Ground Source Heat Pump for Wiltshire Nature Reserve using Lake Collector
Lake used for NIBE GSHP collector with Manifold in foreground.
Langford Lakes, a nature reserve owned by Wiltshire Wildlife Trust, sought advice from Ecoliving South West in order to find a system which would provide heating & hot water to their existing Lakeside Visitor Centre, working alongside the pre-installed Solar PV system.
The solution proposed was a 3 Phase 15kW NIBE F1145 Ground Source Heat Pump, using a lake collector. This method is very efficient due to the increased thermal conductivity & constant all year round temperatures of approximately 10 degrees at base of the lake, resulting in an installation that is efficient in terms of energy & cost. Furthermore, by utilising this natural heat source it worked well within a site dedicated to environmental & wildlife conservation.
As this is a commercial project the Ground Source Heat Pump is eligible for the Non- Domestic Renewable Heat Incentive (RHI) which provides quarterly, index- linked payments for 20 years to pay back the initial capital cost & thereafter supplement the running costs.
Cost of Installation: £28,629.62 + vat. Includes 15kW GSHP and radiator system installation.
Running Costs & Pay Back Period Estimate:
Net Energy required including hot water demand - 35,226kWh/year
Energy Delivered by GSHP - 35,226kWh/year
Energy Supplied to GSHP - 11,120kWh /year
Supplementary energy - 0kWh/year
Annual Fuel cost 11,120kWh x 13.5p per kW = £1,501.00 per annum
Equivalent cost currently using Oil boilers - £2,776.00 per annum
(7.88p per kWh x 35,226kWh)
Total energy saving using GSHP £1,275.00per annum
RHI incentive payment commercial
35,226kW x 0.087 = £3,065.00 per annum (index Linked)
Total RHI payment over 20 years - £61,300.00
Total Financial Gain Per Annum - £4,340.00per annum
Payback period - 6.89 years