This section provides details of an example project featuring a cascaded ground source heat pump system fed by a pond mat ground array.
We have provided a ground source heat pump design with schematic drawings, ground source heat pump installation costs and a real-life case study and ground source heat pump reviews to showcase how a cascaded ground source heat pump system architecture fed by pond mats can effectively meet a high commercial heating and hot water load.
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For illustrative purposes only
Example: Project & Finances
Based on the above schematic, Kensa has calculated example costs below to illustrate the upfront finance required and the expected running costs and income generated via the Non-Domestic Renewable Heat Incentive (RHI) over a 20 year period (the duration of the Non Domestic RHI), compared to an LPG system. For a bespoke quote please click here.
Heat Pump Specification
|System architecture||Cascaded central plant|
|Total heat pump capacity||120kW|
|Equipment type||3x 45kW Plantrooms|
|Potable DHW temp||Space heating only|
|Integral immersion heaters||No (DNO friendly)|
|Ground array type||Pond mats|
|Pond mats required||x24 plus header pipework|
|Lake area required - no flow||6000sq/m|
Total Project Costs, Savings & Returns vs LPG
| ||Kensa Ground Source Heat Pump & Ground Array||LPG Boiler|
|Lifetime Expectancy: Appliance||Up to 20 years||Up to 10 years|
|Lifetime Expectancy: Infrastructure||Up to 100 years||-|
|Carbon Saved (over 20 years)||800 tonnes||0 tonnes|
|Appliance & Infrastructure Cost*||£83K to £100K||£7K|
|Running Costs (over 20 years)**||£350K to £400K||£450K to £550K|
|Servicing Costs (over 20 years)***||£0K||£2K|
|RHI Income (over 20 years)****||£350K - £500K||Not eligible|
|Net cost (after 20 years)*****||£0K - £83K||£459K - £559K|
*Costs are for the supply and installation of the Kensa heat pump and ground array only, and the supply and installation of the LPG boiler equipment only. Costs for supply and installation of internals such as radiators, underfloor and heating controls are not included, please speak to your plumbing contractor. **Based on electric at 15p/kW/hr and COP of 3. Based on LPG at 40p a litre and 85% efficiency ***Ground source heat pumps have no requirement for annual maintenance. However, it is good practice for the heating distribution system to be proactively checked and maintained to ensure optimum performance. ****The NON-DOMESTIC RHI is a 20 year index linked funding stream which assumes inflation at 3%. *****Net cost for LPG does not include an additional LPG boiler, which will likely need to be factored in during the 20 year comparison period due to the LPG’s 10 year average lifetime expectancy.
Case study: The Old Farmhouse
The owners of the Old Farmhouse in Lancashire replaced their old, inefficient LPG boiler with a cascaded ground source heat pump system from Kensa to provide heating and hot water to three separate dwellings, thus benefiting from the Non Domestic Renewable Heat Incentive (RHI).
- Working agricultural farm and c1900 farmhouse;
- Converted barn and stable buildings;
- Cascaded ground source heat pump system;
- 1x 24kW Kensa Twin Compact for heating;
- 1x 21kW Kensa Hybrid for heating and hot water;
- 12x pond mats submerged in pond.