Tag Archives: greenhouses

Analytical Studies of Energy Efficiency Development of the Greenhouses (Published)

The move towards a de-carbonised world, driven partly by climate science and partly by the business opportunities it offers, will need the promotion of environmentally friendly alternatives, if an acceptable stabilisation level of atmospheric carbon dioxide is to be achieved. The use of natural resoucses that have not any air pollution or greenhouse gases and provides comfortable coexistence of human, livestock, and plants. The greenhouses require air conditioning process to control their temperature and relative humidity to suit specific plants. To achieve this goal, a novel air humidifier and/or dehumidifier systems using mop fans had been designed and employed in an experimental greenhouse to evaluate its performance under a controlled environment. The mop fan help to reduce the energy consumption of the greenhouse whilst providing a pleasant environment for the plants inside the greenhouse. The system was designed taking into account the meteorological conditions, which affect the environment inside the greenhouse. The performance of the system was monitored over a period of time by measuring the temperature and relative humidity of the greenhouse. Results of the monitoring have shown that the system was able to provide comfortable conditions (temperatures of 16-26oC and relative humidity of 65%) suitable for the plants grown in the experimental greenhouse. This device enable to minimse the temperature variation and, hence, avoided the hazard of any sudden climatic change inside the greenhouse.

Keywords: Solar Energy, Solar Radiation, global radiation, greenhouses

Effect of Supplementary Cyan Light to Deep Red and Royal Blue Range Wavelength on the Cultivation of TAMARA F1 Pepper (Published)

This research was conducted to investigate effect of supplementary Cyan Light on growth characteristics of pepper. Three different light sources, cyan (500 nm), red (660 nm), royal blue (440 nm), in closed environmental condition are examined. For this purpose, a 3-section shelf was prepared including Tamara F1 type pepper seeds. Temperature, water, pH, electrical conductivity (EC), fertilizer and nutrient contents were controlled at requested value. First section was lighted 18 hours a day with composing 55% deep red, %25 royal blue and 20% cyan lights. Second section was lighted same hours with first section and, and second section was composed the 65% deep red and 35% royal blue lights. Same photosynthetic photon flux density (PPFD) of 360 µmol m-2s-1 was used at first and second section. The third section was lighted with sunlight in order to make a comparison with natural lighting. The experiment continued to the 55 days from seeding to harvest time. The experiment showed that; additional cyan effected on 28% more size (followed with fruit length) and 191% fruit weight. Also, there is no significant effect on plant trunk thickness and fruit number.

Keywords: Agriculture, Cyan light, LED lighting, LabVIEW, Pepper, greenhouses