Climate Control to Reduce Energy Inputs

Takakura, Taiki

doi:10.17660/actahortic.1989.245.54

Cited by 6 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Saving energy inputs to the greenhouse became an important research topic [19] . Sensible heat storage materials such as water, rocks, and soil came to be used for greenhouse heating.…”

Section: Energy Saving Techniquesmentioning

confidence: 99%

Research exploring greenhouse environment control over the last 50 years

Takakura

2019

International Journal of Agricultural and Biological Engineering

View full text Add to dashboard Cite

Environments do not exist in isolation. Their main components in greenhouse systems are plants. Without consideration of plants, analysis of greenhouse environments and environmental control of greenhouses can be accomplished, although it is not simple to achieve. Initial attempts were undertaken to analyze greenhouse environments and then reproduce them. Ventilation rate effects on plant photosynthesis in a growth chamber were reported in 1966. Computer simulations then became a main subject of research. The first dynamic computer simulation of a greenhouse environment including plants was published in 1971. According to innovations of computer technology, the use of minicomputers and microcomputers spread in many areas. By measuring the net photosynthesis of lettuce plants grown under artificial lighting, air temperature was optimized using a minicomputer with the hill-climbing method. The method was designated as the Speaking Plant Approach to environment control (SPA). After the author developed the first reported environmental control system in Japan, systems using microcomputers spread widely for greenhouse environmental control. Knowledge-based expert systems were tested for plant management. Also, a machine vision system was developed to detect critical moments for watering of muskmelon plants. The first feed-forward control method for greenhouses with a large heat mass was reported. Then space farming was tested in 1996 to assess gravity effects on plants. Energy-saving aspects such as solar sterilization, ground heat storage system, and storage using phase change material (PCM) have been reported. Defects of ordinary solarimeters were reported in 2008 along with an approach to estimate evapotranspiration in a greenhouse without the effect of so-called cosine law. Later, this technique was expanded to estimate photosynthesis of the plant canopy in a greenhouse using newly developed sensor units.

show abstract

“…Saving energy inputs to the greenhouse became an important research topic [19] . Sensible heat storage materials such as water, rocks, and soil came to be used for greenhouse heating.…”

Section: Energy Saving Techniquesmentioning

confidence: 99%

Research exploring greenhouse environment control over the last 50 years

Takakura

2019

International Journal of Agricultural and Biological Engineering

View full text Add to dashboard Cite

show abstract

“…Dynamic temperature control is a supplementary aspect to passive energy-saving techniques (thermal screens, double covers, alternative energy sources) for reducing energy inputs (Bailey, 1989;Takakura, 1989). The set point choice for heating and ventilation should optimize both energy saving and total yield.…”

Section: Introductionmentioning

confidence: 99%