Articles

EFFECTS OF NATURAL VENTILATION RATE ON TEMPERATURE AND RELATIVE HUMIDITY IN A NATURALLY VENTILATED GREENHOUSE WITH HIGH PRESSURE FOGGING SYSTEM

Article number
1037_150
Pages
1127 – 1132
Language
English
Abstract
Effects of a high pressure (7 MPa) fogging system on inside dry-bulb (or air) and wet-bulb temperatures, relative humidity and ventilation rate as functions of vent configuration and weather conditions in a naturally ventilated greenhouse were studied experimentally during the summer.
Two combinations of roof and side vent openings were examined with only the roof vents fully open, or both roof and side vents fully open.
Two cooling methods were examined, namely natural ventilation (NV) and fogging combined with natural ventilation (FNV). A fog system was operated cyclically with a temperature difference between the inside dry-bulb and wet-bulb temperatures, when over 1°C it was operated, and when under 0.5°C it was stopped at 1 min intervals.
The measurements were carried out with a tomato crop when 2.0 plants m-2 density was achieved in the greenhouse.
The natural ventilation rate was continuously measured with sulphur hexafluoride (SF6) as the tracer gas.
When the roof and side vents were open, the ventilation rate was larger than when only the roof vents were open.
The inside dry-bulb and wet-bulb temperatures were decreased with increasing ventilation rate.
At all fogging times, the inside dry-bulb temperature sharply decreased, while the inside relative humidity sharply increased.
During the experiment, the differences between inside and outside dry-bulb temperatures, inside relative humidity and ventilation rate were 2.9°C, 55.2% and 3.6 m3 m-2 min-1 in NV, and -2.9°C, 88.2% and 2.3 m3 m-2 min-1 in FNV. Future work will develop a fogging and vent control method to reduce inside dry-bulb and relative humidity fluctuations in the greenhouse.

