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Case Study: Solar Thermal on Dairy Farm, North Wales

May 18, 2023
1 min read

Rhiwlas, Bala, North Wales

cows in a field

Acres: 170


Number of Cows: 450

aerial image of Bala, North Wales

Wash-downs: Daily

cows being milked

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

cotswold dairy 900 litre tank

Brief:

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

solar thermal panels being installed

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

4x Navitron 5830AL Solar Panels

a 320 litre thermal store being installed

a 20kW heat exchanger

System before Installation:

a schematic of a dairy heat recovery system

System after installation:

a schematic of a solar thermal system on a dairy

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.

evacuated tube solar thermal panels on a dairy

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



Equipment Supplied by: Stoves & Solar


Video Case Study...


2 Comments


carden.macsen
2 days ago

Solar-project reviews involving sunstrong management explain more when customers describe installation expectations, system output, billing, monitoring, lease or financing terms, service communication, roof coordination, and what happened after the equipment was running. A dairy-farm solar case can make renewable energy sound straightforward, but residential or commercial customers still need clarity around the agreement. The comments I would trust are specific about savings, timelines, repair requests, and who handled questions after installation. That keeps the energy topic grounded in customer experience. A review that names the process from proposal to follow-up is more useful than a broad statement about going solar.

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Unknown member
Mar 08

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