Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse

The effect of root zone cooling on tomato root density was investigated under a greenhouse structure at Malaysian Agricultural Research and Development Institute (MARDI). Heat tolerance tomato variety was grown in a tropical greenhouse with preinstalled buried cooling pipes to chill the root zone. T...

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Main Author:	Ho, Angelina Mei Yi
Format:	Thesis
Language:	English
Published:	2011
Subjects:	Greenhouse management - Malaysia Heat - Transmission - Malaysia
Online Access:	http://psasir.upm.edu.my/id/eprint/34030/1/FK%202012%201.pdf
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id	my-upm-ir.34030
record_format	uketd_dc
spelling	my-upm-ir.340302024-09-03T08:46:58Z Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse 2011-04 Ho, Angelina Mei Yi The effect of root zone cooling on tomato root density was investigated under a greenhouse structure at Malaysian Agricultural Research and Development Institute (MARDI). Heat tolerance tomato variety was grown in a tropical greenhouse with preinstalled buried cooling pipes to chill the root zone. The experiment was conducted in a Split Plot Design with 4 temperature treatments, 15'C, 20'C, 25'C and the control (with no cooling pipes installed, approximately 30'C). Each treatment has 3 replicates. The results revealed that cooling the root zone to 25'C, the optimum temperature of tomato root volume production, increased the root volume by 32% at 16 Weeks after Transplanting (WAT), 7% at 20 WAT and 3% at 24 WAT. The study also shows that most of the roots are concentrated on the top layer which is first 10cm below the surface of planting media. The thermal conductivity and thermal diffusivity of a planting media inside a tropical greenhouse was investigated and experimentally measured using the line heat source transient method. The apparatus used in this study was a modified thermal needle probe. The planting media used in this greenhouse was a combination of cocopeat: burnt rice husk: perlite with a ratio of 7:3:2 respectively. The thermal conductivity of cocopeat: burnt rice husk: perlite at a ratio of 7:3:2 with moisture content, 55.98% wet basis, and density, 0.08 g/cm' was 0.1164 w/m'C; and the thermal diffusivity was 1.1063 x 10-4m'/s. At higher moisture content, the thermal conductivity of the planting media was 0.1560 w/m'C; while the thermal diffusivity was 7.9029 x 10-4m'/s. Finally, a heat transfer analysis on the cooling system applied to the root zone was done. The effect of heat inside the greenhouse and the cooling effect from the pipes to the root zone temperature were studied. Calculations were done using a Solver for Principles of Heat Transfer. A heat transfer model was then developed to predict the root zone temperature using the conservation of energy concept where surface radiation heat transfer into the planting media is equals to the surface convection heat transfer of the chilled planting media. Greenhouse management - Malaysia Heat - Transmission - Malaysia 2011-04 Thesis http://psasir.upm.edu.my/id/eprint/34030/ http://psasir.upm.edu.my/id/eprint/34030/1/FK%202012%201.pdf text en public masters Universiti Putra Malaysia Greenhouse management - Malaysia Heat - Transmission - Malaysia Ahmad, Desa
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
advisor	Ahmad, Desa
topic	Greenhouse management - Malaysia Heat - Transmission - Malaysia
spellingShingle	Greenhouse management - Malaysia Heat - Transmission - Malaysia Ho, Angelina Mei Yi Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
description	The effect of root zone cooling on tomato root density was investigated under a greenhouse structure at Malaysian Agricultural Research and Development Institute (MARDI). Heat tolerance tomato variety was grown in a tropical greenhouse with preinstalled buried cooling pipes to chill the root zone. The experiment was conducted in a Split Plot Design with 4 temperature treatments, 15'C, 20'C, 25'C and the control (with no cooling pipes installed, approximately 30'C). Each treatment has 3 replicates. The results revealed that cooling the root zone to 25'C, the optimum temperature of tomato root volume production, increased the root volume by 32% at 16 Weeks after Transplanting (WAT), 7% at 20 WAT and 3% at 24 WAT. The study also shows that most of the roots are concentrated on the top layer which is first 10cm below the surface of planting media. The thermal conductivity and thermal diffusivity of a planting media inside a tropical greenhouse was investigated and experimentally measured using the line heat source transient method. The apparatus used in this study was a modified thermal needle probe. The planting media used in this greenhouse was a combination of cocopeat: burnt rice husk: perlite with a ratio of 7:3:2 respectively. The thermal conductivity of cocopeat: burnt rice husk: perlite at a ratio of 7:3:2 with moisture content, 55.98% wet basis, and density, 0.08 g/cm' was 0.1164 w/m'C; and the thermal diffusivity was 1.1063 x 10-4m'/s. At higher moisture content, the thermal conductivity of the planting media was 0.1560 w/m'C; while the thermal diffusivity was 7.9029 x 10-4m'/s. Finally, a heat transfer analysis on the cooling system applied to the root zone was done. The effect of heat inside the greenhouse and the cooling effect from the pipes to the root zone temperature were studied. Calculations were done using a Solver for Principles of Heat Transfer. A heat transfer model was then developed to predict the root zone temperature using the conservation of energy concept where surface radiation heat transfer into the planting media is equals to the surface convection heat transfer of the chilled planting media.
format	Thesis
qualification_level	Master's degree
author	Ho, Angelina Mei Yi
author_facet	Ho, Angelina Mei Yi
author_sort	Ho, Angelina Mei Yi
title	Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
title_short	Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
title_full	Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
title_fullStr	Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
title_full_unstemmed	Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
title_sort	heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse
granting_institution	Universiti Putra Malaysia
publishDate	2011
url	http://psasir.upm.edu.my/id/eprint/34030/1/FK%202012%201.pdf
_version_	1811767721986097152

Heat transfer analysis of tomato root zone temperature cooled by chilled water in tropical greenhouse

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