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system$).$ Inis hot water is created through heat exchange from low pressure steam from the campus plant. This hot water supply pumped upwards to floor $3$ where it is circulated through fan coil units.

Sources of Steam and Water

Water enters the building through the mechanical joint ductile iron pipe $($connected to the building's exterior water supply$).$ From there, it branches into different systems. Steam enters through a the $2"$ and $3"$ Low Pressure Steam lines to create hot water.

Conversion Stages & Units

Steam from the external campus energy plant is used to heat water in HX$-1,$ condensate generated by the steam is then collected in the condensate receiver and returned via the pumped condensate return line $($PCR$)$ to be recycled.

How Heated Air is Transported

Exhaust air is drawn from the building's return air system and passes through a filter and exhaust fan. Before being released outdoors, the air passes through the energy recovery wheel where energy is transferred to or from the incoming outside air, depending on the season. For heating, the wheel recovers heat from warm exhaust air for transfer to new incoming fresh air. If the preconditioned air is still too cold, it passes through a heating coil, where it is heated using hot water. The energy recovery process can be bypassed.

Air within spaces is also recirculated through various fan coil units where air is heated by the coils supplied by the $4-$pipe hydronic loop.

$-$Where and how is air distributed vertically and horizontally

Heated fresh air is routed downwards vertically from the roof to all floor below where it is circulated into main spaces areas through ductwork consisting of various sizes. Fresh air is then recirculated through return grilles feeding fan coil units that reheat and redistribute hot air. Air is recirculated until eventually being pulled up through ductwork to MAU$-1$ to be exhausted outside.

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MacBook Pro

Problem $4(30$ points$)$

We are given the structure shown in Figure $3.$ Apart from the loadings, member $AB$ is also subjected to temperature effects. The cross$-$sectional depth of member $AB$ is $h=12in,$ and the thermal coefficient is $a_T=5*\frac{{10}^{-6}}{}F.$ We are also given that the effect of axial forces on the deformations can be NEGLECTED.

You are asked to calculate the counterclockwise rotation of point $A.$