A light-modulated greenhouse control system

Bowman, G.E.; Weaving, G.S.

doi:10.1016/0021-8634(70)90121-6

Cited by 14 publications

(4 citation statements)

References 4 publications

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“…Some pioneering studies on climate control of greenhouse facilities started in the late 1960s [4], [5], [6]. However, before these studies were conducted, there were commercialized systems that controlled the environment inside the greenhouse by injecting artificial into the greenhouse.…”

Section: Greenhouse Multi-climate Control Technologymentioning

confidence: 99%

Data analysis of a multi-climate controller in tomato greenhouse production and the implications of ICT convergence: The TOMGRO model

Ahn¹,

Jung²,

Byeon³

et al. 2015

Advanced Science and Technology Letters

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This study tests a growth model of the greenhouse tomato by analyzing a set of data collected from a multi-climate control system, and suggests an application of the test results. The TOMGRO Model is used to examine the growth of tomatoes. The results show that the stem elongation rate is affected by mean air temperature and concentration. is 0.25, while the fit of the model is intermediate. There are two applications of this study. One application is to adjust the shipping date by utilizing wholesale market price data and predicting the growth of crops. The other application is to have a dashboard or smart phone available for the results of the model analysis.

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Section: Greenhouse Multi-climate Control Technologymentioning

confidence: 99%

Data analysis of a multi-climate controller in tomato greenhouse production and the implications of ICT convergence: The TOMGRO model

Ahn¹,

Jung²,

Byeon³

et al. 2015

Advanced Science and Technology Letters

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“…7 These automatically reset the desired value of air temperature in a predetermined manner as solar radiation increases. The results of two seasons' work offer considerable promise of increasing crop revenue with no increase in heating cost.…”

Section: Cropping Conditionsmentioning

confidence: 99%

Energy utilisation in the glasshouse industry

Sheard¹

1975

J Sci Food Agric

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The total annual energy consumption in Britain is about 9505 x lo9 MJ of which agriculture directly uses less than 1.4 % to produce over 50 % of the country's food. Of the agricultural consumption, glasshouse heating uses 35 %, or 900 000 tonnes, of fossil fuel annually. Heating costs account for about 30% of production costs of glasshouse crops. Boilers used on glasshouse holdings can operate at thermal efficiencies of 80-85 % with an overall system efficiency of at least 70%.Ways of increasing efficiency are discussed.Heat losses from glasshouses are high compared with other buildings due to the light-transmitting envelope but can be reduced by good maintenance, provision of windbreaks and the use of insulating covers drawn over the crop at night. Double skinning by lining with clear plastic film offers attractive fuel savings but the consequential light loss and crop reduction is likely to result in a net monetary loss. Research on crop response to temperature has established optimum temperature regimes for most crops. Reduction of temperature to save fuel usually results in a loss of crop and income which greatly exceeds the fuel saving. The use of light modulated temperature controllers offers promise of increasing the output from a given fuel input. The use of waste heat from electricity generation and industrial processes is unlikely to give any benefit in the near future.

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“…Other numerical simulation allow's to describe the effects of the coupling of many tubular heat exchangers on the cumulated thermal energy evolution which depends on thermal and physical properties of the heat storage soil, heat storage temperature and the heat exchanger design (Bowman. G. E et al [15] , Boulard. T et al [16] , Sanner.…”

Section: Introductionmentioning

confidence: 98%

Thermal Performance of a Solar Heat Storage Accumulator Used For Greenhouses Conditioning

Hazami¹,

Kooli²,

Lazaar³

et al. 2005

American J. of Environmental Sciences

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Abstract:The use of solar energy for greenhouse heating has gained an increasing acceptance during the last years. Active solar systems applied to greenhouses can supply a significant part of the heating requirements. However, there are some problems related to the cost of the heat collection unit and the heat storage methods. In this context several techniques were born. The most famous of these techniques is the seasonal storage of thermal heat in soil. The objective of our work is to study a system of thermal energy storage conceived in our Laboratory (LEPT, Tunisia). The system is composed of a vat having a large dimension (6 m 3 ) filled with fin sand. Inside the vat three batteries of capillary exchangers are buried at three different levels. To heat the accumulator soil, we use a solar collector with a surface equal to 6 m 2 . In order to size the heat accumulating system, a numerical study is started. It allows evaluating the soil temperature as well as the energy cumulated inside the accumulator during the charging and the discharging period.

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A light-modulated greenhouse control system

Cited by 14 publications

References 4 publications

Data analysis of a multi-climate controller in tomato greenhouse production and the implications of ICT convergence: The TOMGRO model

Data analysis of a multi-climate controller in tomato greenhouse production and the implications of ICT convergence: The TOMGRO model

Energy utilisation in the glasshouse industry

Thermal Performance of a Solar Heat Storage Accumulator Used For Greenhouses Conditioning

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