Publication
Authors
M. Ishii, L. Okushima, H. Moriyama, S. Sase, T. Takakura, M. Kacira
Keywords
greenhouse, natural ventilation, fog cooling, temperature, relative humidity
Full text
Online Articles (152)
L.F.M. Marcelis | F. Buwalda | J.A. Dieleman | T.A. Dueck | A. Elings | A. de Gelder | S. Hemming | F.L.K. Kempkes | T. Li | F. van Noort | P.H.B. de Visser
S. Hemming | S.L. Speetjens | D. Wang | J.R. Tsay
E.G.O.N. Janssen | L.T. Baart de la Faille | W.J.A. Lohman
Y. Ishigami | E. Goto | M. Watanabe | T. Takahashi | L. Okushima
Il-Hwan Seo | In-Bok Lee | Kyeong-Seok Kwon | Se-Joon Park
S. Hemming | H.F. de Zwart | G.L.A.M. Swinkels | H.J.J. Janssen
F. van der Helm | P. van Weel | J. Steenhuizen | F. de Zwart | A. de Gelder
F.J. Baptista | D. Briassoulis | C. Stanghellini | L.L. Silva | A.T. Balafoutis | A. Meyer-Aurich | A. Mistriotis
C.-T. Lin | Y. Ishigami | S. Hikosaka | E. Goto | C.-J. Ting | C.-C. Cheng
J.P. Moon | S.H. Lee | G.C. Kang | J.K. Kwon | Y.K. Kang | S.J. Lee | C.K. Kim | Y. Cho
Youngjung Kim | Siyoung Lee | Jonggoo Kim | Donghyeon Kang | Honggi Choi
Jong Gil Jeon | Yee Paek | Ill Hwan Cho | Hyung Kwon Kim | Namkyu Yun | Dong Geon Lee
V.D. Ngo | D.K. Ryu | S.W. Kang | S.O. Chung | S.U. Park | S.J. Kim | J.T. Park
A. Ito | H. Shimizu | R. Hiroki | H. Nakashima | J. Miyasaka | K. Ohdoi
E. Goto | Y. Ishigami | K. Kimura | K. Arai | K. Kashima | H. Nakajima | S. Maruyama
S. Hayashi | S. Yamamoto | S. Saito | Y. Ochiai | S. Tsubota | H. Inazumi
A. Ruíz-García | I.L. López-Cruz | A. Ramírez-Arias | E. Rico-Garcia
Ningyi Zhang | Lu Lin | Wenwen Li | Jingqing Shao | Yanbao Zhou | Gang Li | Weihong Luo
Doo-Gyung Moon | Kye-Man Cho | Chun-Hwan Kim | Ki-Cheol Seong | Daneil Son | Myeng-Whan Cho | In-Ho Yu | Hee-Ryong Ryu | Ill-Hwan Cho
C. Cirillo | R. Caputo | G. Raimondi | S. De Pascale
H.J. Kim | P. Singleton | J. Lichty | A. Kawabata
R. Salazar | L. Miranda | U. Schmidt | A. Rojano | I. Lopez
D.K. Ryu | S.W. Kang | V.D. Ngo | S.O. Chung | J.M. Choi | S.U. Park | S.J. Kim
J. Hanssens | T. De Swaef | K. Steppe | D. Pinxteren | H. Marien | L. Wittemans | J. Desmedt
M. Teitel | M. Garcia-Teruel | H. Alon | S. Gantz | J. Tanny | I. Esquira | M. Sofer | A. Levi | A. Schwartz | A. Antler
Chenwen Zhu | P. Unachak | J.R. Llera | D.B. Knoester | E.S. Runkle | Lihong Xu | E.D. Goodman
G. Vox | I. Blanco | G. Scarascia Mugnozza | E. Schettini | C. Bibbiani | C. Viola | C.A. Campiotti
J. Balendonck | A.A. Sapounas | F. Kempkes | E.A. van Os | R. van der Schoor | B.A.J. van Tuijl | L.C.P. Keizer
Y. Iwasaki | D. Ahn | S. Matsuo | H. Umeda | K. Yasuba | A. Nakano | M. Takaichi
N. Rigakis | N. Katsoulas | P. Belitsiotis | C. Kittas | T. Bartzanas
A. Rojano | R. Salazar | J. Flores | I. López | F. Rojano | T. Espinosa | U. Schmidt | I. Schuhe | L. Trujillo
S. Yamamoto | S. Hayashi | S. Saitoh | Y. Ochiai | S. Tsubota | Y. Takeshima | K. Imou | K. Saga
Dae Hyun Jung | Hak-Jin Kim | Won Kyung Kim | Gyeong Lee Choi | Chang Ik Kang
K. Takayama | R. Hirota | N. Takahashi | H. Nishina | S. Arima | K. Yamamoto | Y. Sakai | H. Okada
C. Marx | M. Schultz | K. Schymik | A. Krüger | T. Ripken | T. Rath
Hyo Gil Choi | Joon Kook Kwon | Kyoung Sub Park | Sun Yi Lee | B. Khoshimkhujaev | Nam Jun Kang | Byoung Yong Moon
H. Kurosaki | H. Ohmori | H. Hamamoto | Y. Iwasaki
H.S. Doo | H.J. Bae | S.J. Kim | S.I. Jeong | Y.J. Shin | C.H. Chung | T.H. Kwon | J.Y. Park | C.H. Hong
Sun Yi Lee | Joon Kook Kwon | Kyoung Sub Park | Hyo Gil Choi
N. Gruyer | M. Dorais | C. Bastien | N. Dassylva | G. Triffault-Bouchet
E.G. Choi | B.O. Jin | C.H. Kim | M.H. Kim | G.Y. Baek | B.E. Moon | S.Y. Lee | H.T. Kim
Daniel Son | Ki Cheol Seong | Chun Hwan Kim | Seong Cheol Kim | Chan Kyu Lim
E.G. Choi | C.H. Kim | G.Y. Beak | M.H. Kim | H.T. Kim | D.E. Kim | Y.C. Yoon
Y. Liao | Y. Takai | A. Kato | K. Suzuki | D. Zhuang | R. Ogasawara | T. Shimazu | E. Kawamoto | H. Fukui
R. Hiroki | H. Shimizu | A. Ito | H. Nakashima | J. Miyasaka | K. Ohdoi
G. Vox | E. Schettini | G. Scarascia Mugnozza | L. Tarricone | L. de Palma
G. Santagata | M. Malinconico | B. Immirzi | E. Schettini | G. Scarascia Mugnozza | G. Vox
B. Khoshimkhujaev | J.K. Kwon | K.S. Park | S.Y. Lee | H.G. Choi
T. Kuroyanagi | S. Matsuda | H. Kawashima | Y. Nagasaki
F. Rojano | J. Flores-Velázquez | F. Villarreal-Guerrero | A. Rojano
Il-Hwan Seo | In-bok Lee | J.P. Bitog | Rack-Woo Kim
J.C. Roy | J.B. Pouillard | T. Boulard | H. Fatnassi | A. Grisey
H. Fatnassi | T. Boulard | C. Poncet | T. Bartzanas | N. Katsoulas | M. Kacira
F. Rojano | J. Flores-Velázquez | F. Villarreal-Guerrero | A. Rojano
A. Ramírez-Arias | J. Pineda-Pineda | M. Gutiérrez | W. Ojeda-Bustamante
M. Albaho | B. Thomas | S. Isathali | P. George | D. Ghloum
Yu Zhang | Jin Sun | Shuhai Li | Sheng Shu | Shirong Guo
C. Kittas | N. Katsoulas | T. Bartzanas | M. Kacira | T. Boulard