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The latest version of EMMA – a new EMMA 3G Cascade unit – has been installed with 3 Evance wind turbines in Inverness on the banks of Loch Ness.
Customer feedback shortly after installation:
“I am pleased to say that in the days since EMMA was installed it has been very windy and we have had some very hot baths without the need to burn oil.”
The three EMMA 3G units are sending power to immersion heaters and storage radiators in three separate houses with three separate turbines.
The first install has EMMA sending power to two cylinders, using its Cascade capability:
The schematic below describes the installation and gives an indication of what can be achieved with EMMA Cascade:
This is the first Evance turbine using EMMA 3G to harness wind power for heating.
Cylinders and Storage Heaters
The other 2 EMMA units in Loch Ness have been used to heat water in a cylinder and switch over to heat a storage radiator once the cylinder has reached its temperature.
The Site makes use of Economy 7 electricity so, while still straightforward, this installation needed to have a little attention given to the positioning of the CTs and also to the switchover mechanism between the hotwater tank and the storage radiator.
This is easily achievable, as demonstrated in the schematic below, using standard components from electrical wholesale:
The extra components are a 230v Dual Pole Dual Throw relay meaning the power source can be either direct mains or EMMA to the cylinder or the Storage radiator.
The DPDT relay is power by a clamp on stat that is closed when the temperature of the cylinder is below the desired hot water temperature.
This keeps the relay engaged sending EMMA power to the cylinder and Economy 7 power to the Storage Rad.
Once the stat disengages the Relay switches over to its alternate poles, disengaging power to the cylinder entirely and switching from Economy 7 to EMMA power on the Storage Rad.
Clever simple applications
There are many more clever simple applications that can be achieved with EMMA using standard electrical equipment to help maximise the free power output from EMMA to heating devices.
On a side note the EMMA’s timer can be used to turn on the heat at any point (e.g. follow Economy 7 times) or by simply using the boost button if renewable heat is not sufficient.
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