It is to be noted that biogas
production is drastically reduced in cold climatic conditions, especially in
winter, due to a drop in ambient air temperature, which is much below an
optimum temperature of about 37℃
for
fermentation of slurry. Many methods, such as hot charging, passive/active for
slurry heating, have been tested, and it has been found that the passive
heating method is neither practical nor self-sustained. In order to make
bio-gas heating self-sustained, economical, and friendly to ecology and the
environment, a new approach of Bi-iSPVT has been adopted. Based on the finding,
we have made an attempt to analyze the system in terms of CO2 mitigation,
energy matrices, and environ- and exergo-economics to have a clean environment
and sustainable climate. An analysis has been performed by using embodied
energy, the annual overall thermal exergy of the system for ecological balance
for the good health of human beings. It has been found that an energy payback time
(EPBT) for a sustainable Bi-iSPVT system is about 1.67years, along with an exergo-economic
parameter (Rex) of 0.1016 kWh/
Keywords: Active heating, Bi-iSPVT, CO2 mitigation, Energy matrices, Energy payback time (EPBT).
