Stokvis delivering safe and simple hot water


An eight year programme of improvement work carried out across a wide diversity of buildings occupied by the University of Liverpool on three separate campuses has seen Stokvis Energy Systems supplying its plate heat exchangers to guarantee both the quality and security of the domestic hot water provision. Dozens of Econoplate units have been installed in students halls of residences, lecture buildings and administrative offices located on the city centre, Sefton Park and Leahurst Campus site. They have been used either in combination with buffer vessels or directly, accurately delivering plentiful hot water and cutting the risk of contamination from the Legionella bacteria.


While all of the contracts have been carried out in conjunction with three leading M&E consultants, the University of Liverpool’s own Facilities Management Department has been in overall charge. The Senior Mechanical Engineer, Dave


Dutton, comments: “Stokvis is on the university’s list of approved suppliers and the Econoplate plate heat exchanges have proved ideal for meeting the sort of demands we have to deal with. In common with certain other types of building, the halls of residence experience some very high peaks in the morning and when lectures finish. The reliability has been good and replacing the old hot water systems with Econoplate units has also freed up a lot of space in the plant rooms.” Econoplate plate heat exchangers offer a high performance, low maintenance means of providing plentiful hot water in a wide variety of locations including hotels, hospitals and commercial buildings, as well as industrial premises where they are often specified to generate process water. They are ideal for installation in combination with Stokvis Energy Systems Econoflame and Economatic boiler range and frequently feature in the “Heatpak” pre-packaged plant rooms it also offers. Email: info@stokvisboilers.com www.stokvisboilers.com


‘All creatures great and small’ benefit from fresh environment


An air conditioning system designed by Weatherite Building Services is helping to create the ideal environment at a renowned veterinary hospital. EC Straiton & Partners Veterinary Hospital in Penkridge is one of Staffordshire’s largest and most well- respected mixed animal practices. It was founded in 1942 by the late Eddie Straiton, the original ‘TV Vet’ who also acted as an advisor to the ‘All Creatures Great & Small’ TV series.


The practice offers a complete surgical service and has extensive diagnostic facilities. Weatherite’s challenge was to design and install an air conditioning system that would maintain a comfortable working environment, without disruption to the practice or its patients. The system comprises ten wall-


mounted Hitachi units in the clients waiting area, reception, pharmacy, lab, five consulting rooms and the main office area. The Hitachi models were chosen for their energy saving capabilities, reliability and reputation as one of the best on the market. They deliver virtually silent operation and smooth, multi-directional air distribution and use environmentally friendly refrigerant.


Martin Thomas, sales director, Weatherite Building Services, commented: “We are delighted we could complete the work in this busy practice within normal working hours and without disruption to the client or its customers. We were able to offer a cost-effective solution and develop a good relationship that instilled confidence in the customer. “ WBS has over 38 years experience in all aspects of building service including heating, ventilation, air conditioning, commercial kitchen ventilation/extraction, data centre/IT cooling, boiler house refurbishment/replacement and all aspects of M & E services. WBS offers its customers a complete building services solution-from one single source including total project management and full design, installation and commissioning activities. www.weatheritegroup.com


24 energy solutions


ABB drives save £20,000 energy costs


Operators of a prestigious office building in Reigate, Surrey, are saving £20,000 a year on energy costs for the building’s HVAC system following the installation of ABB standard drives for HVAC.


The Omnibus building was completed in 2001. Based on a disused bus garage in the centre of the town, the building is a multi-tenant facility offering over 65,000 sq ft of office space.


Econowise Drives and Controls, based in Redhill, specialises in supplying and installing VSDs for HVAC applications, as well as motors and other equipment for buildings in London and the Home Counties. After getting the go ahead from NB Entrust Ltd, Econowise conducted an energy appraisal of the existing system. Dave Lapsley, owner and director of Econowise, says: “The energy appraisal revealed that the motors driving the system pumps were all running at full speed, with flow control achieved by mechanical throttling. We calculated that putting VSDs on the application could save around £20,000 per annum in energy costs.”


Econowise installed twelve ABB standard drives for HVAC, six on the chiller pumps rated at 15 kW, four on the LPHW secondary heating pumps rated at 15 kW and two on the LPHW Primary pumps rated at 7.5 kW. Econowise opened all the valves and set the drives to maximum speed, reducing the speed until the water flow rate met the exact requirements of the building as detailed in the original commissioning information. The building also had two existing VSDs operating an air handling unit but these were not running in a speed control mode. Econowise reprogrammed the PID controller on the exhaust fan drive to accept signals from a CO2


detector and


drive it at an appropriate speed to remove the CO2


. The two drives were connected so that the supply fan was driven at a speed to match the speed of the exhaust fan, hence maintaining design pressures at all times. Email: energy@gb.abb.com www.abb.co.uk/energy


Building & Facilities Management – December 2010/January 2011


HVRAC


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