scholarly journals Minimization of Temperature Ranges between the Top and Bottom of an Air Flow Controlling Device through Hybrid Control in a Plant Factory

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Seung-Mi Moon ◽  
Sook-Youn Kwon ◽  
Jae-Hyun Lim
Keyword(s):  
Hybrid Control ◽  
Air Flow ◽  
Air Distribution ◽  
Efficient Operation ◽  
Growth Environment ◽  
Closed Type ◽  
Plant Factory ◽  
Temperature Ranges ◽  
The Difference ◽  
Air Circulation

To maintain the production timing, productivity, and product quality of plant factories, it is necessary to keep the growth environment uniform. A vertical multistage type of plant factory involves different levels of growing trays, which results in the problem of difference in temperature among vertically different locations. To address it, it is necessary to install air flow devices such as air flow fan and cooling/heating device at the proper locations in order to facilitate air circulation in the facility as well as develop a controlling technology for efficient operation. Accordingly, this study compares the temperature and air distribution within the space of a vertical multistage closed-type plant factory by controlling cooling/heating devices and air flow fans harmoniously by means of the specially designed testbed. The experiment results indicate that in the hybrid control of cooling and heating devices and air flow fans, the difference in temperature decreased by as much as 78.9% compared to that when only cooling and heating devices were operated; the air distribution was improved by as much as 63.4%.

Effects of air temperature and air flow rate control on the tipburn occurrence of leaf lettuce in a closed-type plant factory system

2013 ◽  
Vol 54 (4) ◽  
pp. 303-310 ◽  
Author(s):  
Jun Gu Lee ◽  
Chang Sun Choi ◽  
Yoon Ah Jang ◽  
Suk Woo Jang ◽  
Sang Gyu Lee ◽  
...  
Keyword(s):  
Air Temperature ◽  
Flow Rate ◽  
Rate Control ◽  
Air Flow ◽  
Air Flow Rate ◽  
Closed Type ◽  
Plant Factory ◽  
Flow Rate Control ◽  
Leaf Lettuce

IMPROVING THE DESIGN OF THE CHAMBER SEED MORDANT

2020 ◽  
Vol 36 (2) ◽  
pp. 75-85
Author(s):  
R.Z. Aкhunov ◽  
Keyword(s):  
Air Flow ◽  
Suspension Flow ◽  
Work Safety ◽  
Axial Fan ◽  
Excessive Pressure ◽  
Air Circulation

The article presents the modernization of the design of the universal seed mordant PSS-20 by installing an axial fan and air ducts for closed air circulation in the processing chamber, which will ensure the full use of the mordant, work safety and increase the productivity of cultivated crops. The main advantage of this design is that the seeds in the same plane as the suspension flow is affected by the air flow, which improves the penetration into the layer. Air ducts make it possible to reuse the suspension that has not settled on the seeds. This is achieved due to the closed lid design. During operation, the fan creates excessive pressure inside the seed stream and rarefaction outside, and so small drops of solution that have penetrated the seed stream are sucked in by the fan and re-fed into the stream.

scholarly journals Fill ventilation of heated corn grain

2020 ◽  
pp. 74-77
Author(s):  
Mikhail Gennadievich Zagoruyko ◽  
Sergey Anatolyevich Pavlov
Keyword(s):  
Experimental Data ◽  
Distribution System ◽  
Air Flow ◽  
Air Distribution ◽  
The Dead ◽  
Over Time ◽  
Corn Grain

The grain masses of the first and subsequent batches, the equivalent coefficient of the dead gap of the air distribution system are calculated, the expressions for calculating the air flow for these batches and the experimental data on the change in moisture and temperature of the grain over time are given.

