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This paper is focused on applications at remote locations in arid areas and the assumed water source is brackish water. In this concept the roof transmission is reduced as solar irradiation is absorbed by flowing water on a glass sheet covered by a top glass sheet. Fresh water is evaporated, condensed on the top glass and collected at the roof eaves. For the assessment of this concept compared to conventional, single glassed greenhouses extensive computer simulations and field experiments in Tunisia were performed. Considerably less extreme climate conditions were registered in an experimental greenhouse with roof desalination compared to a conventional house. The simulation inaccuracy was around 5% for the water demand and production. In a more general analysis various design cases including crop cultivation examples are simulated. A system integrated in 50% of the roof area of a widespan greenhouse has the capacity to cover the annual demand for a low canopy crop. A similar capacity for a high canopy crop requires asymmetrical roof design and desalination system in the whole roof area. Simulated yield reductions for these cases are 25 resp.18 % and seasonal fresh water storage is required. The yield problem could be solved with more light selective glass materials (NIR-absorption). Interesting future prospects are expected for electrochromic glasses with dynamic absorptance control. This could improve crop yields and eliminate the seasonal storage demand. Also of supposed future interest are concepts based on warmer water sources and combined water production for additional purposes like drinking water

Nyckelord

Greenhouses; Irrigation; Desalination; System Design

Publicerad i

Proceedings
2004, volym: 2004
Utgivare: International Solar Energy Society

SLU redaktörer

  • Jilar, Torbjörn

    • Institutionen för jordbrukets biosystem och teknologi, Sveriges lantbruksuniversitet

UKÄ forskningsämne

Trädgårdsvetenskap/hortikultur

Publikationens identifierare

  • ISBN: 91-631-4740-8

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/5115