Owen Square Community Energy Project
Transcript of Owen Square Community Energy Project
The problem with running heat pumps from renewables
The ‘holy grail’ for integrating heat pumps into the grid
If we ‘spend’ 1 kWh on summer electricity can we reduce winter heat
pump electricity use by 1 kWh?
CHOICES ‘timeshifts’ heat pump electricity use from winter to summer
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Interseasonal heat storage energy centre
Solar microgrid
Owen Square Community Energy
CHOICES developed a TRNSYS model to answer this question
We are modelling very promising active recharge COP
Scenarios 1 – 3Illustrates increase in CoP when the same charge is spread over a longer time period (charging most efficient at low speeds)
But the max economic level of seasonal shift is limited by borehole design
Owen Square park, Bristol (£168,000):● 12 x 150m boreholes (1.8km)● 7m distance between boreholes● 1 u-pipe per string, 12 strings● 50,000m3 volume● Low temperature array● Grid benefits: ~4500 kWh/year
Braedstrup, Denmark (£188,000):● 48 x 50m boreholes (2.4km)● 3m distance between boreholes● 12 u-pipes per string, 16 strings● 19,000m3 volume● High temperature array ● Grid benefits: Potentially much higher
Similar size/cost but very different
designs
Further research will explore other borehole designs seeking further grid benefits