Articles
GREENHOUSE WITH AN INTEGRATED NIR FILTER AND A SOLAR COOLING SYSTEM
Article number
719_11
Pages
123 – 130
Language
English
Abstract
The scope of this paper is a new greenhouse design that incorporates both a filter for rejecting near infrared radiation (NIR) and a solar cooling system.
Cooled greenhouses are an important issue for the combination of high global radiation and high outdoor temperatures. As a first measure, this study prevents heat entering the greenhouse by applying a NIR-reflective cover material.
The special spectral selective properties of these materials will block up to 50% of the outside solar energy from entering the greenhouse, which will reduce the cooling capacity required.
The second measure is the introduction of a solar driven cooling system.
When the NIR reflecting coating is designed as a parabolic or circular shaped reflector integrated in the greenhouse, the reflected solar energy received by a PV cell at the focus delivers sufficient electric energy to drive a fan and pad cooling system. The excess energy can be used for desalination and/or energy supply.
Parameters related to typical climate conditions and energy flows are presented.
Cooled greenhouses are an important issue for the combination of high global radiation and high outdoor temperatures. As a first measure, this study prevents heat entering the greenhouse by applying a NIR-reflective cover material.
The special spectral selective properties of these materials will block up to 50% of the outside solar energy from entering the greenhouse, which will reduce the cooling capacity required.
The second measure is the introduction of a solar driven cooling system.
When the NIR reflecting coating is designed as a parabolic or circular shaped reflector integrated in the greenhouse, the reflected solar energy received by a PV cell at the focus delivers sufficient electric energy to drive a fan and pad cooling system. The excess energy can be used for desalination and/or energy supply.
Parameters related to typical climate conditions and energy flows are presented.
Publication
Authors
P.J. Sonneveld, G.L.A.M. Swinkels, F. Kempkes, J.B. Campen, G.P.A. Bot
Keywords
NIR selective covering, concentrated radiation, absorption cooling
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