Case study: Lee Valley White Water Centre
Lee Valley White Water Centre attracts avid water sport enthusiasts as well as a large body of free renewable energy, which is now the heat source for the Centre’s buildings courtesy of a Kensa ground source heat pump!
Lee Valley White Water Centre, set in the picturesque 1,000 acre River Lee Country Park, part of the 26 mile long Lee Valley Regional Park, provides a much needed white water site for canoeists, kayakers and rafters alike.
Effort was sought by the developers of this project to reduce the carbon footprint of the Park’s operations and maximise energy efficiency. As a result, two Kensa 75kW Commercial Plantroom heat pumps were installed into this prestigious project by Enevis Ltd. With over 20 years experience and a team of qualified engineers, electricians, plumbers and installers, Enevis worked closely with Kensa Heat Pumps to ensure this unique project was a success from design stage, right the way through to on-site commissioning.
A number of energy sources can be used as the heat source for heating buildings such as Lee Valley White Water Centre. Most commonly, ground heat pumps draw heat from ground via boreholes or coiled pipework buried in trenches, known as Slinkies. Other heat sources include water, nearby streams, lakes and other natural water bodies. Any large water source situated close to the proposed building to be heated is an ideal energy source for a heat pump, and has a number of advantages when compared to ‘ground’ arrays:
- No digging of trenches is required, which significantly reduces installation costs from the outset;
- The heat transfer rate from water is higher than that in the ground;
- The water is in close contact with the entire pipe at all times;
- The flow of water in the lake provides constant energy replacement;
- The return temperature to the heat pump is generally higher, which in turn increases the coefficient of performance of the heat pumps.
As part of the Lee Valley Regional Park development plans, a lake was to be purpose built to provide the water into the kayak and white water courses.
When Kensa Heat Pumps were asked to provide a heating and cooling solution for the Lee Valley White Water Centre, utilising the purpose built lake as the energy source for the two 75kW Plantroom Heat Pumps was the most compelling solution from a cost saving and CO2 reduction point of view.
Kensa supplied 30 x 50m long slinky ground arrays, which were buried under pea gravel in the header of the lake which feeds the kayak course by Enevis. The slinkies were buried under the pea gravel to provide protection for the slinkies and to ensure they remained buried under water.