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Measurement and simulation of the ventilation rates in a naturally ventilated Azrom type greenhouse in Zimbabwe

Emmanuel Mashonjowa UGent, Frederik Ronsse UGent, James Milford, Raoul Lemeur UGent and Jan Pieters UGent (2010) APPLIED ENGINEERING IN AGRICULTURE. 26(3). p.475-488
abstract
A simple greenhouse ventilation model, based on the stack and wind effects (the main driving forces for natural ventilation) was adapted, calibrated and validated using measured air renewal rates in a three span naturally ventilated Azrom type greenhouse in Zimbabwe. Crop transpiration rates were monitored using stem heat balance sap flow gauges installed on the main stems of rose plants to continuously monitor whole-plant transpiration (WPT). This allowed continuous and automatic determination of full scale air renewal and leakage rates using the water vapour balance method. The model was fitted to experimental data of ventilation rates, and discharge and wind effect coefficients were determined. The results show a good fit between measured and predicted values (R2 = 0.80 and 0.82 for winter and summer, respectively), although there is a general over-estimation of the greenhouse air renewal rates, particularly during the night. The model, nevertheless, adequately describes the natural ventilation process in the greenhouse all year round. The model can be used as a design tool to evaluate and optimise the effects of different ventilation configurations and strategies on greenhouse air renewal rates, and as a component in a greenhouse climate model in order to further evaluate the effects of ventilation strategies on the inside greenhouse and crop microclimate, and thus lead to better greenhouse climate control.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
HEAT-BALANCE METHOD, CONTINUOUS ROOF VENTS, FLOW MEASUREMENTS, SIDE OPENINGS, SAP FLOW, TRANSPIRATION, MICROCLIMATE, ROSE, WIND, SCREENS, Climate control, Climate model, Greenhouses, Ventilation, Ventilation rate, Ventilation model
journal title
APPLIED ENGINEERING IN AGRICULTURE
Appl. Eng. Agric.
volume
26
issue
3
pages
475 - 488
Web of Science type
Article
Web of Science id
000279415900015
JCR category
AGRICULTURAL ENGINEERING
JCR impact factor
0.507 (2010)
JCR rank
9/12 (2010)
JCR quartile
4 (2010)
ISSN
0883-8542
language
English
UGent publication?
yes
classification
A1
additional info
ASABE Honorable Mention Paper Award (08/08/2011)
copyright statement
I have transferred the copyright for this publication to the publisher
id
831181
handle
http://hdl.handle.net/1854/LU-831181
date created
2010-01-20 13:41:33
date last changed
2011-08-31 11:15:38
@article{831181,
  abstract     = {A simple greenhouse ventilation model, based on the stack and wind effects (the main driving forces for natural ventilation) was adapted, calibrated and validated using measured air renewal rates in a three span naturally ventilated Azrom type greenhouse in Zimbabwe. Crop transpiration rates were monitored using stem heat balance sap flow gauges installed on the main stems of rose plants to continuously monitor whole-plant transpiration (WPT). This allowed continuous and automatic determination of full scale air renewal and leakage rates using the water vapour balance method. The model was fitted to experimental data of ventilation rates, and discharge and wind effect coefficients were determined. The results show a good fit between measured and predicted values (R2 = 0.80 and 0.82 for winter and summer, respectively), although there is a general over-estimation of the greenhouse air renewal rates, particularly during the night. The model, nevertheless, adequately describes the natural ventilation process in the greenhouse all year round. The model can be used as a design tool to evaluate and optimise the effects of different ventilation configurations and strategies on greenhouse air renewal rates, and as a component in a greenhouse climate model in order to further evaluate the effects of ventilation strategies on the inside greenhouse and crop microclimate, and thus lead to better greenhouse climate control.},
  author       = {Mashonjowa, Emmanuel and Ronsse, Frederik and Milford, James and Lemeur, Raoul and Pieters, Jan},
  issn         = {0883-8542},
  journal      = {APPLIED ENGINEERING IN AGRICULTURE},
  keyword      = {HEAT-BALANCE METHOD,CONTINUOUS ROOF VENTS,FLOW MEASUREMENTS,SIDE OPENINGS,SAP FLOW,TRANSPIRATION,MICROCLIMATE,ROSE,WIND,SCREENS,Climate control,Climate model,Greenhouses,Ventilation,Ventilation rate,Ventilation model},
  language     = {eng},
  number       = {3},
  pages        = {475--488},
  title        = {Measurement and simulation of the ventilation rates in a naturally ventilated Azrom type greenhouse in Zimbabwe},
  volume       = {26},
  year         = {2010},
}

Chicago
Mashonjowa, Emmanuel, Frederik Ronsse, James Milford, Raoul Lemeur, and Jan Pieters. 2010. “Measurement and Simulation of the Ventilation Rates in a Naturally Ventilated Azrom Type Greenhouse in Zimbabwe.” Applied Engineering in Agriculture 26 (3): 475–488.
APA
Mashonjowa, E., Ronsse, F., Milford, J., Lemeur, R., & Pieters, J. (2010). Measurement and simulation of the ventilation rates in a naturally ventilated Azrom type greenhouse in Zimbabwe. APPLIED ENGINEERING IN AGRICULTURE, 26(3), 475–488.
Vancouver
1.
Mashonjowa E, Ronsse F, Milford J, Lemeur R, Pieters J. Measurement and simulation of the ventilation rates in a naturally ventilated Azrom type greenhouse in Zimbabwe. APPLIED ENGINEERING IN AGRICULTURE. 2010;26(3):475–88.
MLA
Mashonjowa, Emmanuel, Frederik Ronsse, James Milford, et al. “Measurement and Simulation of the Ventilation Rates in a Naturally Ventilated Azrom Type Greenhouse in Zimbabwe.” APPLIED ENGINEERING IN AGRICULTURE 26.3 (2010): 475–488. Print.