EFFECT OF ENVELOPE CHARACTERISTICS ON THE ACCURACY OF DISCRETISED GREENHOUSE MODEL IN TRNSYS

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dc.contributor.authorAkpenpuun, Timothy
dc.date.accessioned2023-05-02T12:06:06Z
dc.date.available2023-05-02T12:06:06Z
dc.date.issued2022-06-30
dc.description.abstractTRNSYS is a standard tool recently used to model and simulate greenhouse energy demand and utilisation using building energy simulation (BES). Previously, a single thermal point was used for validation, ignoring the distribution of greenhouse climate parameters, especially the temperature. Temperature variation often leads to thermal stratification, prompting researchers to propose volume discretisation in dynamic greenhouse simulations. In this context, the effect of envelope characterisation on the accuracy of the discretised TRNSYS BES model was developed to determine the best BES model under a free-floating regime. The combination of the number of layers [double (D) and single (S)], geometry mode [3D and manual (M)], and layer type [massless (M) and no glazing window (W)], led to the development of five models: D_3D_M, D_3D_W, D_M_M, S_3D_W, and S_M_M. The simulation was performed in a standard radiation mode, and the output parameters were temperature and relative humidity (RH). R2 and the root square mean error (RSME) were used to check the fitness and degree of deviation, respectively, to validate the models. Analysis of variance (ANOVA) was employed to investigate the significant differences among the models, whereas contour plots were used to compare the distribution pattern between the significant models and experimental data. Validation of the models showed that the obtained R2 values ranged from 0.86 to 0.95, and the RSME values for the temperature were between 2.64°C and 3.91°C. These values were 0.91-0.93 and 19.72%-30.32% for RH. The ANOVA (P<0.05) result exhibited significant differences between the S-scenario models and experimental central points in temperature and RH. However, the D- and S-layer scenarios with a 3D geometry and massless layer showed similar distributions with their corresponding experimental greenhouses. Hence, 3D_M was regarded as the best combination in the discretised BES model.en_US
dc.description.sponsorshipThe Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (iPET) through the Agriculture, Food and Rural Affairs Convergence Technologies Program for Educating Creative Global Leader, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA) (717001-7). Basic Science Research Program supported this research through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2019R1I1A3A01051739). This work was supported by the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (iPET) through the Agricultural Energy Self-Sufficient Industrial Model Development Program, funded by the Ministry of Agriculture, Food and Rural Affairs (MAFRA) (120096-3).en_US
dc.identifier.otherhttps://www.doi.org/10.4081/jae.2022.1420
dc.identifier.urihttps://www.agroengineering.org/index.php/jae/article/view/1420/1044
dc.identifier.urihttps://uilspace.unilorin.edu.ng/handle/20.500.12484/9462
dc.language.isoenen_US
dc.publisherJournal of Agricultural Engineeringen_US
dc.relation.ispartofseries53;3
dc.subjectBuilding; discretisation; energy; envelope characteristics; simulation; TRNSYS.en_US
dc.titleEFFECT OF ENVELOPE CHARACTERISTICS ON THE ACCURACY OF DISCRETISED GREENHOUSE MODEL IN TRNSYSen_US
dc.typeArticleen_US

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