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ISHS Acta Horticulturae 691: International Conference on Sustainable Greenhouse Systems - Greensys2004

ENERGY SAVING BY MODIFIED AND IMPROVED GREENHOUSE CONSTRUCTION AND CLIMATIC CONTROL STRATEGY

Authors:   N.E. Andersson, O. Skov
Keywords:   insulated footing, insulated vents, permanently insulated north wall, shading, Dendranthema grandiflora, KalanchoŽ blossfeldiana, Impatiens New Guinea-Hybrid, Pelargonium zonale, Schefflera actinophylla
DOI:   10.17660/ActaHortic.2005.691.63
Abstract:
In northern Europe greenhouses are built as multispan with single glass as cladding material and an energy saving screen. It is well known that screens reduce energy consumption in greenhouses. Investigations have shown that using non-transparent insulation material in the northern wall of the greenhouse without reduction in plant growth and development can save energy. A multispan greenhouse was designed where combination of different materials were used to obtain a greenhouse with a higher energy efficiency. The footing consisted of a 0.65 m high wall built of insulated building elements. The same material was used as cladding material for the whole northern wall. In the gables was used double acrylic and due to the large ratio of the vents area of the greenhouse roof the same double acrylic plate was used in the vents. The screen system consisted of rolling screens in the gables and southern wall and a double layer horizontal screen. Both screens were used for energy saving and by individual control for shading. The energy consumption and plant growth was compared with a multispan greenhouse with same dimension and age but clad with single glass and one layer of thermal screens. Using the same set point for controlling the greenhouse climate resulted in an energy saving by 30% in the energy optimised greenhouse and the plant production was equal in the two greenhouses. For further improvement in energy saving different climatic strategies were used. Controlling the energy saving screen by inlet temperature for the heating system resulted in an energy saving of more than 40%, but in some cases the quality of the plants were poorer while the production time was shorter.

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