By E E Khalil
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In symbolic form, this statement is D Dt ∫ sys e ρ dV = ∑Q − ∑Q D Dt . in ∫ sys out + sys ∑W − ∑W . 27a) sys . . 27b) sys The total stored energy per unit mass for each particle of mass in the system, e, is the summation of the internal energy per unit mass and the kinetic energy per unit mass and the potential energy per unit mass. 2 Differential Form The differential form is obtained by balancing all sources of energy, conduction, convection, shear work, and the internal heat generation/dissipation.
4 represents the rate at which the mass within the control volume is increasing, and the secondintegral represents the net rate at which mass is flowing out through the control surface (rate of mass outflow – rate of mass inflow). 4 is applied to an infinitesimal control volume. 1. At the center of the fluid density element is ρ and the velocity has components U, V, and W. 1 A differential element for the development of conservation of mass equation. The rate of mass flow through the surfaces of the element can be obtained by considering the flow in each of the coordinate directions separately.
2 Airflow Efficiency in Rooms The airflow regimes in the room can be viewed as carriers of energy, and the following efficiencies can be used. The thermal performance of airflow can be evaluated using two different indexes. These indexes indicate the heat removal efficiencies and the energy efficiency. 8 Square ceiling diffuser flow pattern and design. the performance of the airside design for air utilization in a confined room configuration. This index is proposed to evaluate the airside design, and the effectiveness of the extraction port(s) location.
Air distribution in buildings by E E Khalil