Tuesday, June 27, 2017

How do we heat our pool in Cambridge?

Because we like to keep our pool nice and warm (normally around 32ºC, most public pools are kept at about 26ºC) We needed to think of the environmental impact this would have.

Solar and Geothermal or ground source heat pumps are one of the most environmentally friendly ways of heating a swimming pool so it was decided that this was the way that we were going to heat our pool.

A geothermal heat pump circulates a mixture of water and antifreeze around a loop of pipe - called a ground loop - which is buried about a metre underground it zig zags around our garden and the car park. our ground loop is about 1000 metres of pipework in all!

The pipe is buried that deep because the temperature that far down stays quite constant all year around, even in winter!

Heat from the ground is absorbed into this fluid and is pumped through a heat exchanger in the heat pump. Heat passes through the heat pump compressor and is concentrated into a higher temperature heat which heats the water in the pool (and the hot water in the house!). Ground loop fluid, now cooler, passes back into the ground where it absorbs further energy from the ground in a continuous process.

Our heatpump has electricity supplied to it by our large solar installation. We believe this makes our swimming pool one of the most environmentally friendly pools in our area.