Journal of Fundamentals of Renewable Energy and Applications
Open Access
ISSN: 2090-4541
ISSN: 2090-4541
Grazia Leonzio
University of L��?Aquila, Italy
Posters & Accepted Abstracts: J Fundam Renewable Energy App
The energy consumption of refrigeration systems in food industry is growing due to the increasing production of food and the requirements imposed by quality, hygiene and food safety standards. In this research a sustainable and innovative refrigeration system for lattuge is developed, integrating biogas, trigeneration system and a refrigeration chambre that uses nozzles to spray cooling water to food. The cold produced by the generator of absorption heat pump, moved by biogas, is used to produce cooling water. A design of the system is carried out, developing a mathematical model for the deactivation of Escherichia Coli O157:H7 bacteria. The semi-logarithmic Weibull equation is used to describe the survival biphasic model. By current legislation the microbiological contamination limit for Escherichia coli is equal to 100 cfu/g; the temperature of refrigeration is set to 278 K. Two steps are present. During the non-isothermal process, decribed by Arrhenius kinetic, the initial temperature decreases from 303 K to 278 K. In 30 minuts the concentration of bacteria varies from 300 cfu/g to 241 cfu/g. The activation energy is equal to 85000 J/mol while the preexponential factor 2.5��?1011 s1. In the second isothermal step, described by Weibull model, 190 minutes are necessary to eliminate bacteria; the required cooling water flow rate is 190 kg/h while the pressure and volume are respectively equal to 0.5 bar and 50 m3. The energy saving respect to traditional system is equal to 30%. Future researches should be conducted about the enviromental analysis in order to have energetic and enviromental advantages of the integrated system.
Grazia Leonzio is currently a PhD student from L’Aquila University, Italy. She has published several articles and participated to several international and national congresses about environmental and energy aspect of chemical processes. She wrote an article about waste management in Italian regions and published in Columbia University website. She has participated to M.U.N conferences and she is a Member of several associations like A.I.D.I.C. (Italian Association of Chemical Engineering), S.C.I. (Italian Chemical Society), I.S.S.N.A.F. (Italian Scientists and Scholars in North America) and E.C.A.S. (European Commission Authentication Service). She is a Referee of several journals.