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The Repair And Maintenance Of A Faulty Deep Freezer
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Since
the refrigerant evaporates and condenses it is necessary that the
operation is cyclic. Over and over again the process is repeated in
order to produce more cooling. A refrigeration cycle is said to be
completed when the refrigerant has moved from a point round the
components and back to the starting point.
Worth of consideration is
the effect of pressure. It is a linear and positive relationship with
temperature, which is the basic property of transmission. An increase in
pressure of a body induces internal stress on the body. Also pressure
increase brings an increase in the heat capacity of a body. For
instance, and increase in the atmospheric pressure of water increase its
boiling point and vice versa. This explains the reason for refrigerant
to be sealed and circulated under pressure. We can rightly say that
pressure increase or decrease of a substance brings about increase or
decrease of the temperature on the substance respectively.
Nevertheless,
heat does not flow from a cool region to a hot one as in refrigeration
without work being done against the natural principle. This gives rise
to energy that is required which is artificially produced and at this
we talk of Deep Freezer.
Deep freezer: It is an electron –
mechanical appliance, which maintains the temperature of substance,
space or materials as required by the user i.e. it produces artificial
cooling. It operates on the principle of Reversed Carnot Cycle. That is
to say, I t absorbs heat from a low temperature and rejects it to a high
temperature region. The compressor provides the conversion of energy
that is used in circulating the refrigerant round the circuit.
The
crankshaft, which drives the piston though the connecting rod, is moved
by the torque produced by electric motor. The pumping effect of the
piston produces the high pressure on the refrigerant, which set it in
motion. In the cause of circulation and attendant change of state, the
refrigerant returns to the initial state and ready for another cycle.
In
a deep freezer, the condenser performs function similar to that of the
radiator in an automobile. It cools the hot refrigerant gas by giving
out heat to the surrounding and changing to liquid. The liquid is
delivered to the dryer, which traps moisture that can block the metering
device. The liquid refrigerant passes though the metering device
(capillar), which expands the liquid into the evaporator pipe, which is
of larger cross sectional area. The pipe is laid on the inside of the
Deep Freezer. A lot of insulation is done to isolate the refrigerated
space from the surrounding and its heating effect. One fact remains that
heat cannot be totally isolated from the refrigerated space. Yet it has
to be reduced to the barest minimum. Other modification and appliances
are put in place for convenience, efficiency and for security purposes.
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ABSRACT - [ Total Page(s): 1 ]Mechanical Engineering Department of the Institute of Management and Technology has many non – functional machines. This is caused as a result of poor maintenance culture, which in turn resulted to breakdown of the Deep Freezer under review.Quality and effectiveness of machine maintenance were observed. A minimized cost of maintenance and high Technology of repair were also adopted.In otherwords, during the repair and maintenance of the faulty Deep Freezer, appropriate tools, instrume ... Continue reading---
