Objective
A SWS 18.5 KW wind turbine is used for electricity generation in conjunction with a heat pump using a novel type of evaporator in order to heat a 600 m2 greenhouse. The estimated annual yield by the wind turbine is 35 MWh. The heat pump will contribute 52.5 MWh/y.
The machine has been operational since July 1985. Since then it produced more than 35 MWh due to the fact that the average wind speed at the site is about 4,5 m/s (at 10 m height). During 1986 (whole year) the machine showed an availability of 94%, generated 24,7 MWh and the capacity factor was 15%. The electricity generated is used by the heat pump. The latter supplies water at 50 deg. C, which is used in a heat exchanger to heat nutrient solution to 95 deg. C and the heat is distributed uniformily throughout the double-clad polythene greenhouse. Initial results show that percentages of wind turbine output absorbed by the heat pump vary between 43.5 and 67.3% while the heat pump demand ranged from 12.1% to 64.5%. The heat utilised 49.2% of the energy delivered by the wind turbine. Of the total energy consumption of the heat pump 35% was provided by wind. Furthermore, it has illustrated the beneficial effect of wind speed in improving heat transfer from the ambient air to the heatpump evaporator. Finally, the economic attractiveness of the wind turbine/heat pump system is strongly related to the degree of matching which is achieved between the energy production of the wind turbine and the heat pump. Scandinavian Wind Systems, suppliers of the wind turbine ceased to trade, soon after the installation. The project leader who was verry enthousiastic left the organization, The machine is not longer operational.
A 18,5 KW, 11 m diameter wind turbine made by the Scandinavian Wind Energy Systems Ltd, de Odder, is used by An Foras Taluntais at Dublin, for electricity generation in conjunction with a heat pump for heating purposes of a 600 m2 greenhouse, with a peak demand of 150 KW.
The SWS-185p is a three-bladed, fixed pitch, downwind type wind turbine with a 18,5 KW asynchronous generator, cut-in speed at 3,9 m/s, rated speed 13 m/s and cut-out 22 m/s. The 3,5 KW compressor heat pump, made by ERINOVA (IR) is air-to-water type and uses a novel type of evaporator in the form of an air-to-brine heat exchanger (WRE Collector). The output is in form of warm water of 45 C. The energy delivered by the heat pump is estimated at 52,5 MWh/y and by the wind turbine estimated at 35 MWh/y. During windless periods, heat will be provided from the existing steam boiler. The project shows a payback time of 15 years.
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Coordinator
4 Dublin
Ireland
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