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Architectural Analysis
Engineering Analysis
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Mechanical Systems - HVAC
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When the Rolla Library (originally a post office)
was construction, HVAC consisted of large windows for cooling
and wood or coal burning stoves for heating.
With later additions to the building central electrical
air conditioning and heating were added.
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Cost
The Rolla Library is faced with heavy airconditioning and heating
loads throughout the year. Due to the diverse weather experienced
in Missouri the Library has to be able to handle extreme heat and
cold. Therefore the cost of HVAC every year is high.
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Use of Building
The building experiences the most use in it's front entry area.
This area also has large windows which, although beautiful, not
help the heating and air conditioning problem in this area. The
rest of the building is used less and therefore required less
heating and air-conditioning.
Location of Building
Building location will obviously determine the systems used in
response to the climate of the region. In central Missouri there
is a large climate variance from 100ºC + in the summer to
below zero in the winter. With this range both a heating and cooling
element must be present in a building.
Expandability
Tying the present HVAC systems in the building with new systems
in the addition will be a challenge, but it is possible. The present
system will not be able to handle the needs of an addition so
a new system must be used.
Local Temperature Control
There are five separate HVAC systems each with its own thermostat.
However, due to the layout of the building and the position of
the thermostats there has been complaints about parts of the building
being hotter or colder than others. Hopefully, with upgraded systems
and new systems in the addition this problem will be fixed.
Noise
With the HVAC systems located on the roof and in the basement
noise is not a problem.
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Heating / Cooling Loads
Load will vary by time of year and section of the building. Summer
produces the largest loads. During spring and fall, the loads
should reach a minimum. Winter should bring higher heating loads
again.
Heating
Heating is done by heating elements in the HVAC systems which
heat air to be blown through the ducts throughout the building.
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Cooling
Cooling is accomplished through typical condensers located in
the HVAC systems. The liquid in the condensers is allowed to expand
as it travels through a series of coils on which air is blown
over. This causes the air to be cooled and then blown though the
ducts into the building.
Ventilation
Most of the building can be ventilated mechanically, by opening
widows.
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