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| Table 1: Office heating and cooling energy data | |
| Heating | |
| Heating load (peak) | 1,500 kW |
| Annual heat demand | 1275 MWh/y |
| Design temperatures heating system | 60-40ºC |
| Cooling | |
| Cooling load (peak) | 1,700 kW |
| Annual cold demand | 825 MWh/y |
| Design temperatures cooling | 10-18ºC |
| Table 2: Energy consumption comparison (per year) | |||
| Conventional system | ATES/HP system | ||
| Heating | Heating | ||
| Gas boilers | 170,000 m³ | Gas boiler | 51,000 m³ |
| Electricity (well pumps) | 20 MWhe | ||
| Cooling | Cooling | ||
| Electricity chillers | 275 MWhe | Electricity (heat pumps) | 30 MWhe |
| Electricity (well pumps) | 20 MWhe | ||
| Chillers | 570 kWe | Heat pumps | 175 kWe |
| Table 3: Investment and maintenance costs | |||
| Conventional system | ATES/HP system | ||
| 2 boilers, 750 kW each | £95,000 | 1 boiler, 800 kW | £50,000 |
| Gas grid connection boilers | £25,000 | Gas grid connection boiler | £15,000 |
| 2 chillers with cooling towers, incl controls and installation. | £300,000 | 2 HP's, heat exchangers, overall control, piping and installation in MR | £270,000 |
| Electrical grid connection chillers | £20,000 | Electrical grid connection (heat pumps) | £5,000 |
| 2x2 wells 130 m. deep, well housings, well pummps and equipment and fiels piping and cables | £370,000 | ||
| dry-cooler, incl piping | £20,000 | ||
| Total investment (excl tax) | £440,000 | £730,000 | |
| All-in maintenance per year: | All-in maintenance per year: | ||
| boilers 3% | £2,900 | boiler and dry-cooler 3% | £2,100 |
| Chillers and cooling | Heat pumpd 6% | £8,400 | |
| towers 6% | £18,000 | Wells, heat exchangers etc 3% | £15,000 |
| Total maintenance cost | £20,900 | £25,500 | |
| Table 4: Energy consumption comparison (per year) | |||
| Conventional system | GSHP system | ||
| Heating | Heating | ||
| Gas boilers | 170,000 m³ | Gas boiler | 51,000 m³ |
| Electricity (heat pumps) 220 MWhe | |||
| Cooling | Cooling | ||
| Electricity chillers | 275 MWhe | Electricity (heat pumps) 115 MWhe | |
| Electricity (chillers) 80 MWhe | |||
| Electrical loads | |||
| Chillers | 570 kWe | Heat pumps | 470 kWe |
| Table 5: Investment and maintenance costs | |||
| Conventional system | GSHP system | ||
| 2 boilers, 750 kW each | £95,000 | 1 boiler, 800 kW | £50,000 |
| Gas grid connection boilers | £25,000 | Gas grid connection boiler 2 heat pumps, heat exchange, overall control, piping and in installation in MR | £15,000 |
| 2 chillers with cooling towers including controls and installation | £30,000 | 2 chillers with cooling towers, inc controls and installation | £180.00 |
| Electrical grid connection chillers | £20,000 | Electrical grid connection heat pumps and chillers | £15,000 |
| Chillers | Borehole field, incl field piping | £330,000 | |
| Total investment (excl taxes) | £440,000 | £790,000 | |
| All-in maintenance per year: | All-in maintenance per year: | ||
| Boilers 3% | £2,900 | Boiler, heat exchanger, etc 3% | £3,300 |
| Chillers and cooling towers 6% | £18,000%3Cbr /%3E | Heat pumps and chillers 6% | £19,200 |
| Borehole field 1% | £3,300 | ||
| Total maintenance cost | £20,900 | £25,800 | |