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| Table 1: Breakdown of the cost of a typical open loop borehole system | |
| Description | Cost (£) |
| General items | Ìý |
| Mobilisation, insurances, demobilisation on completion | 20,000 |
| Fencing around working area for the duration of drilling and testing | 2000 |
| Modifications to existing LV panel and installation of new power supplies for borehole installation | 14,000 |
| Trial hole | Ìý |
| Allowance for breakout access to nearest walkway (Existing borehole on site used for trial purposes, hence no drilling costs included) | 3000 |
| Construct borehole | Ìý |
| Drilling, using temporary casing where required, permanent casing and grouting | 31,000 |
| Borehole cap and chamber | Ìý |
| Cap borehole with PN16 flange, construct manhole chamber in roadway, rising main, header pipework, valves, flow meter | 12,000 |
| Permanent pump | 13,000 |
| Samples | 300 |
| Acidisation | Ìý |
| Mobilisation, set up and removal of equipment for acidisation of borehole, carry out acidisation of borehole including removal of all waste, including supply of acid | 11,500 |
| Development and test pumping | Ìý |
| Mobilise pumping equipment and materials and remove on completion of testing | 4000 |
| Calibration test, pre-test monitoring, step testing | 3500 |
| Constant rate testing and monitoring | 19,000 |
| Waste removal and disposal | 6500 |
| Geophysical logging of abstraction borehole at end of testing | 3000 |
| Reinstatement | Ìý |
| Reinstatement and making good | 1500 |
| Total | 144,300 |
| Table 2: Cost comparison of conventional and closed loop thermal pile cooling installation | ||||
| Description | Closed loop thermal pile cooling system | Conventional heating and cooling system | ||
| Ìý | £ | Unit rate (£/m² gifa) | £ | Unit rate (£/m² gifa) |
| HEAT SOURCE | Ìý | Ìý | Ìý | Ìý |
| LTHW boiler and flue | Ìý | Ìý | Ìý | Ìý |
| LTHW boiler – 30 kW output | 6000 | 2.4 | – | – |
| LTHW boiler – 80 kW output | – | – | 15,000 | 6 |
| Flue system | incl | incl | incl | incl |
| Gas supply | incl | incl | incl | incl |
| SPACE HEATING AND AIR TREATMENT | ||||
| LTHW installation | Ìý | Ìý | Ìý | Ìý |
| LTHW pipework distribution in plantroom, pumps, pressurisation unit, water treatment, insulation | Ìý | 7500 | 3 | 10,000 |
| CHW installation | Ìý | Ìý | Ìý | Ìý |
| Water cooled chiller unit (40 kW load), dry air cooler (90 kW load), pipework distribution in plantroom (excl condenser water), pumps, pressurisation unit, water treatment, insulation | 22,000 | 8.8 | – | – |
| Water cooled chiller unit (90 kW load), dry air cooler (180 kW load), pipework distribution in plantroom (excl condenser water), pumps, pressurisation unit, water treatment, insulation | – | – | 34,000 | 13.6 |
| Condenser water pipework, valves, pumps | 16,000 | 6.4 | 20,500 | 8.2 |
| Energy piles | Ìý | Ìý | Ìý | Ìý |
| Pipework to 50 piles – total output 50 kW | 41,000 | 16.4 | – | – |
| Header and pipe connections | 6000 | 2.4 | – | – |
| Connection to heat pump from header | 8000 | 3.2 | – | – |
| Heat pump package unit | Ìý | Ìý | Ìý | Ìý |
| Water to water heat pump unit incl all associated controls, 63 kW cooling load, 53 kW heating load | 34,000 | 13.6 | – | – |
| Total | 140,500 | 56 | 79,500 | 32 |
| The following exclusions relate to the above costs: Secondary heating and cooling circuits within the building, inflation beyond third quarter 2004, main contractor’s overheads, profit and attendance, main contract preliminaries, professional and prescribed fees, contingency and design reserve, VAT. | ||||
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