skills gap in the industry this rapid uptake has exposed.


Some issues have occurred because there is no common format for presetting and performance of Pressure Independent Control Valves (PICVs) or independent guidance on their selection.


Selection of Control Valves in Variable Flow Systems is now available to download from www.bsria.co.uk and explains how to correctly select and size conventional two, three and four port or pressure independent control valves for the direct and indirect control of terminal devices such as radiators, fan coil units, air handling units, chilled beams, trench heaters, plate heat exchangers and calorifiers.


Stephen Hart, Managing Diretor, Frese UK said, ?The guide encourages the proper sizing of control valves in order to improve comfort control by avoiding excessive temperature variations in the controlled media and improve control of system temperature differential, achieving and maintaining the required system delta T under all operating conditions??This clearly supports initiatives such as seasonal and continuous commissioning which emphasises the need for hydronic heating and cooling systems to be balanced at all load conditions, not just peak.


?Frese has always held the view that the most important benefit of pressure independent flow and temperature control valves is their ability to prevent excessive flows through terminal branches and bypasses at building part load operating condition.


?This means they avoid ??low delta T syndrome?? which can significantly reduce operating efficiencies of heating and cooling sources such as condensing boilers, chillers, CHP engines and heat pumps.??


A number of case studies conducted by Frese in Denmark, Germany and at Canary Wharf in the UK have shown the potential energy and carbon savings resulting from maximised delta T across heating and cooling sources. Through the correct application of pressure independent flow and temperature control valves pump energy consumption reductions can double, as detailed in the BSRIA guide BG 12/2011 Energy Efficient Pumping Systems.

?Control valves designs differ widely and care should be taken to select the correct product for the correct application,?? said Stephen. ?But it is even more important to understand and apply the correct selection and sizing method to ensure good comfort and delta T control of hydronic heating and cooling systems.


?For this reason, Frese believes that BG 51/2014 Selection of Control Valves in Variable Flow Systems is an invaluable new publication from BSRIA that any building services engineer should refer to when designing energy efficient variable flow systems.??


01704 896012 | www.frese.co.uk





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