PLANT GROWTH CABINET WITH HOT GAS BYPASS TEMPERATURE CONTROL

1969 ◽  
Vol 49 (1) ◽  
pp. 111-112 ◽  
Author(s):  
K. R. Scott
Keyword(s):  
Plant Growth ◽  
Temperature Control ◽  
Hot Gas

not available

scholarly journals Effect of Arbuscular Mycorrhiza and Temperature Control on Plant Growth, Yield, and Mineral Content of Tomato Plants Grown Hydroponically

HortScience ◽  
2013 ◽  
Vol 48 (12) ◽  
pp. 1470-1477 ◽  
Author(s):  
Martin Makgose Maboko ◽  
Isa Bertling ◽  
Christian Phillipus Du Plooy
Keyword(s):  
Plant Growth ◽  
Nutrient Uptake ◽  
Temperature Control ◽  
Mycorrhizal Fungi ◽  
Nutrient Concentration ◽  
Growth Yield ◽  
Mineral Nutrient ◽  
Nutrient Concentrations ◽  
Mineral Concentration ◽  
Temperature Controlled

Mycorrhizal inoculation improves nutrient uptake in a range of host plants. Insufficient nutrient uptake by plants grown hydroponically is of major environmental and economic concern. Tomato seedlings, therefore, were treated with a mycorrhizal inoculant (Mycoroot™) at transplanting to potentially enhance nutrient uptake by the plant. Then seedlings were transferred to either a temperature-controlled (TC) or a non-temperature-controlled (NTC) tunnel and maintained using the recommended (100%) or a reduced (75% and 50%) nutrient concentration. Plants grown in the NTC tunnel had significantly poorer plant growth, lower fruit mineral concentration, and lower yield compared with fruit from plants in the TC tunnel. Leaves from plants in the NTC tunnel had higher microelement concentrations than those in the TC tunnel. Highest yields were obtained from plants fertigated with 75% of the recommended nutrient concentration, and not from the 100% nutrient concentration. Application of arbuscular mycorrhizal fungi (AMF) neither enhanced plant growth, nor yield, nor fruit mineral nutrient concentrations. However, temperature control positively affected the fruit Mn and Zn concentration in the TC tunnel following AMF application.

Temperature control scheme using hot-gas bypass for a machine tool oil cooler

2018 ◽  
Vol 32 (3) ◽  
pp. 1391-1396 ◽  
Author(s):  
Wei-Ming Chiang ◽  
Win-Jet Luo ◽  
Fu-Jen Wang
Keyword(s):  
Machine Tool ◽  
Temperature Control ◽  
Hot Gas ◽  
Control Scheme ◽  
Oil Cooler

Interpretation and Analysis About Energy Savings in Commercial Green Houses Using Custom-Made Shadenets As Well As Thermal Reflective Screens

2017 ◽  
Author(s):  
Subin MattaraChalill ◽  
Chinnapalaniandi Periasamy ◽  
Pillai Nandakumar ◽  
Ram Karthikeyan
Keyword(s):  
Energy Consumption ◽  
Plant Growth ◽  
Temperature Control ◽  
Large Scale ◽  
Energy Savings ◽  
Microstructural Analysis ◽  
Climatic Conditions ◽  
Operational Cost ◽  
Active Radiation ◽  
Selection Of

Greenhouses are known to be the modern outlook for the agronomical industry in terms of high-end yield especially in the regions where climatic conditions are not stable like in the Middle East, Europe, and United States. Crop optimization is one of the major challenges facing the farmers and the controlled production centers can dictate this difficulty in the upcoming market. Greenhouses are considered as the high -tech production centers which can support the food industry to have a green revolution through the mass production of the vegetables and spices. Properly designed commercial greenhouses can increase the yield by minimizing the operational cost especially in terms of reducing the energy consumption. In order to have a properly designed greenhouse, the selection or up gradation of the shade structures can play a vital role. Conventional greenhouses are made of polycarbonate sheets and in some cases the polyhouses by using simple polyethylene sheets. In this scenario, the main drawbacks were the energy consumption, operational expenses and the effectiveness of the indoor temperature control. Custom designed shades based on the crop requirements can provide high production rate by reducing the energy consumption. The detailed microstructural analysis in conjunction with the photosynthesis demand can provide a better selection of the shade-net or curtains. Greenhouse shade structure can be upgraded using the motorized specially designed nets or by using thermal-reflective screens. This up gradation can provide four stage advantages. In stage one this can decrease the 50% of heat energy and which will save the HVAC operational cost. During the stage, two better temperature control during the day and night will provide a good environment to provide proper PAR (Photosynthetically Active Radiation)[5] for photosynthesis, in the wavelength range of 400 to 700 nanometer. Third and fourth stages are the protection from the frost as well heat stress during the different climatic conditions. In the present market condition, the commercial greenhouses are being built in large scale by neglecting the energy saving options in shade structures. The commercial greenhouses using the upgraded shade structures can save the operational cost by 25 to 30%. Selection of this shade-nets or curtains can be done using the detailed microstructural analysis of the material. Shade-nets/curtains can be controlled manually, mechanically or can be automated in large-scale greenhouses. Flowering dates in the plants can be accelerated using the shading materials and delayed by the use of control treatment, which coincides with the results obtained in the previous studies [1]. This has proven with high land experiments [2]. Greenhouse shade nets are used in order to protect crops and plants from adverse weather conditions, animals and pests, besides providing suitable conditions for plant growth. The essential performance properties required for greenhouse shade nets are the resistance to solar radiation and weathering. The intensity of the Photo Synthetically Active Radiation (PAR) directly influences plant growth. Other nonvisible radiations are ultraviolet (UV), infrared (IR) and far infrared (FIR)[16]. Polypropylene and polyester are more resistant to UV radiation than polyethylene, which is resistant to radiations in the visible region. The use of greenhouse shade nets in outdoor conditions also requires them to be resistant to abrasion[3]. The objective of the present work is to examine the effectiveness of the properly selected shade-net/curtain in commercial greenhouses in terms of high yield energy savings. This study was conducted to compare the traditional polycarbonate sheet with the innovation of properly designed shade curtain made-up from high-density polyethylene (HDPE) fiber reinforced material discover the best shading method for plant growth in an ideal energy conservation scenario. The study was conducted in the two identical greenhouses (planted with lettuce crop) located in Al Khawaneej farm in the Emirate of Dubai in the United Arab Emirates. Yield versus the energy consumption has been observed in a period of time and obtained the reduction in energy consummation of almost 20 to 30 %.