Research on Some Novel Functional Azobenzene Derivatives with Alkyl Chains and Different Substituted Groups

2011 ◽  
Vol 474-476 ◽  
pp. 537-542
Author(s):  
Ti Feng Jiao ◽  
Xu Hui Li ◽  
Jing Xin Zhou ◽  
Yuan Yuan Xing ◽  
Jing Ren
Keyword(s):  
Alkyl Chain ◽  
Uv Light ◽  
Molecular Structures ◽  
Functional Material ◽  
Alkyl Chains ◽  
Temperature Ranges ◽  
The Difference ◽  
Structural Influence ◽  
Azobenzene Derivatives ◽  
Base Group

Two functional azobenzene derivatives with alkyl chains and different substituted groups have been synthesized and their photoisomerization have also been investigated. It has been found that depending on the alkyl chain and different substituted groups, the formed azobenzene derivatives showed different properties, indicating distinct regulation of molecular skeletons. UV and IR data confirmed commonly the characteristic absorption of alkyl chain and aromatic segments in molecular structures. Thermal analysis demonstrated that the structural influence of both compounds in different temperature ranges. The difference of thermal stability is mainly attributed to the formation of Schiff base group and different substituent groups in molecular structure. The photoisomerization of these compounds both in solution and in cast film can undergo trans-to-cis isomerization by UV light irradiation, depending on different substituted groups. The present results have demonstrated that the special properties of azobenzene derivatives can be effectively turned by modifying molecular structures of objective compounds with proper substituted groups, which show potential application in functional material field.

scholarly journals Flowering and Morphogenesis of Kalanchoe in Response to Quality and Intensity of Night Interruption Light

Plants ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 90
Author(s):  
Dong Kang ◽  
Hai Jeong ◽  
Yoo Park ◽  
Byoung Jeong
Keyword(s):  
Plant Height ◽  
White Light ◽  
Light Emitting ◽  
Short Day ◽  
Spad Value ◽  
Long Day ◽  
Closed Type ◽  
Significant Difference ◽  
Plant Factory ◽  
White Light Emitting Diodes

The effects of the quality and intensity of night interruption light (NIL) on the flowering and morphogenesis of kalanchoe (Kalanchoe blossfeldiana) ‘Lipstick’ and ‘Spain’ were investigated. Plants were raised in a closed-type plant factory under 250 μmol·m−2·s−1 PPFD white light emitting diodes (LEDs) with additional light treatments. These treatments were designated long day (LD, 16 h light, 8 h dark), short day (SD, 8 h light, 16 h dark), and SD with a 4 h night interruption (NI). The NIL was constructed from 10 μmol·m−2·s−1 or 20 μmol·m−2·s−1 PPFD blue (NI-B), red (NI-R), white (NI-W), or blue and white (NI-BW) LEDs. In ‘Spain’, the SPAD value, area and thickness of leaves and plant height increased in the NI treatment as compared to the SD treatment. In ‘Lipstick’, most morphogenetic characteristics in the NI treatment showed no significant difference to those in the SD treatment. For both cultivars, plants in SD were significantly shorter than those in other treatments. The flowering of Kalanchoe ‘Lipstick’ was not affected by the NIL quality, while Kalanchoe ‘Spain’ flowered when grown in SD and 10 μmol·m−2·s−1 PPFD NI-B. These results suggest that the NIL quality and intensity affect the morphogenesis and flowering of kalanchoe, and that different cultivars are affected differently. There is a need to further assess the effects of the NIL quality and intensity on the morphogenesis and flowering of short-day plants for practical NIL applications.

Air Flow Modelling of a Multi-Storey Office Building

2013 ◽  
Vol 361-363 ◽  
pp. 833-844
Author(s):  
Chong Jie Wang ◽  
Wei Wei Liu
Keyword(s):  
Temperature Distribution ◽  
Natural Ventilation ◽  
Air Flow ◽  
Comfort Level ◽  
Office Building ◽  
Temperature Stratification ◽  
Air Distribution ◽  
Flow Modelling ◽  
Ventilation Strategies

Indoor fresh air distribution, temperature stratification and temperature distribution are consider to be the essential indicators when comes to evaluation of the comfort level for internal ventilation environment, particularly for natural ventilated space as target office building. It can be identified that the targeting building has been well designed in the respect of natural ventilation strategies where both cross and stack strategies have been adopted, but it is also obvious that under combined buoyancy and wind driven mode alternative problems appears.

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