Energy flow in a greenhouse equipped with glass raster lenses

Jirka, Vladimír; Kučeravý, Vladimír; Malý, Miroslav; Pech, František; Pokorný, Jan

doi:10.1016/s0960-1481(98)00247-x

Cited by 28 publications

(13 citation statements)

References 1 publication

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“…In the case of outdoor cultures, the sun light can be concentrated by light collector units (e.g., Fresnel lens) and distributed inside closed photobioreactors by means of focusing systems such as optical fibers and quartz tubes [25,43,57,62,72,73,74,75,76,77,78]. Figure 12.10 reports a detail of the SOLARGLASS TM system of Glaverbel Czech Ltd. [57,79,80] designed and constructed on a greenhouse. As a consequence of the sunlight concentration, the photobioreactor tubes were able to receive up to 7000 μE/m 2 ·s of irradiance for most of the daily cycle.…”

Section: Novel Photobioreactor Configurationsmentioning

confidence: 99%

Industrial Cultivation Systems for Intensive Production of Microalgae

Olivieri

Salatino

2013

Natural and Artificial Photosynthesis

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Section: Novel Photobioreactor Configurationsmentioning

confidence: 99%

Industrial Cultivation Systems for Intensive Production of Microalgae

Olivieri

Salatino

2013

Natural and Artificial Photosynthesis

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“…Based on a PBR prototype (Jirka et al 1999;Masojídek et al 2003), an experimental, two-stage PBR consisting of four units was constructed at the Centre for Biotechnology in Nové Hrady, Czech Republic (48.5°N,14.5°E). This PBR, with its south-facing orientation, was based on solar concentrators (linear Fresnel lenses) and designed to combine some features of both indoor and outdoor cultivation units, fulfilling the following features:…”

Section: Pbr Designmentioning

confidence: 99%

A two-stage solar photobioreactor for cultivation of microalgae based on solar concentrators

et al. 2008

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A novel two-stage experimental photobioreactor (PBR) with a total volume of 450 L and based uniquely on solar concentrators-linear Fresnel lenses-has been constructed and tested. Daily courses of irradiance, and also its distribution inside cultivation tubes, were studied in two unit types. The supra-high irradiance units in the 'roof' achieved a maximum summer value above 6 mmol photon m −2 s −1 , while irradiance in the vertical-facade units was lower than 'ambient'. In model cultivations, cultures of the cyanobacterium Arthrospira platensis were cultivated at much higher solar irradiances than those usually recorded outdoors in summer, indicating that this organism is resilient to high-irradiance (photoinhibition). Starting from a biomass density of 0.5 g L −1 at optimum temperature, the cultures grew exponentially. A two-stage cultivation process of the green microalga Haematococcus pluvialis was investigated with respect to correlations between photochemical activities and astaxanthin production. The culture was first grown in low-irradiance units, and then exposed to supra-high irradiance when the rate of astaxanthin production was 30-50% higher than in the culture exposed to 'ambient' irradiance. Within 4 days, the astaxanthin content reached 3% of dry weight, whereas under ambient irradiance the astaxanthin content was 25% lower.

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“…With the novel greenhouse design presented in Figure 1, cooling can be combined with energy supply. First developments applying linear Fresnell lenses where presented by Jirka et al (1999) and Tripanagnostopoulos et al (2004). Fraas et al (2001) presented an illumination system with glass fibres.…”

Section: Introductionmentioning

confidence: 99%

Solar Energy Delivering Greenhouse With an Integrated Nir Filter

Sonneveld¹,

Swinkels²,

Holterman³

et al. 2008

Acta Hortic.

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The scope of this investigation is the design and development of a new type of greenhouse with an integrated filter for rejecting near infrared radiation (NIR) and a solar energy delivery system. Cooled greenhouses are an important issue to cope with the combination of high global radiation and high outdoor temperatures. As a first measure, the spectral selective cover material, which prevents the entrance of NIR radiation, is investigated. The special spectral selective properties of these materials have to block up to 50% of the solar energy outside the greenhouse, which will reduce the needed cooling capacity. The second measure is the integration of a solar energy system. When the NIR reflecting coating is designed as a parabolic or circular shaped reflector integrated in the greenhouse, the reflected solar energy of a PhotoVoltaic (PV) cell in the focus point delivers electric energy. With a ray tracing computer program the geometry of the reflector was optimally designed with respect to the maximum power level. The PV cells mounted in the focal point require cooling due to the high heat load of the concentrated radiation (concentration factor of 30-40). The properties of different materials, Ge, GaSb, CIS and Si cells were investigated to find the optimal cell for this application. All parts are integrated in a greenhouse structure with a size of about 100m 2 .

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Energy flow in a greenhouse equipped with glass raster lenses

Cited by 28 publications

References 1 publication

Industrial Cultivation Systems for Intensive Production of Microalgae

Industrial Cultivation Systems for Intensive Production of Microalgae

A two-stage solar photobioreactor for cultivation of microalgae based on solar concentrators

Solar Energy Delivering Greenhouse With an Integrated Nir Filter

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