Energy consumption for plastic covered greenhouse structures

Abstract

In this paper different greenhouse structures were analyzed regarding energy consumption and energy productivity in winter lettuce production. Greenhouse production is still among most energy consuming branches in agriculture with very high investments and annually costs. This is the reason why plastic covering are introduced as mean of making this kind of plant production more efficient. Also, as a mean of lowering energy consumption, tunnel structures are proposed. Three different double plastic covered greenhouses were used for energy analysis. Two tunnel types, 9x 58m and 8 x 25m covered with double 180μm PE UV IR folia, and one gutter connected plastic covered greenhouse 7 x 39m. Inner folia was 50μm and outside folia was 180μm. Results show lowest energy consumption for gutter connected greenhouse. Energy out/in ration was also higher in gutter connected greenhouse. Highest energy consumptions was obtained in tunnel 8 x 25m.

Obzirom da je proizvodnja u zaštićenom prostoru grana poljoprivrede sa najvećom potrošnjom energije i najvišim godišnjim troškovima, proizvođačima se na tržištu nude različiti oblici konstrukcije, pre svega konstrukcije tunel tipa u varijantama sa jednostrukom i dvostrukom folijom, kao ekonomski i energetski najefikasniji. U radu su analizirani, sa aspekta potrošnje energije, najčešće korišćeni oblici konstrukcije objekata zaštićenog prostora na teritoriji Srbije. Dva objekta tunel tipa, 9 x 58 m i 8 x 25 m pokriveni dvostrukom 180μm PE UV IR folijom, i blok objekat sa dva broda 14 x 39 m pokriven dvostrukom folijom (unutrašnja 50μm, spoljašnja 180μm). Rezultati pokazuju da je najniža specifična potrošnja energije ostvarena u blok objektu. Stepen iskorišćenja energije je takođe bio viši kod blok objekta. Najviša specifična potrošnja energije ostvarena je u objektu tunel tipa 8 x 25 m.