output characteristics of fuel cells are affected by a large number of parameters such as geometry, dimensions, construction materials and conditions of supplying fluids. in this paper a mathematical model followed by a two-dimensional numerical approach has been presented to study the fuel cell parametrically. effect of oxygen concentration at gas diffusion layer entrance, temperature and pres...

It is known that the share of influence microclimate on productivity animals about 20-25%. In process life, emit a large amount heat, moisture, harmful gases, including carbon dioxide, ammonia and hydrogen sulfide. If ventilation system does not work satisfactorily, concentration water vapor gases may exceed standards, as result which drastically reduce die. Currently, when creating livestock e...

This paper presents simulations of the integral coefficients of performance of a heat pump system coupled with a vertical ground heat exchanger (GHE). The GHE is simulated using different assumptions concerning the heat transfer in the ground, heat exchange between the ground and the brine and vertical variation of the brine temperature. The differences in the predicted performance coefficients...