Prediction of the gas emission from porous media with the concern of energy and environment

Abstract

Measuring soil carbon dioxide efflux is a challenging task even when it is performed using respiration chambers. While gas samples are taken, measurement deviations become more evident according to the used chamber design especially when external disturbances occur. This paper studies the carbon dioxide concentration profiles within the top soil layers, and investigates the controlling factors affecting the process. The considered factors are diffusion, temperature and viscosity. The efflux equation is discussed and then it is linked with the soils geotechnical parameters, while a relationship between the Reynolds number within the soil and efflux is found. Emphasis on the importance of the external geometrical design considerations is shown through studying external boundary layer effects due to the chamber outer shell shape and how it interacts with blowing winds. Chamber stability on site of deployment is also of a significant importance considering external blowing winds. Internal geometrical considerations are linked with the flow turbulence within the dynamic chambers. It is highly recommended that respiration chamber designers need to work in parallel with a multidisciplinary team in order to make a chamber design that ensures the least disturbance to occur at the location of study.

VSSAgri: A Vegetation Surveillance System for precision Agriculture application

“…A climate manager is very important in creating the ideal environment for the cultivation of the crops and a temperature and area manager to control the temperature and environment of the plants. In general, greenhouses can be divided into four categories: greenhouses in agricultural fields, underground greenhouses, photovoltaic agricultural greenhouses, and greenhouses integrated with building roofs [23]. Figure 4 shows the different types of closed greenhouses, with A quonset, B tri-penta, C dome, D gothic arch, E slant-leg, F a-frame, F half-pit, and G gable roof.…”