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The project involved the use of a grid-connected wind turbine in conjunction with a heat pump to supply heat to a greenhouse. The horizontal-axis wind turbine, with a three-blade fixed-pitch 11-metre diameter rotor, was rated to deliver 18.5 kW at a windspeed of 13 m/s. The air to water heat pump had a compressor power demand of 3.75 kW and was rated to deliver 11 kW in water at 50 C. Mismatch between wind turbine output and heat pump demand was catered for by interchange of energy with the utility grid. The output of the heat pump was used to heat the nutrient solution for the production of a tomato crop using a hydroponic growing system in a 600 m2 energy-saving double-clad polythene greenhouse. The project has been successfully completed. Between 1 January 1986 and 30 June 1988, the availability of the wind turbine has been 90% and the outages which occurred were due to relatively minor causes. Energy production of 25 MWh in 1986 was satisfactory. Based on the 1986 performance the pay-back time for the project would be 14.5 years, compared with an estimate in the original project proposal of 14.9 years.

Additional information

Authors: O'FLAHERTY T, Teagasc, Kinsealy Research Centre, Malahide Road, Dublin 17 (Eire)
Bibliographic Reference: EUR 12171 EN (1989) FS, 56 pp., ECU 6.25
Availability: (2)
ISBN: ISBN 92-825-9976-0;CD-NA-
Record Number: 198910976 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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