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1. Heating with a boiler as reference case

2. Heat pump with heat recovery and seasonal heat storage

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3. Geothermal heat

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4. Additional biomass boiler

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With the following assumptions:

• Tomato cultivation without artificial illumination 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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