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tem works by a pump circulating the hot water from the water tank and to the final consumer. This ensures that the water temperature stays at an acceptable level, even at times with little or no demand at point of use.
The challenge in these applications is to minimise the losses in the system. The “losses” consist of heat loss from pipes in typically unoccupied areas of the building and energy loss due to uncontrolled pumps. Energy loss when circulating the hot water typically varies between 30 to 75 per cent in high-rise domestic buildings and 50 to 90 per cent in commercial buildings and schools. There have been examples of the loss constituting from two to over 100 times the energy consumption used heating the water.
It is therefore obvious that the potential for energy savings in this system is enormous. The following examples show three different approaches to solving the hot water recirculation task. Examples two and three (on page 40) show how it is possible to utilise the built-in temperature sensor in the MAGNA3. TemperaTure conTrol To reduce losses
Traditionally, HWR has been handled by a recirculation pump responsible for maintaining a constant duty point, or more economically, a variable circulating flow in combination with thermostatic valves to set a minimum return temperature.
With the MAGNA3 it is now also possible to do without these valves as the temperature control is performed by the MAGNA3 and its built-in temperature sensor. However, balancing valves are still needed unless decentralised MAGNA3 pumps are utilised.
Benefits of the MAGNA3 in HWR: • Reduced heat losses from pipes • Easy commissioning via Grundfos GO • Reduced initial cost (no termostatic valves)
With the Grundfos Go app for both iPhone and Android, it is very easy to set up the temperature control on the MAGNA3, as seen from the screenshots at right. For more information, visit http://ca.grundfos.com/. b
B.G.E. Service & Supply Ltd. ........................................ 11 Belimo Americas............................................................ 32
Craven Huston Powers Architects................................ 38
Fortis B.C.......................................................................IFC
IBC Technologies ...................................................... 4, 21 Interior Turf Equipment ................................................ 33 J.M. Bean & Co Ltd. ...................................................... 30
Korolite Engineered Panel Structures Ltd. C/o Massonville Plastics Ltd. & Group Of Companies....... 37 McGregor Hardware Distribution ................................ 19 Ram Mechanical Ltd...................................................... 32
Refrigerative Supply Ltd................................................29 Reliable Controls Corporation ................................... IBC Roofing Contractors Association of B.C...................... 17 Royal Stewart Ltd........................................................... 18 Schoolhouse Products .................................................. 25
Soprema Inc. .................................................................. 39 Spears Sales & Service Ltd............................................32 Viessmann Manufacturing Company Inc..................... 35 Wesclean Equipment & Cleaning Supplies Ltd.......... 23 WEsCO distribution/Philips Lighting............................ 7 Western Bus Parts & Services Ltd. ............................... 27
Quality, built in.
You’re in safe hands With a solution from ESC Automation, you can be safe in the knowledge that your building automation system is being taken care of by experts. We deliver a comprehensive and meticulous service, from installation to maintenance, ensuring you get a solution that’s right for your building. A Delta Controls system through ESC or one of its Partners, means you can manage operating costs effectively by identifying inefficiencies and acting upon them (even remotely) to keep your buildings running smoothly and reduce your energy costs. Visit our website for more information www.escautomation.com or call us now on (604) 574-7790
