Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498182
Title Optimal control of greenhouse climate using minimal energy and grower defined bounds
Author(s) Beveren, P.J.M. van; Bontsema, J.; Straten, G. van; Henten, E.J. van
Source Applied energy 159 (2015). - ISSN 0306-2619 - p. 509 - 519.
DOI https://doi.org/10.1016/j.apenergy.2015.09.012
Department(s) WUR GTB Algemeen
WUR GTB Tuinbouw Technologie
Farm Technology Group
Wageningen UR Greenhouse Horticulture
Biobased Chemistry and Technology
Biomass Refinery and Process Dynamics
PE&RC
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Cooling - Energy - Greenhouse climate - Heating - Optimal control
Abstract

Saving energy in greenhouses is an important issue for growers. Here, we present a method to minimize the total energy that is required to heat and cool a greenhouse. Using this method, the grower can define bounds for temperature, humidity, CO2 concentration, and the maximum amount of CO2 available. Given these settings, optimal control techniques can be used to minimize energy input. To do this, an existing greenhouse climate model for temperature and humidity was expanded to include a CO2 balance. Heating, cooling, the amount of natural ventilation, and the injection of industrial CO2 were used as control variables.Standard optimization settings were defined in order to compare the grower's strategy with the optimal solution. This optimization resulted in a theoretical 47% reduction in heating, 15% reduction in cooling, and 10% reduction in CO2 injection for the year 2012. The optimal control does not need to maintain a minimum pipe temperature, in contrast to current practice. When the minimum pipe temperature strategy of the grower was implemented, heating and CO2 were reduced by 28% and 10% respectively.We also analyzed the effect of different bounds on optimal energy input. We found that as more freedom is given to the climate variables, the higher the potential energy savings. However, in practice the grower is in charge of defining the bounds. Thus, the potential energy savings critically depend on the choice of these bounds. This effect was analyzed by varying the bounds. However, because the effect can be demonstrated to the grower, the outcome has value to the grower with respect to decision making, an option that is not currently available in practice today.

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