Characteristics of Temperature Control by Hot-gas Bypass Flow Rate on Industrial Water Cooler

2009 ◽  
Vol 33 (8) ◽  
pp. 1129-1136 ◽  
Author(s):  
Seung-Moon Baek ◽  
Jun-Hyuk Choi ◽  
Jong-Yeong Byun ◽  
Choon-Geun Moon ◽  
Ho-Saeng Lee ◽  
...  
Keyword(s):  
Temperature Control ◽  
Flow Rate ◽  
Industrial Water ◽  
Bypass Flow ◽  
Hot Gas ◽  
Water Cooler

scholarly journals Effects of Cycling in Temperature Control on Plant Growth

1972 ◽  
Vol 10 (4) ◽  
pp. 179-182
Author(s):  
Tsuyoshi MATSUI ◽  
Ichiro AIGA ◽  
Takeshi OMURA ◽  
Hikaru SATO
Keyword(s):  
Plant Growth ◽  
Temperature Control

scholarly journals The feasibility of external gas-assisted mold-temperature control for thin-wall injection molding

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401880610 ◽  
Author(s):  
Pham Son Minh ◽  
Thanh Trung Do ◽  
Tran Minh The Uyen
Keyword(s):  
Temperature Distribution ◽  
Injection Molding ◽  
Heating Rate ◽  
Temperature Control ◽  
Mold Temperature ◽  
Cavity Surface ◽  
Thin Wall ◽  
Mold Surface ◽  
Hot Gas ◽  
Wall Injection

Simulation and experimental testing were conducted on an external gas-assisted mold-temperature control combined with a pulsed cooling system used for thin-wall injection molding to determine its effect on the heating rate and temperature distribution of a mold surface. For mold heating via external gas-assisted mold-temperature control, a hot gas was directly discharged on the cavity surface. Based on the heat convection between the hot gas and the cavity surface, the cavity temperature rose to the target value. Practically, the gap between the heating surface and the gas gate is an important parameter as it strongly influences the heating process. Therefore, this parameter was analyzed under different values of plate-insert thickness herein. Heating was elucidated by the temperature distribution and heating-rate data detected by the infrared camera and sensors. Then, external gas-assisted mold-temperature control was applied for the thin-wall injection-molding part of 0.5 mm thickness with the local-gate-temperature control. The results show that with 300°C gas temperature, the heating rate could reach 9°C/s with a 0.5-mm stamp thickness and a 4-mm gas gap. The results show that with local heating at the melt-entrance area of the mold plate, the cavity was filled with a 20-s heating cycle.

Low-Temperature Fish Storage Facility with Precise Temperature Control

1969 ◽  
Vol 26 (1) ◽  
pp. 154-161
Author(s):  
K. R. Scott
Keyword(s):  
Steady State ◽  
Low Temperature ◽  
Temperature Control ◽  
Room Temperature ◽  
Storage Facility ◽  
Hot Gas ◽  
Long Term Storage ◽  
Straight Line ◽  
Term Storage

A coldroom complex recently installed at the Fisheries Research Board of Canada, Freshwater Institute laboratory at Winnipeg features several design aspects that are considered novel. These include foamed-in-place urethane insulation, two alternating R-502 refrigeration systems incorporating automatic safety switch-over and adjustable defrost, "straight-line" pneumatic temperature control, hot gas bypass control, and a master panel. The facility combines a cold laboratory at +2 C, a long-term storage room at −37 C, a small anteroom at −26 C, and a room containing eight 10.0-ft3 precise temperature cabinets at −40 C. Room temperature variation is ±0.25 degrees C during steady state conditions. Temperature rise during daily defrosting is less than 2 degrees C for a duration of 1 hr.

An LED Green Light for New Plant Growth Cabinet Precise Temperature Control System

2014 ◽  
Vol 577 ◽  
pp. 325-328
Author(s):  
Xing Li Wu ◽  
Jiang Lei Dong ◽  
Fan Liang ◽  
Shi Gang Cui ◽  
Li Guo Tian
Keyword(s):  
Control System ◽  
Plant Growth ◽  
Temperature Control ◽  
Control Device ◽  
Temperature Control System ◽  
Advantages And Disadvantages ◽  
Fresh Vegetables ◽  
Environment Temperature ◽  
The Impact ◽  
Temperature Control Device

In the current, people pay more attention on food nutrition and security issues. In some places, the lack of farming land and land pollution leads to serious problem that people could not eat fresh vegetables. In order to solve these problems, "LED smart plant growth cabinet "came into being. As temperature is one of the most important control parameter that has the impact on plant growth, this paper describes a new type of temperature control system, and proposes simple, stable, precise temperature control method. In this paper we propose a new original two-dimensional temperature control strategy, which makes this cabinet has advantage over other domestic products. This paper describes the relationship between environment temperature and plant growth, and illustrates how the temperature control device works. In the experiment, we evaluated the advantages and disadvantages of this temperature control device.

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