Simulation of humidity control and greenhouse temperature tracking in a growth chamber using a passive air conditioning unit |
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| Affiliation: | 1. Department of Horticulture, University of Georgia, 1111 Miller Plant Sciences Building, Athens, GA, 30602, USA;2. School of Electrical and Computer Engineering, University of Georgia, 708 Boyd Graduate Studies Research Centre, 200 D.W. Brooks Dr., Athens, GA, 30602, USA;1. Escuela de Ingeniería Industrial, Universidad de Castilla La Mancha, Avd. de Carlos III, 45071, Toledo, Spain;2. Facultad de Ciencias del Deporte, Universidad de Castilla La Mancha, Avd. de Carlos III, 45071, Toledo, Spain;3. Escuela Superior de Informática, Universidad de Castilla La Mancha, Paseo de la Universidad s/n, 13071, Ciudad Real, Spain;1. Department of Plant Science, Horticultural Science and Biotechnology Program, College of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea;2. Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, 08826, Republic of Korea;3. Plant Genomics and Breeding Institute, Seoul National University, Seoul, 08826, Republic of Korea;1. Institute of Crop Science, University of Hohenheim, Stuttgart, Germany;2. Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), OT Gatersleben, 06466 Stadt Seeland, Germany;1. School of Sustainable Development of Society and Technology, Mälardalen University, P.O. Box 883, SE-721 23 Västerås, Sweden;2. Institute of Electronic and Automatic, (LCOMS Lab, ASEC), Lorraine University, France;3. Department of Agricultural, Forest and Food Sciences, University of Torino, Grugliasco, Italy;4. National Engineering School of Tunis, Lab of Research in Analysis Design and Control Systems, Tunis El Manar University, Tunis, Tunisia |
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| Abstract: | In this paper, we define a dynamic discrete model of a passive air conditioning unit, without the more typical compression or absorption-refrigeration cycle. The unit is composed of heat exchangers, a positioning system and humid corrugated pads. The aim of the study was to follow the temperature in a greenhouse and to replicate it with a desired and stable relative humidity in a ventilated growth chamber. A control law, based on a quadratic criterion and dynamic programming, taking output error and energy consumption minimisation into account, was used to control the behaviour of the unit in spite of air intake disturbances. The results of the simulation indicate that the air conditioning unit can produce a variable climate in the growth chamber, with a wide range of relative humidity setpoints. |
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