Design a ventilation system, in a college campus, that serves two lecture classrooms, one teacher officeand one computer lab. It is a VAV system with multiple zones, and the AHU will re-circulate a part of return air and set at minimum outdoor air (except in economizer mode). Floor supply diffusers were selected for cooling the spaces with ceiling return grills. It is displacement ventilation with low supply velocity. All rooms are internal zones (no external walls or windows) Heating will not be needed. The teachers and students are moving around the campus with a total number of 200.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj