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Eliminating the heat input as parameter in the Sapflow+ method

Maurits Vandegehuchte and Kathy Steppe UGent (2013) Acta Horticulturae. 991. p.93-100
abstract
The recently developed Sapflow+ method to determine sap flux density and sapwood water content necessitates a correct estimation of the heat generated by the heater needle. Even though this can theoretically be calculated based on the resistance of the heater and the applied voltage and current, in practice, however, these theoretical calculations overestimate the actual heat output due to probe limitations. Originally, the heater was therefore calibrated in a medium with known thermal characteristics, leading to an accurate correction factor. Elimination of this heat input from the model is, nevertheless, much more convenient as sensor specific calibration is labour-intensive and has to be conducted meticulously as the needle distances during calibration have to be equal to those applied during field measurements. Dividing the original equations is theoretically possible to eliminate the heat input, but has practical limitations. Adapting the equations and grouping heat input and volumetric heat capacity into a single parameter, however, enables in-situ estimations of heat input if a single measurement of dry wood density and water content is conducted. Our results show that, based on a single wood core measurement, the Sapflow+ sensor can be calibrated in-situ, pre-empting sensor specific calibration in a separate medium.
Please use this url to cite or link to this publication:
author
organization
year
type
conference (proceedingsPaper)
publication status
published
subject
in
Acta Horticulturae
Acta Hortic.
editor
Kathy Steppe UGent
volume
991
issue title
Proceedings of the ninth international workshop on sap flow
pages
93 - 100
publisher
International Society for Horticultural Science (ISHS)
place of publication
Leuven, Belgium
conference name
9th International workshop on Sap Flow
conference location
Ghent, Belgium
conference start
2013-06-04
conference end
2013-06-07
Web of Science type
Proceedings Paper
Web of Science id
000332514600011
ISSN
0567-7572
ISBN
9789066055063
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
3464971
handle
http://hdl.handle.net/1854/LU-3464971
alternative location
http://www.actahort.org/books/991/991_11.htm
date created
2013-06-19 15:35:16
date last changed
2017-05-02 11:33:45
@inproceedings{3464971,
  abstract     = {The recently developed Sapflow+ method to determine sap flux density and sapwood water content necessitates a correct estimation of the heat generated by the heater needle. Even though this can theoretically be calculated based on the resistance of the heater and the applied voltage and current, in practice, however, these theoretical calculations overestimate the actual heat output due to probe limitations. Originally, the heater was therefore calibrated in a medium with known thermal characteristics, leading to an accurate correction factor. Elimination of this heat input from the model is, nevertheless, much more convenient as sensor specific calibration is labour-intensive and has to be conducted meticulously as the needle distances during calibration have to be equal to those applied during field measurements. Dividing the original equations is theoretically possible to eliminate the heat input, but has practical limitations. Adapting the equations and grouping heat input and volumetric heat capacity into a single parameter, however, enables in-situ estimations of heat input if a single measurement of dry wood density and water content is conducted. Our results show that, based on a single wood core measurement, the Sapflow+ sensor can be calibrated in-situ, pre-empting sensor specific calibration in a separate medium.},
  author       = {Vandegehuchte, Maurits and Steppe, Kathy},
  booktitle    = {Acta Horticulturae},
  editor       = {Steppe, Kathy},
  isbn         = {9789066055063},
  issn         = {0567-7572},
  language     = {eng},
  location     = {Ghent, Belgium},
  pages        = {93--100},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {Eliminating the heat input as parameter in the Sapflow+ method},
  url          = {http://www.actahort.org/books/991/991\_11.htm},
  volume       = {991},
  year         = {2013},
}

Chicago
Vandegehuchte, Maurits, and Kathy Steppe. 2013. “Eliminating the Heat Input as Parameter in the Sapflow+ Method.” In Acta Horticulturae, ed. Kathy Steppe, 991:93–100. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Vandegehuchte, Maurits, & Steppe, K. (2013). Eliminating the heat input as parameter in the Sapflow+ method. In Kathy Steppe (Ed.), Acta Horticulturae (Vol. 991, pp. 93–100). Presented at the 9th International workshop on Sap Flow, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Vandegehuchte M, Steppe K. Eliminating the heat input as parameter in the Sapflow+ method. In: Steppe K, editor. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2013. p. 93–100.
MLA
Vandegehuchte, Maurits, and Kathy Steppe. “Eliminating the Heat Input as Parameter in the Sapflow+ Method.” Acta Horticulturae. Ed. Kathy Steppe. Vol. 991. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2013. 93–100. Print.