One of the Isle of Man’s leading tourist attractions has recently secured an award for its sustainability following the installation of a system that capitalises on the nearby river and lake.
The owners of the Salmon Lake Centre and Ballacregga Tea Rooms wanted to improve the efficiency of the site, which includes an old stone building that needs a lot of heating. The resulting upgrade secured the ‘Private Sector: Best Innovation’ award at the Isle of Man’s Energy Awards 2015.
Now the site benefits from a self-sufficient hydro-electric, central heating, air conditioning and hot water system, which can all be controlled either centrally from a PC or remotely by smart phone or tablet.
Specialist building contractor, SCS Ltd, rose to the challenge using ingenious technologies and methodology to create the award winning project.
SCS managing director, Stewart Clague, said: “Initially, we decided we could install a turbine in the nearby Laxey river to provide free electric to heat the premises, but then it occurred to us that we really should also be able to heat or cool.”
The site has an open area which is popular for functions such as weddings and meetings so needs ventilation and air conditioning.
SCS called upon the expertise of HVAC specialist supplier Kooltech and a subsequent site visit determined that if the client was to use the natural resource of the adjacent Salmon Lake, far more benefits could be gained.
“One of the biggest concerns on a project such as this is the dissipation of heat which can be generated from a system, so the logical solution was to use the Salmon Lake,” explained application engineer Alan Clarke of Kooltech. “The benefit of using the lake was that the system wouldn’t be at the mercy of the elements or have to worry about heat dissipating into the atmosphere”.
A Mitsubishi Electric City Multi WR2 heat pump system was installed to provide heating and cooling by using a closed loop slinky sitting at the bottom of the lake. The WR2 can harvest low grade heat from the lake and upgrade it to provide heating, or can take excess heat from cooling requirements and reject it safely into the lake.
Kooltech’s national technical manager, John Hammond, who was heavily involved in the project, said: “The temperature of the lake was around 17°C in summer and 5°C in winter, so we knew that absorption and rejection of heat was good”.
Using an open-water, slinky-based system was a sensible choice as borehole technology for a ground-source system would have been cost prohibitive. The WR2 system also uses inverter-driven control to modulate performance and energy consumption to suit the time of year and local conditions. When coupled with wall mounted air conditioning units to heat or cool the open plan areas and the café, the first phase of the project was complete.
Phase two involved the installation of a Mitsubishi Electric PWFY heat pump boiler as a primary heat source to meet the sanitary hot water, under floor and central heating requirements. The PWFY works seamlessly with the WR2 taking excess heat from the air conditioning to also provide a constant supply of hot water for the kitchen.
The whole system benefits from isolation valves, which is ideal for maintenance schedules because individual areas can be closed off without the need to shut everything down.
Discreet remote temperature sensors were commissioned in each room and an advanced TG-2000 control software system was installed on a central computer connected to a bespoke ‘K-Con’ control panel developed by Kooltech.
This gives the client ultimate control over energy consumption in each zone and means they can keep an eye on running costs, whilst also providing alerts for any faults that may occur.
Energy costs can rise up to 5% for every degree that the system deviates from the required temperature, so the client now has a sophisticated building management tool that can even be controlled remotely.
If that wasn’t efficient enough, SCS installed what Mitsubishi Electric claims is “the best third party turbine on the market” which provides 24-hour electric to run the WR2.
Alan Clague said: “Although the site is connected to the grid, the turbine generates 10KW of electricity, so this means that, other than the original capital, there are no other costs involved in the whole project.”
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