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Abstract

The aim of the project was to use geothermal energy to provide heating for buildings and public facilities in the city centre of Southampton. After drilling the production well, a district heating scheme was constructed in 1986. The operation has been running successfully for the past two years and the project is the first one in the UK to make use of geothermal resources for district heating applications. The single well was drilled in the Wessex basin into triassic sandstones at a depth of 1 796m. Interference studies carried out during long-term pumping indicate that the reinjection of cooled brine would quickly influence the water temperature in the production well; the adopted solution was to discharge the cooled brine into the River Test estuary through the existing water sewer. Production flowrate of 40 m3/h at 72 C and 125 g/l salinity is extracted by means of a turbopump. The brine is delivered to the heating station where a 2 MW heat exchanger is installed close to a 250 kVA diesel engine with heat recovery and 2 MW fuel boilers for back-up and peak load. The geothermal plant can supply about 60% of the annual energy demand and save about 625 toe/year with a corresponding payback of about seven years.

Additional information

Authors: SOUTHAMPTON GEOTHERMAL HEATING COMPANY, Southampton Geothermal Heating Company, Pelham House, Broadfield, Crawley, West Sussex (GB)
Bibliographic Reference: EUR 12345 EN (1989) 26 pp., FS, ECU 5
Availability: (2)
Record Number: 199010046 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en