Petar Sabev Varbanov

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The sugarcane industry has been responsible in some countries for the production of most of the sugar and ethanol available in the world for internal and external markets. In this sector, ethanol can be produced by fermentation of sugars obtained directly from sugarcane biomass, commonly called 1 st generation ethanol. New processes using the enzymatic(More)
This contribution describes a new two-step solution strategy for the synthesis of heat-integrated process water networks (HIPWNs). The proposed strategy involves the solutions of two models. The first, nonlinear programming (NLP) model consists of a water network (WN) model and a simultaneous optimisation and heat integration model. The objective function(More)
This contribution presents a dynamic multi-objective synthesis of companies' supply-networks for improving companies' energy-supplies and environmental impacts by integrating renewables (biomass and other waste, and solar energy), based on Mixed-Integer Linear Programming (MILP). The previously developed model for achieving energy self-sufficiency by(More)
Keywords: Dynamic heat exchanger modelling Cell models Heat exchanger networks Controllability a b s t r a c t Large amounts of thermal energy are transferred between fluids for heating or cooling in industry as well as in the residential and service sectors. Typical examples are crude oil preheating, ethylene plants, pulp and paper plants, breweries,(More)
In line with human population growth, the demand for energy has increased drastically. As the world is soon facing the shortage of fossil fuels, production of biofuel from biomass has been identified as one of the most promising alternative renewable energy sources to support the energy demand. As biomass gasification can convert variety of biomass(More)
Fuel cells (FCs) are important for building combined energy systems due to their high efficiency. Molten Carbonate FCs (MCFC) and Solid Oxide FCs (SOFC) have been identified as best candidates for FC Combined Cycles (FCCC). This paper presents a procedure for evaluating the trends in emission levels and economics of FCCC based energy conversion systems,(More)
With the increasing trend of mobility of the human population, vehicles have to face the problem of primary energy resources scarcity. The vehicles need higher efficiency and better adaptation to the alternative energy sources. The need to improve the efficiency of the vehicle energy system motivates to search for innovative solutions during the design(More)
This paper presents a targeting strategy to solve the heat load distribution (HLD) problem for large-scale plant by dividing the system into subsystems while considering the heat transfer opportunities between them. The methodology is based on a sequential approach. The optimal flow rates of utilities are first defined using a Mixed Integer Linear(More)