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  • Tomato cultivation in a modern glass greenhouse inThe Netherlands

  • LED illumination with 180 umol/m2/s intensity.

  • As light-conditions are equal in all scenarios, the temperatures to be achieved in the greenhouse are equal in all scenarios (a consequence of RTR-based temperature control)

  • Twoenergy screensto limit the heat demand

  • Dehumidification for Scenarios 2.1, 2.3 and 2.4 is performed by forced ventilation of outside air

  • CO2-enrichment from flue gases, supplemented with pure CO2

  • No variable costs for biomass

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Uitvouwen
titleHeat

In the base situation all heat is produced by the boiler. In the other Scenarios it is solely used as a backup system, in case the main system cannot meet the heat demand. The biomass boiler (2.4) is capable of covering almost all of the greenhouse heat demand. The heat pump and geothermal heat are capable of covering most of the heat demand (2.2-2.3).

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Uitvouwen
titleResource use

In the table below the consumption of different resources is compared.

  • Fossil fuel use can be reduced by switching heating technology.
    The alternative heating technologies (2.2-2.4) have significantly reduced the use of fossil fuels by switching to different methods of heat production. Maintaining a boiler as a backup system allowed for greenhouse with an accurate and consistent climate control, as well as realistic capacities for the heat pump, geothermal heat and biomass boiler.

  • Electricity use can be reduced by utilizing renewable sources.
    The use of available geothermal energy naturally reduces the electricity used for heating via a heat pump. Alternatively, the energy requirement can be covered using biomass.

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Performance

The overall performance, expressed in some key numbers and sustainability, is compared in the table below.

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