Numerical investigation of energy losses in the environment for mesophilic mode of fermentation
DOI:
https://doi.org/10.31548/energiya2020.04.097Abstract
The article is devoted to the study of energy losses of a biogas reactor into the environment during the fermentation of biomass in the mesophilic temperature regime. The article considers the influence of the presence of the insulating layer of the biogas reactor and the ambient temperature on the amount of energy losses and the required energy to recover these losses depending on the volume of the biogas reactor. The developed mathematical model allows to estimate the intensity of energy losses to the environment taking into account the amount of contamination of the inner wall of the biogas reactor, ambient temperature, average wind speed for the reactor location, surface area of the biogas reactor and its volume, material from which the biogas reactor is made, insulating layer and its material, mode of movement and frequency of biomass mixing.
The following assumptions have been made for numerical studies: biomass fermentation takes place in the mesophilic temperature regime , biogas reactors with a volume of 50 to 200 liters, at ambient temperatures from to .
It has been established that the heat loss to the environment for different volumes of biogas reactors, regardless of the ambient temperature and the presence or absence of an insulating layer, is not linear.
Numerical research has shown that the use of an insulating layer of mineral wool with a thickness of 100 mm, depending on the volume of the biogas reactor and ambient temperature, reduces the amount of energy required to maintain the thermal regime by 55-63 times. Taking into account the amount of losses at the stage of design and manufacture of biogas reactors will reduce energy costs to maintain the required temperature, thereby increasing the profitability of the biogas plant.
Key words: heat loss, biogas plant, mesophilic regime, heat transfer, thermal resistance, energy efficiency
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