TEMPERATURE CONTROL
a special valve (Fig. 4) which combines the functions of flushing, regulating, and shut- off.
Conclusion
To reduce the ambient heat transfer to cold water systems, the first step should be to employ all available passive thermal decoupling measures. Even with good thermal decoupling measures, however, during the summer months with incoming water temperatures of above 20˚C and room air temperatures over 25˚C, the temperature of cold water must be expected to rise to above 25˚C. DVGW water information document 90, BS 8558, HTM04-01, and other international regulations agree that a ‘safe’ temperature for cold water, (including to prevent the growth and proliferation of potentially harmful waterborne bacteria) is below 20˚C. Passive measures alone are not sufficient to achieve this.
Figure 4: A KHS CoolFlow cold water regulating valve.
powerful and cost-effective solution. With the Kemper CoolFlow System, a predetermined temperature for cold water of below 20˚C can be ensured at any time, right up to each tap/outlet, even in the summer months, and without the water losses seen with temperature based flushing. By combining this technology with effective water circulation, healthcare estates teams can ensure effective water hygiene. Indeed, such solutions can be considered an essential part of a proactive, preventive regime designed to address
any hygiene issues within healthcare water services. We strongly recommend that planners and manufacturers agree clearly, early on, with the client which temperature requirements for cold drinking water must be met, after which appropriate passive and active measures need to be planned and implemented in a structured and effective manner.
An active process is therefore required to ensure that a ‘safe’ temperature limit for cold water is achieved by the operator at any time. Cold water circulation and cooling, combined with a Flow-Splitter installation, are recommended as a
in community composition. Water Res 2010; 44 (17): 4868-77.
2 BS EN 16421:2015-01-31. Influence of materials on water for human consumption. Enhancement of microbial growth (EMG).
3 The Water Supply (Water Fittings) Regulations 1999.
4 Flemming C, Kistemann T, Bendinger B et al. Erkenntnisse aus dem BMBF- Verbundprojekt, Biofilme in der Trinkwasserinstallation. Bundesministerium für Bildung und Forschung, 2010.
https://tinyurl.com/y5bfmyxz
5 DVGW-Information WASSER Nr. 90 Informationen und Erläuterungen zu Anforderungen des DVGW- Arbeitsblattes W 551 (July 2016).
https://tinyurl.com/yyxjodwf
6 BS 8558: 2011. Guide to the design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages – Complementary guidance to BS EN 806.
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References 1 Lautenschlager K, Boon N, Yingying W, Egli T, Hammes F. Overnight stagnation of drinking water in household taps induces microbial growth and changes
7 Health Technical Memorandum 04-01: Safe water in healthcare premises: Part A – Design, installation and commissioning. Department of Health and Social Care, October 2016.
8 BS 5422: 2009. Method for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range –40˚C to +700˚C.
Chris Rhodes
Chris Rhodes, associate director, is the Business director for Gebr. Kemper UK & Ireland, having held this position since 2009, and been involved with Kemper GmbH since its first steps into the valve market in the UK back in 1999. He has also worked for the Metals Division of Kemper covering the UK and Ireland, and still covers this market for the business today. He introduced the Kemper Hygiene technology, KHS, into the UK back in 2004, and from the initial trials, which he says were ‘a huge success', the system is now being installed into many healthcare premises across both the UK and Ireland.
Frank Schmidt
Dipl.-Ing. Frank Schmidt M.Eng is International Market developer at Gebr. Kemper GmbH + Co. KG. His passion is to share plumbing design experience on international markets, and to learn about plumbing design and installation solutions from other countries. In the past 10 years, he has supported many plumbing installation projects worldwide, and has given seminars and presentations in over 15 countries. His career in plumbing began 25 years ago, when he started an apprenticeship to become a certified plumber. He graduated with a Dipl.-Ing. in Building Technology, and with a M.Eng qualification in Technical Management from the University of Münster in Germany.
Timo Kirchhoff
After completing his training as a plumber, Timo Kirchhoff, M.Eng, head of Product Management at Gebr. Kemper GmbH + Co. KG, graduated with a B.Eng. Building Services degree, and an M.Eng. Technical Management qualification, at the University of Applied Sciences in Münster, Germany. He started working for Gebr. Kemper as a Product manager eight years ago, becoming head of Product Management in 2017. He has written more than 80 technical articles on drinking water hygiene and installation technology.
November 2020 Health Estate Journal 73
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