Energie-extensieve teelten klimaatneutraal met hoog-isolerende kassen

In this study an analysis is presented on the perspectives of highly insulated greenhouses for extensively heatedgreenhouse crops. Three crops were used as an example, ranging from Antirrhinum, with a yearly heatingdemand of 4 m³ of natural gas equivalents per m² to strawberry, with 13 m³ of gas consumption per m² peryear.If Antirrhinum would be grown in a double glazed, highly insulated greenhouse with an energy recuperatingdehumidification system, the remaining heat demand will be almost zero. Growing strawberries in such agreenhouse reduces the gas consumption for heating down to 7 m³/(m² year). When generating this heatwith a heat pump, only 21 kWh/(m² year) will be needed for heating. In all greenhouse sectors, a tendencytowards an intensified production by using artificial illumination can be seen. Illumination has a much higherimpact on energy consumption than heating, so insulation of greenhouses for extensively heated crops is of lessimportance than improving the transmissivity or developing better lighting systems.Besides energy for heating and lighting, greenhouses use a substantial amount of energy for soil disinfection.Here savings can be achieved by using biological disinfection, substrate systems or ozonized water.This project was funded by the research program ‘Kas als Energiebron’, the joined action and innovation programof the ministry of Economic affairs and LTO Glaskracht Nederland