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Recent developments in the modelling of imperfectly mixed airspaces.

Young, Peter C. and Price, Laura and Berckmans, Daniel and Janssens, Karl (2000) Recent developments in the modelling of imperfectly mixed airspaces. Computers and Electronics in Agriculture, 26 (3). pp. 239-254. ISSN 0168-1699

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Abstract

This paper discusses the Data-Based Mechanistic (DBM) approach to modelling the micro-climate in agricultural buildings. Here, the imperfect mixing processes that dominate the system behaviour during forced ventilation are first modelled objectively, in purely data-based terms, by continuous-time transfer function relationships. In their equivalent differential equation form, however, these models can be interpreted in terms of the Active Mixing Volume (AMV) concept, developed previously at Lancaster in connection with pollution transport in rivers and soils and, latterly, in modelling the micro-climate of horticultural glasshouses. This can be compared with the incomplete mixing and control volume concepts that have been investigated previously at Leuven. The data used in the initial stages of the research project, as described in the paper, have been obtained from a series of planned ventilation experiments carried out in a large instrumented chamber at Leuven. The overall objectives of this collaborative study are twofold: first, to gain a better understanding of the heat transfer and micro-climate dynamics in the chamber; and second, to develop models that can form the basis for the design of optimal Proportional-Integral-Plus (PIP-LQ) climate control systems for livestock buildings of a kind used previously for controlling the micro-climate in horticultural glasshouses. Although not specifically directed at glasshouse systems, the techniques described in the paper can be applied straightforwardly within a glasshouse context.

Item Type: Article
Journal or Publication Title: Computers and Electronics in Agriculture
Uncontrolled Keywords: Data-based modelling ; Imperfect mixing ; Forced ventilation ; Micro-climate ; Heat and mass transfer ; Active mixing volume ; Control volume ; Optimal control
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21674
Deposited By: ep_ss_importer
Deposited On: 04 Feb 2009 11:41
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:50
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21674

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