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Process Descriptions are similar
to Mechanism Descriptions in organizational structure but
they differ in content. Whereas Mechanism Descriptions detail
the physical attributes of a mechanism. Process Descriptions
describe either the steps in the operation of a mechanism or
the steps of a conceptual process. In this video lecture, I will tell you how
to describe a mechanism and operation. Here's the model for
a general description of a process. Begin by introducing the mechanism
with a logical definition, then add extensions to provide
any needed theory or principles. Make sure you include only work
the leader needs for the purpose. Next, describe the purpose, function,
and operation of this mechanism. Finally, list the major steps of
the mechanism's operation in the order that they will be discussed. Let's consider the following example. Description of the process of the
operation of an air conditioning system. The audience for this description is a
general technical reader who does not have specific expertise in air conditioning
fluid mechanisms or thermodynamics. Begin by introducing the mechanism
with a logical definition. Then add extensions to provide
any needed theory or principles. >> An air conditioner
is a mechanical device used to refrigerate
a controlled environment. The air conditioner accomplishes this
refrigeration by transferring heat within the environment to an area
outside the environment. >> Next, describe the function and
the operation of the mechanism. >> The air conditioner transfers
heat by using a fluid refrigerant. This refrigerant is pumped through
the controlled environment and the outside area. At the same time, the refrigerant is cycled at strategic
points between liquid an vaporous states. This change in the state provides
the means for transferring thermal energy. >> You may want to list the primary
operational parts of the mechanism especially if they relay
directly to the process steps. In any case,
be sure to list the major steps of the mechanism operations in the order
in which they will be described. Choosing this order may not be easy. Ideally, the steps will follow
a logical timeline from the start to the finish of the process. However, in some cases such
as transactional, iterative, or branching processes,
that may not be possible. In such cases, you will have to describe
the process steps in the way that is that clearest to adhere and
the purpose at hand. >> The air conditioner's operation is
centered on four major components: the compressor, condenser coil,
expansion valve, and evaporator coil. The operation of the air conditioner
relates directly to these parts and includes the following steps: compression,
condensation, expansion, and evaporation. >> Treat such steps as
a separate subsection. Define each step of the process. Then extend those definitions as
necessary to address to the equipment, material or concepts involved. Be sure to tell your leader clearly
what happens in each step, and provide link and
transitions between the steps. Compression. Discuss compression in reasonable depth
for the audience and purpose at hand. First, define compression and then deal
with the equipment and concepts involved. Describe what happens
during the compression. And then show their relationship
with the next step condensation. >> Compression is a fluid-dynamics
process in which a given volume of refrigerant vapor is forced to
occupy a smaller volume of space. Compression occurs when
the compressor forces. Hot refrigerant vapor under pressure
into the compression chamber. The chamber is composed of a cylinder and
valve arrangement. The pistol draws refrigerant into
the cylinder through an intake valve, and the intake valve closes and the pistol pushes up into the cylinder,
compressing the refrigerant vapor. The vapor then exits through an exhaust
valve and enters the condenser coil, where the condensation step occurs. >> Then, you need to describe
condensation, expansion, and evaporation in much the same
way as we dealt with compression. The last part of the process description
briefly summarizes the process. And provides a sense of
finality to the paper. >> The operation of an air
conditioner involves four steps. First, the compressor pumps refrigerant
under pressure into the condenser coil. Here it is liquefied, giving up heat that is removed by a fan
circulating air over the condenser coil. The liquid refrigerant moves through
a close loop, through an expansion valve, and into the lower-pressure
evaporator coil. Here the refrigerant changes into a vapor, absorbing heat from air passing
over the evaporator coil. This air then cools
the controlled environment, While the refrigerant is drawn
back into the compressor. At this point the cycle is complete and
the process repeats.

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