Case Study: Solar Thermal on Dairy Farm, North Wales
Rhiwlas, Bala, North Wales

Acres: 170
Number of Cows: 450

Wash-downs: Daily

Existing water heating system:
900 litre Cotswold Dairy Heater using 2x 6kW Immersion Heaters
Temperature Required: 85 DegC
Daily Electrical usage: 200 kWh
Annual running cost: £12,0000 at 17p per kWh

Brief:
To install Solar Thermal to supply hot water and offset electrical heating cost.

Equipment to be installed:
4x Navitron 5830AL Evacuated Tube Panels
320 litre buffer tank / heat dump
20kW Heat Exchanger
Controller and Pumping Station
Heat Meter



System before Installation:

System after installation:

How it works:
The solar thermal primarily heats the 900 litre Cotswold Tank via heat exchanger to 85 degC. Once satisfied the heat is diverted via 3-port valve to the 320 litre thermal store. Water from the heat recovery unit is passed through this thermal store to collect any additional heat within before being sent to re-fill the 900 litre accumulator thus acting as a pre-heat.

Peak Output: 7404 W
Total Aperture Area: 11.32 m2
Zero loss collector efficiency 0.654 n0
Total Annual Irradiance for 1 m2 on 15 degree pitch: 1106.47 kWh
Expected Annual Savings: £1392.55
Expected Year of Return (on current utility tariff): 8
Installed by: Remote Power UK & Horisun Renewable Energy
Equipment Supplied by: Stoves & Solar
Video Case Study...





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