Temperature Influence and Heat Management Requirements of Microalgae Cultivation in Photobioreactors

Lingua: inglese

Editore: GRIN Verlag, GRIN Verlag Jul 2009, 2009

3640382250 / 9783640382255

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This item is printed on demand - Print on Demand Titel. Neuware -Master's Thesis from the year 2009 in the subject Agrarian Studies, grade: 1, California Polytechnic State University, language: English, abstract: Microalgae are considered one of the most promising feedstocks for biofuel production for the future. The most efficient way to produce vast amounts of algal biomass is the use of closed tubular photobioreactors (PBR). The heat requirement for a given system is a major concern since the best algae growth rates are obtained between 25-30 °C, depending on the specific strain. A procedure to determine temperature influence on algal growth rates was developed for a lab-scale PBR system using the species Chlorella. A maximum growth rate of 1.44 doublings per day at 29 °C (optimal temperature) was determined. In addition, a dynamic mathematical model was developed to simulate heating and cooling energy requirements of tubular PBRs for any desired location. Operating the model with hourly weather data as input, heating and cooling loads can be calculated early in the planning stage of a project. Furthermore, the model makes it possible to compare the operation inside a greenhouse to the outdoor operations, and consequently provides fundamental information for an economic feasibility study. The best configuration for a specific location can be evaluated easily. The model was exemplary tested for a hypothetical 100,000 l photobioreactor located in San Luis Obispo, California, U.S.A. Average algae productivity rates of 23% and 67% for outdoor and indoor PBR operations, respectively, were obtained. Actual energy loads (heating and cooling) needed to maintain the PBR at optimal temperature were determined and compared. Sensitivity analyses had been performed for abrupt temperature and solar radiation steps, PBR row distances, ground reflectivities, and ventilation rates of the greenhouse. An optimal row distance of 0.75 m was determined for the specific PBR. The least amount of energy was needed for a ground reflectivity of 20%. The ventilation rate had no major influence on the productivity rate of the system. Results demonstrated the importance of a simulation model as well as the economic impact of a sophisticated heat management system. Energy savings due to an optimized heat management system will eventually increase proficiency of the systems, which will support a new sustainable industry and future developmental potential. Keywords: Microalgae, photobioreactor, temperature influence, heat management, biodiesel, ethanol, biofuel, algal biomassBooks on Demand GmbH, Überseering 33, 22297 Hamburg 148 pp. Englisch.

Codice articolo 9783640382255

Titolo
Temperature Influence and Heat Management Requirements of Microalgae Cultivation in Photobioreactors
Autore
Thomas H. Mehlitz
Editore
GRIN Verlag, GRIN Verlag Jul 2009
Anno di pubblicazione
2009
Condizione
Neu
Rilegatura
Taschenbuch
Lingua
inglese
ISBN 10
3640382250
ISBN 13
9783640382255
Peso dell'articolo
225 grammi
Dimensioni
210x148x11 mm

buchversandmimpf2000

Emtmannsberg, BAYE, Germania

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